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CN105245479B - The receiving handling method of leading symbol in physical frame - Google Patents

The receiving handling method of leading symbol in physical frame Download PDF

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Publication number
CN105245479B
CN105245479B CN201410326504.2A CN201410326504A CN105245479B CN 105245479 B CN105245479 B CN 105245479B CN 201410326504 A CN201410326504 A CN 201410326504A CN 105245479 B CN105245479 B CN 105245479B
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time domain
signal
received
symbol
signaling
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CN105245479A (en
Inventor
张文军
黄戈
邢观斌
徐洪亮
何大治
管云峰
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Priority to CN201410326504.2A priority Critical patent/CN105245479B/en
Priority to CN201611174459.9A priority patent/CN107222444B/en
Priority to CN201611186616.8A priority patent/CN106685880A/en
Priority to CN201611169449.6A priority patent/CN107070831A/en
Priority to CN201910172245.5A priority patent/CN109743278B/en
Priority to CN201611199976.1A priority patent/CN106998312B/en
Priority to PCT/CN2015/076814 priority patent/WO2015158295A1/en
Priority to CA2945858A priority patent/CA2945858C/en
Priority to KR1020197033488A priority patent/KR102191859B1/en
Priority to CA3212005A priority patent/CA3212005A1/en
Priority to KR1020207035510A priority patent/KR102234307B1/en
Priority to KR1020197038044A priority patent/KR102196222B1/en
Priority to KR1020167032057A priority patent/KR101975551B1/en
Priority to KR1020197012400A priority patent/KR102108291B1/en
Priority to CA2945857A priority patent/CA2945857C/en
Priority to CA2945854A priority patent/CA2945854A1/en
Priority to US15/304,853 priority patent/US10411929B2/en
Priority to US15/304,854 priority patent/US10778484B2/en
Priority to CA2945855A priority patent/CA2945855C/en
Priority to KR1020167032058A priority patent/KR102033742B1/en
Priority to KR1020167032059A priority patent/KR102062221B1/en
Priority to KR1020167032055A priority patent/KR102048221B1/en
Priority to KR1020167032043A priority patent/KR101974621B1/en
Priority to US15/304,857 priority patent/US10148476B2/en
Priority to PCT/CN2015/076808 priority patent/WO2015158292A1/en
Priority to PCT/CN2015/076812 priority patent/WO2015158293A1/en
Priority to PCT/CN2015/076813 priority patent/WO2015158294A1/en
Priority to US15/304,856 priority patent/US10574494B2/en
Priority to KR1020197018441A priority patent/KR102114352B1/en
Priority to US15/304,851 priority patent/US11071072B2/en
Priority to KR1020207014009A priority patent/KR102223654B1/en
Priority to CA3211647A priority patent/CA3211647A1/en
Priority to CA2945856A priority patent/CA2945856C/en
Priority to PCT/CN2015/076815 priority patent/WO2015158296A1/en
Priority to KR1020207036622A priority patent/KR102347011B1/en
Publication of CN105245479A publication Critical patent/CN105245479A/en
Priority to US16/172,662 priority patent/US11201770B2/en
Priority to US16/172,727 priority patent/US11025465B2/en
Application granted granted Critical
Publication of CN105245479B publication Critical patent/CN105245479B/en
Priority to US16/726,928 priority patent/US10958494B2/en
Priority to US16/726,927 priority patent/US11012275B2/en
Priority to US16/992,041 priority patent/US11088885B2/en
Priority to US16/992,039 priority patent/US11082274B2/en
Priority to US16/992,038 priority patent/US11088884B2/en
Priority to US16/992,040 priority patent/US11128504B2/en
Priority to US17/351,197 priority patent/US11799706B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The receiving handling method of leading symbol in a kind of physical frame, including being handled to obtain baseband signal to the digital signal received；Judge in the baseband signal with the presence or absence of the received leading symbol of expectation, wherein the received leading symbol of expectation is based on time-domain OFDM symbol, and front has the spatial structure of modulated signal with cyclic prefix, the rear part；In the case where above-mentioned judging result, which is, is, determines position of the leading symbol in physical frame and solve signaling information entrained by the leading symbol.The technical program solves in current DVB_T2 standard and other standards, and the problem of probability of failure occurs in leading symbol low complex degree receiving algorithm detection under complex frequency Selective Fading Channel.

Description

Method for receiving and processing preamble symbol in physical frame
Technical Field
The present invention relates to the field of wireless broadcast communication technologies, and in particular, to a method for receiving and processing preamble symbols in a physical frame.
Background
Generally, in order for a receiving end of an OFDM system to correctly demodulate data transmitted by a transmitting end, the OFDM system must implement accurate and reliable time synchronization between the transmitting end and the receiving end. Meanwhile, since the OFDM system is very sensitive to the carrier frequency offset, the receiving end of the OFDM system needs to provide an accurate and efficient carrier frequency spectrum estimation method to accurately estimate and correct the carrier frequency offset.
At present, a method for implementing time synchronization between a transmitting end and a receiving end in an OFDM system is basically implemented based on preamble symbols. The preamble symbol is a symbol sequence known to both the transmitting end and the receiving end of the OFDM system, and serves as the start of a physical frame (named P1 symbol), and only one P1 symbol or a plurality of P1 symbols occur consecutively in each physical frame, which marks the start of the physical frame. The P1 symbols have the following uses:
1) enabling a receiving end to quickly detect whether a signal transmitted in a channel is an expected received signal;
2) providing basic transmission parameters (such as FFT point number, frame type information and the like) so that a receiving end can perform subsequent receiving processing;
3) detecting initial carrier frequency offset and timing error, and compensating to achieve frequency and timing synchronization;
4) emergency alerts or broadcast system wake-up.
The DVB _ T2 standard provides a P1 symbol design based on a CAB time domain structure, and the functions are well realized. However, there are still some limitations on low complexity reception algorithms. For example, in a long multipath channel with 1024, 542, or 482 symbols, a large deviation occurs in timing coarse synchronization using the CAB structure, which results in an error in estimating the carrier integer multiple frequency offset in the frequency domain. Additionally, DBPSK differential decoding may also fail in complex frequency selective fading channels, such as long multipath. Moreover, since the DVB _ T2 has no cyclic prefix in the time domain structure, if the DVB _ T2 is combined with a frequency domain structure that needs to perform channel estimation, the performance of the frequency domain channel estimation is seriously degraded.
Disclosure of Invention
The invention solves the problem that the detection of preamble symbols in a low-complexity receiving algorithm under a complex frequency selective fading channel has failure probability in the current DVB _ T2 standard and other standards.
To solve the above problem, an embodiment of the present invention provides a method for receiving and processing preamble symbols in a physical frame, including the following steps: processing the received digital signal to obtain a baseband signal; judging whether a preamble symbol expected to be received exists in the baseband signal, wherein the preamble symbol expected to be received is a time domain OFDM symbol as a main body, and the front part of the preamble symbol is provided with a cyclic prefix and the rear part of the preamble symbol is provided with a time domain structure of a modulation signal; and if the judgment result is yes, determining the position of the preamble symbol in the physical frame and solving the signaling information carried by the preamble symbol.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
whether a preamble symbol expected to be received exists in a received baseband signal (obtained by processing a received physical frame), wherein the preamble symbol is mainly a time domain OFDM symbol, the front part of the preamble symbol has a cyclic prefix, and the rear part of the preamble symbol has a time domain structure of a modulation signal. And under the condition that the judgment result is yes, determining the position of the preamble symbol in the physical frame and decoding the signaling information carried by the preamble symbol, thereby decoding the information of the subsequent data frame according to the indication of the signaling information.
The structure of the modulation signal of the time domain OFDM symbol and the time domain OFDM symbol ensures that an obvious peak value can be obtained by utilizing delay correlation at a receiving end. Moreover, the modulation signal of the time domain OFDM symbol can avoid that a receiving end is subjected to continuous wave interference or single frequency interference, or a multipath channel with the same length as the modulation signal occurs, or a false detection peak value occurs when the length of a guard interval in the received signal is the same as the length of the modulation signal.
Further, the frequency domain OFDM symbol corresponding to the time domain OFDM symbol in the preamble symbol includes: the system comprises effective subcarriers and zero sequence subcarriers, wherein the zero sequence subcarriers are positioned on two sides of the effective subcarriers; the effective subcarriers include fixed sequence subcarriers and signaling sequence subcarriers, and the fixed sequence subcarriers and the signaling sequence subcarriers are arranged in a parity-staggered manner. Through the specific frequency domain structure design, the fixed sequence can be used as the pilot frequency in the physical frame, thereby facilitating the receiving end to decode and demodulate the preamble symbol in the received physical frame.
Drawings
FIG. 1 is a diagram illustrating a CAB structure of preamble symbols in a physical frame according to the present invention;
fig. 2 is a schematic diagram of a CAB structure of preamble symbols for transmitting signaling information according to the present invention;
fig. 3 is a flowchart illustrating a method for receiving and processing preamble symbols in a physical frame according to an embodiment of the present invention.
Detailed Description
The inventor finds that in the current DVB _ T2 standard and other standards, preamble symbols have the problem of low complexity receiving algorithm detection failure probability under complex frequency selective fading channels.
In view of the above problems, the inventors have studied and provided a method for receiving and processing preamble symbols in a physical frame. The method is based on the characteristic of the time domain waveform of the preamble symbol, and the structure of the modulation signal of the time domain OFDM symbol and the time domain OFDM symbol is utilized to ensure that an obvious peak value can be obtained at a receiving end by utilizing delay correlation. Moreover, the modulation signal of the time domain OFDM symbol can avoid that a receiving end is subjected to continuous wave interference or single frequency interference, or a multipath channel with the same length as the modulation signal occurs, or a false detection peak value occurs when the length of a guard interval in the received signal is the same as the length of the modulation signal.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic diagram illustrating a CAB structure of preamble symbols in a physical frame according to the present invention. Referring to fig. 1, a segment a represents a time domain OFDM symbol, a segment C represents a cyclic prefix, and a segment B represents a modulated signal.
The time domain OFDM symbol is obtained by the sending end after the frequency domain OFDM symbol is subjected to inverse discrete Fourier transform. For example, for P1_ XiObtaining a time domain OFDM symbol after performing inverse discrete Fourier transform:
wherein M is the number of effective non-zero subcarriers.
And intercepting the time domain OFDM symbol with the length of the cyclic prefix from the time domain OFDM symbol as the cyclic prefix, wherein the length of the cyclic prefix is equal to or less than the length of the time domain OFDM symbol. The determined cyclic prefix length is determined according to any one or more factors of the multi-path length which the wireless broadcast communication system usually needs to resist, the minimum length of a robust correlation peak value obtained by the system at the lowest receiving threshold and the number of bits of the time domain structure transmission signaling. If only the signaling needs to be transmitted in the frequency domain structure, and the time domain structure is fixed and no signaling needs to be transmitted, only one or two of the multipath length to be countered and the minimum length of the robust correlation peak obtained by the system at the lowest receiving threshold need to be considered. In general, the longer the length of the cyclic prefix, the better the performance against long multipath, and the longer the length of the cyclic prefix and the length of the modulated signal, the more robust the peak of its delay correlation. Generally, the length of the cyclic prefix and the length of the modulation signal are required to be greater than or equal to the minimum length of the robust correlation peak obtained by the system at the lowest receiving threshold.
And generating a modulation signal based on the intercepted time domain OFDM symbol with the cyclic prefix length.
In practical application, a frequency offset sequence may be set, and then the time domain OFDM symbol with the cyclic prefix length or a part of the time domain OFDM symbol with the cyclic prefix length is multiplied by the frequency offset sequence to obtain the modulation signal.
Let NcpFor determined cyclic prefix length, LenBIs the modulation signal length.
The frequency offset sequence isWherein f isSHMay be selected as the frequency domain subcarrier spacing (i.e., 1/N) corresponding to the time domain OFDM symbolAT), where T is the sampling period, NAIs the length of the time domain OFDM symbol. In this example, NAIs 1024, take fSH1/1024T. In other examples, to sharpen the correlation peak, fSHCan also be selected to be 1/(Len)BT). When LenB＝NCPWhen f is presentSH＝1/NCPAnd T. Such as LenB＝NCPWhen is 512, fSH＝1/512T。
In other embodiments, m (t) may also be designed into other sequences, such as an m-sequence or some simplified window sequence.
The modulation signal of the partial time domain OFDM symbol is P1_ b (t), P1_ b (t) is obtained by multiplying the partial time domain OFDM symbol by the frequency offset sequence m (t), i.e., P1_ b (t) is:
n1 is the sampling point number of the time domain OFDM symbol selected to be copied to the start of the modulation signal segment.
The modulation signal length is determined by the minimum length of the robust correlation peak that the system can obtain at the lowest receive threshold. Typically the modulation signal length is equal to or greater than the minimum length. Let NASetting the sampling point serial number of the time domain OFDM symbol as 0,1, … N for the length of the time domain OFDM symbolAAnd 1, setting N1 as the sampling point sequence number of the time domain OFDM symbol corresponding to the starting point selected to be copied to the modulation signal segment, and setting N2 as the sampling point sequence number of the time domain OFDM symbol corresponding to the end point selected to be copied to the modulation signal segment. Wherein,
N2＝N1+LenB-1
for convenience of description, the time domain OFDM symbol is divided into 2 parts, the first part is a part of the time domain OFDM symbol (generally, the front part of the time domain OFDM symbol) which is not truncated as a cyclic prefix, and the second part is a part of the time domain OFDM symbol (generally, the rear part of the time domain OFDM symbol) which is truncated as a cyclic prefix. If all the time domain OFDM symbols are intercepted as cyclic prefixes, the length of the first section is 0. N1 must fall within the second segment, i.e., the portion of the time domain OFDM symbol selected for the modulated signal segment does not span beyond the portion of the time domain OFDM symbol truncated as a cyclic prefix.
The modulation signal is only modulated by frequency offset or other signals, so that the correlation value of the modulation signal and the cyclic prefix and the correlation value of the modulation signal and the time domain OFDM symbol can be used for timing synchronization and small offset estimation. In practical applications, the modulated signal length typically does not exceed the length of the cyclic prefix portion. The modulation signal can avoid the receiving end from continuous wave interference or single frequency interference, or the occurrence of a multipath channel with the same length as the modulation signal, or the occurrence of a false detection peak when the length of a guard interval in the received signal is the same as the length of the modulation signal.
As shown in fig. 1, the cyclic prefix is spliced at the front of the time domain OFDM symbol as a guard interval, and the modulated signal is spliced at the rear of the OFDM symbol as a modulated frequency offset sequence to generate a preamble symbol of a CAB structure.
For example, the preamble symbol may be based on employing the time domain expression:
in a preferred embodiment, the predetermined length NA＝1024；NcpIs half of said predetermined length, i.e. when NAWhen is 1024, Ncp＝512。
Further, different cyclic prefixes and modulation signals are generated, so that finally formed preamble symbols are different, when a receiving end demodulates the preamble symbols in the received physical frame, delay correlation operation can be performed on the preamble symbols, different delays are set according to attempts, and only when delay values are matched with design parameters of the preamble symbols, an obvious correlation peak value can be obtained, so that different preamble symbols are distinguished, and the purpose of transmitting signaling information in a time domain structure in the preamble symbols is achieved.
The embodiment of the invention provides a method for intercepting a time domain OFDM symbol with a cyclic prefix length by selecting different initial positions in the time domain OFDM symbol for intercepting the time domain OFDM symbol with a modulation signal length to generate a modulation signal, so that a finally formed preamble symbol transmits signaling information through the different initial positions.
The transmitted signaling information is exemplified as an emergency alert or a broadcast system identity EAS _ flag.
For example, the time domain OFDM symbol has a length of 1024, NCPIs 512+ L, LenB512-L, the length of the whole preamble symbol is 2048, wherein the modulation frequency offset value fSH1/1024T, the emergency alert or broadcast system identity EAS _ flag is signaled by selecting a different starting position N1 for transmission of the 1-bit signaling.
If EAS _ flag is equal to 1, taking N1 as 512-L, i.e. N is equal toAAnd the corresponding sampling point with the serial number of 512-L to 1023-2L of the OFDM symbol of 1024 generates B after modulating the frequency offset sequence, and the B is placed at the rear part of A.
If EAS _ flag is equal to 0, N1 is equal to 512+ L, i.e. N is equal toAAnd the corresponding sampling point with the serial number of 512+ L-1023 of the 1024 OFDM symbol generates B after modulating the frequency offset sequence, and the B is placed at the rear part of A.
Referring to fig. 2, another CAB structure for transmitting a preamble symbol of an emergency alert or broadcast system flag EAS _ flag is shown. Wherein the value of L is 8.
The time domain expression is:
if EAS _ flag is 1
If EAS _ flag is equal to 0
As another example, the predetermined length is 1024, NCPIs 512+ 15L, LenBFor 512, N1 may take 512+ i × L, and i is greater than or equal to 0 and less than 16, which may indicate 16 different fetching methods for transmitting 4-bit signaling information. For example, different transmitters may transmit their corresponding identification TXID by taking a different N1, the same transmitter may also transmit transmission parameters by changing N1 in time. Preferably, L is 16.
As another example, the predetermined length is 1024, NCPIs 512+ 7L, LenBFor 512, N1 can take 512+ i L, i is more than or equal to 0 and less than 7, and 3bit signaling information is transmitted. Preferably, L is 16.
The above is the generation method of the preamble symbol and the characteristic of the preamble symbol of the CAB structure in the embodiment of the present invention. At the receiving end, the characteristics of the preamble symbol can be used to determine whether a received baseband signal (obtained by processing the received physical frame) has a signal expected to be received, and if the determination result is yes, the position of the preamble symbol in the physical frame is determined and the signaling information carried by the preamble symbol is decoded, so as to decode the information of the subsequent data frame according to the indication of the signaling information.
Fig. 3 is a flowchart illustrating a specific embodiment of a method for receiving and processing preamble symbols in a physical frame according to the present invention. Referring to fig. 3, the reception processing method includes the steps of:
step S11: processing the received physical frame to obtain a baseband signal;
step S12: judging whether a preamble symbol expected to be received exists in the baseband signal, wherein the preamble symbol expected to be received is a time domain OFDM symbol as a main body, and the front part of the preamble symbol is provided with a cyclic prefix and the rear part of the preamble symbol is provided with a time domain structure of a modulation signal;
step S13: and if the judgment result is yes, determining the position of the preamble symbol in the physical frame and solving the signaling information carried by the preamble symbol.
As described in step S11, the received physical frame is processed to obtain a baseband signal. Generally, a signal received by a receiving end is an analog signal, and therefore, it is necessary to perform analog-to-digital conversion on the signal to obtain a digital signal, and then perform processing such as filtering and down-sampling on the digital signal to obtain a baseband signal. If the receiving end receives the intermediate frequency signal, the receiving end needs to perform spectrum shifting after performing analog-to-digital conversion on the intermediate frequency signal, and then performs processing such as filtering and down-sampling to obtain a baseband signal.
In step S12, it is determined whether there is a preamble symbol expected to be received in the baseband signal, wherein the preamble symbol expected to be received is a time domain OFDM symbol as a main body, and has a time domain structure with a cyclic prefix at the front part and a modulated signal at the rear part.
Specifically, first, the receiving end determines whether there is a preamble symbol expected to be received in the received baseband signal, i.e., whether the received signal conforms to the receiving standard, for example, the receiving end needs to receive data of the DVB _ T2 standard, and then needs to determine whether the received signal is based on the DVB _ T2 standard (e.g., whether there is a preamble symbol in the DVB _ T2 format in a physical frame).
In this embodiment, the determining whether the preamble symbol expected to be received exists in the baseband signal includes the following steps:
step S12A: according to the delay relationship and the modulation frequency offset relationship between each two of a cyclic prefix, a time domain OFDM symbol and a modulation signal in a preamble symbol expected to be received, performing delay sliding correlation and demodulation frequency offset on a baseband signal to obtain three delay correlation accumulated values;
step S12B: performing mathematical operation based on one, two or three of the three delay correlation accumulated values, and performing peak detection on an absolute value of a result of the mathematical operation;
step S12C: and if the peak detection result meets a preset condition, determining that the expected received signal exists in the baseband signal.
Specifically, referring to the above embodiment, the time domain expression of the preamble symbol is:
wherein N isAIs the length of the time domain OFDM symbol, NcpFor the length of the cyclic prefix, N1 is the sampling point number of the time domain OFDM symbol selected to be copied to the start of the modulation signal segment. Such as NAWhen is 1024, Ncp＝520，LenBN1 is 504 or 520, 504.
Since the preamble symbol desired to be received is a time domain OFDM symbol as a main body, the front part thereof has a cyclic prefix and the rear part thereof has a time domain structure of a modulated signal. Then the received signal, if it contains the desired preamble symbol, contains one or more multipaths each having the structure described above.
Based on the delay relation between the cyclic prefix and the time domain OFDM symbol, the received signal is subjected to delay sliding correlation, and the delay correlation expression U is1(n) and delay correlation accumulated value U1' (n) is as follows:
U1(n)＝r(n)r*(n-NA)
can select the U pair1' (n) is carried outNormalizing the energy to obtain U1s'(n)。
Namely, it is
Based on the delay relation and modulation frequency offset value between the modulation signal and the cyclic prefix, the received signal is delayed slide-correlated and the frequency offset is demodulated, and attention is paid to the delay correlation expression U2(n) and delay correlation accumulated value U2' (n) is as follows:
also can select the pair U2' (n) normalizing the energy to obtain U2s'(n)。
Based on the delay relation between the modulation signal and the time domain OFDM symbol and the modulation frequency offset value, the delay sliding correlation is carried out on the received signal, and the delay correlation expression U is expressed3(n) and delay correlation accumulated value U3' (n) is as follows:
also can select the pair U3' (n) normalizing the energy to obtain U3s'(n)。
Wherein corr _ len can take 1/fSHT to avoid continuous wave interference or LenBSo as to make the peakThe value is sharp.
Using delayed correlation accumulation values U1'(n)、U2'(n)、U3' (n) performing mathematical operations, e.g. U2'(n)·U3' (n), or U1'(n-NA+N1)·U2'(n)·U3'*And (n) acquiring the preamble symbol, and judging whether the baseband signal has the expected received signal.
E.g. NA＝1024，Ncp＝520，LenB504, 520, N1,
delaying a received signal by 1024 sampling points to perform sliding correlation on the received signal to obtain a first delay correlation accumulated value;
carrying out sliding correlation on 1528 sampling points of the received signal delay and the received signal after frequency offset demodulation to obtain a second delay correlation accumulated value;
and delaying the received signal by 504 sampling points and performing sliding correlation on the received signal after demodulation frequency offset to obtain a third delay correlation accumulated value.
And as such NA＝1024，Ncp＝512，LenB512, N1,
delaying a received signal by 1024 sampling points to perform sliding correlation on the received signal to obtain a first delay correlation accumulated value;
delaying the received signal by 1536 sampling points and performing sliding correlation on the received signal after frequency offset demodulation to obtain a second delay correlation accumulated value;
and delaying the received signal by 512 sampling points and performing sliding correlation on the received signal after demodulation frequency offset to obtain a third delay correlation accumulated value.
When a preamble symbol occurs, U2'(n)·U3'*(n) or U1'(n-NA+N1)·U2'(n)·U3'*The absolute value of (n) will peak. Thus can pass through the pair U2'(n)·U3'*(n) or U1'(n-NA+N1)·U2'(n)·U3'*(n) or U after energy normalization2s'(n)·U3s'*(n) or U1s'(n-NA+N1)·U2s'(n)·U3s'*And (n) adopting various peak detection algorithms to judge whether the expected received signal exists in the baseband signal. And if the peak value detection result meets a preset condition, determining that the pilot symbol expected to be received and the signal expected to be received exist in the baseband signal. For example, the peak maximum value is compared with a fixed threshold, if the peak maximum value exceeds the threshold, the preamble symbol and signal expected to be received exist, otherwise, the peak maximum value does not exist.
The determining the position of the preamble symbol in the physical frame in step S12 includes: the position of the preamble symbol in the physical frame is determined based on the result of peak detection satisfying a preset condition.
Specifically, if there is a preamble symbol expected to be received, the position of the preamble symbol in the physical frame is determined according to the part of the value or the maximum value where the peak value is large.
Fractional frequency offset estimation can also be carried out by using the peak value detection result, and the fractional frequency offset estimation can be obtained by weighting the value calculated by the following 2 methods by taking the peak value.
The method comprises the following steps:
wherein N isfThe point number with large peak value participating in statistics shows how many points on the peak value are taken to participate in calculation, and the calculation can also be carried out by taking the maximum value.
The method 2 comprises the following steps:
wherein k is equal to U1' (k) the point where the absolute value is maximum.
Further, since the transmitting end can use N1 (i.e. different starting positions in the time domain OFDM symbol intercepting the length of the modulation signal) to transmit signaling information, the expected received preamble symbol has the following characteristics:
1) intercepting a time domain OFDM symbol with a cyclic prefix length from the time domain OFDM symbol as a cyclic prefix;
2) generating a modulation signal based on the intercepted time domain OFDM symbol with the cyclic prefix length;
the OFDM signal transmission method comprises the steps that in a time domain OFDM symbol for intercepting a cyclic prefix length, different initial positions are selected to intercept the time domain OFDM symbol with a modulation signal length to generate a modulation signal, so that a finally formed preamble symbol transmits signaling information through the different initial positions;
in this case, based on different starting positions, several different delay relationships between the modulation signal and the cyclic prefix and between the modulation signal and the time domain OFDM symbol are generated, so as to determine whether there is a preamble symbol expected to be received in the baseband signal. And if the judgment result is yes, determining the position of the preamble symbol in the physical frame.
According to the delay relations between a plurality of different modulation signals and cyclic prefixes and between the modulation signals and time domain OFDM symbols, further obtaining a plurality of delay related accumulated value groups, wherein each group comprises delay sliding correlation and demodulation frequency deviation of the baseband signals according to the delay relations and modulation frequency deviation relations between every two of the cyclic prefixes, the time domain OFDM symbols and the modulation signals in the expected received preamble symbols, so as to obtain three delay related accumulated values;
computing one, two or three delay correlation accumulated values in each delay correlation accumulated value group, and carrying out peak value detection on the absolute value of the multiplication result;
and if the result of one group of peak value detection meets a preset condition, determining that the pilot symbol expected to be received exists in the baseband signal.
For example, when the preamble symbols use different N1 to transmit Q-bit signaling, the delay sliding correlation with N1 defined as a fixed value is a group. Each group containing the 3 delay-correlated accumulated values described above. Receiving end simultaneous 2QThe delay correlation set above for different values of N1, then from 2QEach U2'(n)·U3'*(n) or U1'(n-NA+N1)·U2'(n)·U3'*In the absolute value of (n), it is determined whether or not a desired preamble symbol exists.
If none of the absolute values exceeds the threshold, it indicates that the desired received signal is not present in the baseband signal. For example, when N1 is 504 or 520 is used to transmit a 1-bit emergency alert or broadcast system identifier, where N1-520 is denoted as a normal preamble symbol and N1-504 is denoted as an emergency alert or broadcast system, the above-mentioned delay correlation group of 2 groups is performed.
The group with the emergency alert broadcast flag 0, i.e., N1-520, is taken
Delaying a received signal by 1024 sampling points to perform sliding correlation on the received signal;
1528 sampling points of the received signal delay are in sliding correlation with the received signal after frequency offset demodulation;
the received signal delays 504 sampling points and carries out sliding correlation on the received signal after frequency offset demodulation;
the group with the emergency alert broadcast flag 1, i.e., N1 ═ 504, takes
The received signal is delayed by 1024 sampling points and is subjected to sliding correlation with the received signal after frequency offset demodulation;
carrying out sliding correlation on the received signal subjected to frequency offset demodulation by 1544 sampling points;
the received signal is delayed by 520 sampling points and is subjected to sliding correlation with the received signal after frequency offset demodulation. If the set of maximum values N1-520 exceeds the threshold, indicating that the baseband signal is the desired signal and the preamble symbol is present, EAS _ flag is 0; conversely, if the set of maximum values of N1-504 exceeds the threshold, it indicates that EAS _ flag-1; if none of the 2 sets exceeds the threshold, it indicates that the baseband signal is not the desired signal.
The decoding of the signaling information carried by the preamble symbol in step S13 includes the following steps: and solving signaling information carried by the preamble symbol by using all or part of the time domain waveform of the preamble symbol and/or a frequency domain signal obtained by performing Fourier transform on all or part of the time domain waveform of the preamble symbol.
Specifically, in this step, since the sending end may use N1 (i.e., different starting positions in the time domain OFDM symbol where the modulation signal length is truncated) to transmit the signaling information, the sending end may also use the signaling sequence subcarriers in the frequency domain OFDM symbol corresponding to the time domain OFDM symbol to transmit the signaling information. Therefore, the receiving end will correspondingly solve the signaling information based on the two different signaling information transmission modes, and the specific implementation process is as follows:
the transmitting end utilizes N1 to transmit signaling information:
as described above, the receiving end can solve the signaling information carried by the preamble symbol according to the condition that the determination result is yes. If the result of the peak detection of a certain group meets the preset condition, the signaling corresponding to the initial position of the modulation signal segment corresponding to the group is the transmission signaling.
The transmitting terminal transmits signaling information by using the signaling sequence subcarrier in the frequency domain OFDM symbol corresponding to the time domain OFDM symbol:
specifically, the frequency domain OFDM symbol corresponding to the time domain OFDM symbol includes: the system comprises effective subcarriers and zero sequence subcarriers, wherein the zero sequence subcarriers are positioned on two sides of the effective subcarriers; the effective subcarriers include fixed sequence subcarriers and signaling sequence subcarriers, and the fixed sequence subcarriers and the signaling sequence subcarriers are arranged in a parity-staggered manner. That is, the fixed sequence is filled to the position of even subcarrier (or odd subcarrier), and correspondingly, the signaling sequence is filled to the position of odd subcarrier (or even subcarrier), thereby the distribution state of the parity staggered arrangement of the fixed sequence and the signaling sequence is presented on the effective subcarrier of the frequency domain. When the lengths of the fixed sequence and the signaling sequence are not consistent, the parity staggering arrangement of the fixed sequence and the signaling sequence can be realized by a zero padding sequence subcarrier mode.
The signaling sequence and the fixed sequence may be generated by: and selecting a fixed sequence from all the selectable fixed sequences, generating a signaling sequence set with good autocorrelation and cross-correlation, and enabling an OFDM symbol formed based on any signaling sequence in the fixed sequence and the signaling sequence set to meet the required power peak-to-average ratio after being subjected to inverse Fourier transform.
In a particular embodiment, the first and second electrodes are,
the fixed sequence has a length of 353 and an amplitude of 1, as represented by:
wherein, ω isnThe values of (A) are arranged in rows from left to right in sequence as shown in the following table:
the number of the signaling sequences is 512, the signaling sequence set comprises 4 signaling sequence subsets, each signaling sequence subset comprises 128 signaling sequences, and the length L of each signaling sequence is 353.
The method for generating the signaling sequence comprises the following steps:
number of cyclically shifted bits (q)i,ki,i＝0～2N-1) where N-7 means that each sub-set of signalling sequences contains 128 signalling sequences for a total of 4 sub-sets of 512 signalling sequences;
first, a CAZAC sequence is generated:
then, it is cyclically shifted:
si *(n)＝[s(ki-1),s(ki),...,S(root-1),s(0),...,s(ki-1)]
finally, the sequence of length L is truncated from the head of the sequence:
SCi(n)＝si *(n),n＝0～L-1
the resulting sequence SCi(n) is the required ith signaling sequence.
R is the average power ratio of the fixed sequence to the signaling sequence, which is 1 in this example.
1) The root value of the first signaling sequence subset is 353;
the values of q are all in the following table:
1 9 10 16 18 21 28 29 32 35 49 51 53 54 55
57 59 60 61 65 68 70 74 75 76 77 78 82 84 85
86 88 90 95 96 103 113 120 123 125 126 133 134 135 137
138 140 141 142 145 147 148 150 151 155 156 157 161 163 165
167 170 176 178 179 181 182 184 185 187 194 200 201 204 209
210 217 222 223 224 225 229 232 234 235 237 239 241 244 246
247 248 249 251 252 253 254 255 262 270 272 273 280 282 290
291 306 307 308 309 311 313 314 315 317 320 326 327 330 331
333 336 338 340 342 345 347 349
the number of bits of the cyclic shift is all the values in the following table:
105 244 172 249 280 251 293 234 178 11 63 217 83 111 282
57 85 134 190 190 99 180 38 191 22 254 186 308 178 251
277 261 44 271 265 298 328 282 155 284 303 113 315 299 166
342 133 115 225 13 26 326 148 195 145 185 121 58 162 118
151 182 230 39 249 305 309 144 188 181 265 140 212 137 10
298 122 281 181 267 178 187 177 352 4 353 269 38 342 288
277 88 124 120 162 204 174 294 166 157 56 334 110 183 131
171 166 321 96 37 261 155 34 149 156 267 332 93 348 300
245 101 186 117 329 352 215 55
2) root value of the second subset of signaling sequences is 367;
the values of q are all in the following table:
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80
119 120 121 123 140 142 151 154 162 166 171 184 186 188 190
191 193 194 195 198 203 204 207 208 209 210 211 212 214 215
219 220 221 222 223 224 226 228 230 232 233 235 236 237 239
240 241 243 245 249 250 252 254 257 259 260 261 262 263 264
265 266 267 269 271 272 273 275 276 277 278 281 282 283 284
285 286 289 294 297 299 302 303 306 307 310 311 312 313 314
316 317 321 322 323 326 327 329 331 332 334 338 340 342 344
345 347 349 351 356 361 363 366
the number of bits of the cyclic shift is all the values in the following table:
198 298 346 271 345 324 160 177 142 71 354 290 69 144 28
325 100 55 237 196 271 210 187 277 8 313 53 53 194 294
36 202 69 25 18 179 318 149 11 114 254 191 226 138 179
341 366 176 64 50 226 23 181 26 327 141 244 179 74 23
256 265 223 288 127 86 345 304 260 139 312 62 360 107 201
301 263 257 184 329 300 81 121 49 196 201 94 147 346 179
59 212 83 195 145 3 119 152 310 31 134 54 187 131 63
276 294 142 246 54 181 121 273 276 36 47 16 199 243 235
194 348 95 262 52 210 115 250
3) the root value of the third subset of signaling sequences is 359;
the values of q are all in the following table:
1 3 5 6 9 12 14 22 29 30 32 34 60 63 65
67 72 74 76 78 83 84 87 88 89 90 91 92 94 95
96 99 112 115 123 124 128 137 141 143 145 149 152 153 154
155 159 164 165 169 175 179 183 186 187 188 189 192 197 199
201 202 203 211 215 219 220 221 223 226 227 228 229 230 234
237 238 239 243 246 248 249 250 252 254 257 258 261 262 273
274 280 282 284 286 288 290 297 298 300 303 308 309 310 312
313 314 317 318 319 320 321 322 323 324 326 333 334 335 336
339 341 342 344 349 351 352 355
the number of bits of the cyclic shift is all the values in the following table:
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20
18 226 165 320 339 352 316 241 336 119 166 258 273 302 275
46 26 259 330 206 46 10 308 165 195 314 330 208 148 275
15 214 251 8 27 264 169 128 207 21 246 14 291 345 114
306 179 109 336 322 149 270 253 207 152 26 190 128 137 196
268 36 40 253 29 264 153 221 341 116 24 55 60 171 25
100 202 37 93 115 174 239 148 170 37 328 37 253 237 355
39 288 225 223 140 163 145 264 75 29 282 252 270 30 262
271 305 122 78 27 127 92 6
4) the root value of the fourth signaling sequence subset is 373;
the values of q are all in the following table:
26 28 29 34 38 40 43 49 54 57 58 62 64 65 79
80 81 83 85 86 87 101 102 187 189 190 191 193 194 195
196 198 199 200 202 204 205 206 208 209 211 213 214 216 217
218 219 220 221 222 223 224 225 227 228 230 232 233 236 237
241 243 245 246 247 248 249 250 251 252 253 255 256 259 260
261 262 263 265 266 267 275 276 280 282 283 284 285 289 295
297 300 301 302 303 305 307 317 320 322 323 325 327 328 332
338 341 342 343 348 349 351 352 353 355 356 357 358 359 360
361 362 363 364 367 369 370 372
the number of bits of the cyclic shift is all the values in the following table:
333 337 177 125 169 270 254 88 123 310 96 273 120 239 157
224 62 119 19 235 136 117 237 100 244 181 295 249 356 9
289 139 82 171 178 292 158 308 257 42 55 210 320 294 100
75 79 163 195 80 303 97 271 179 359 178 241 281 367 58
91 7 179 39 267 245 213 286 349 172 35 301 361 102 301
155 1 34 96 293 202 87 176 248 319 301 168 280 154 244
215 370 260 117 30 329 42 149 112 125 50 249 197 273 230
13 142 244 335 57 21 261 48 370 110 296 326 224 77 112
31 262 121 38 283 323 93 94
and combining the 4 signaling sequence subsets to obtain a signaling sequence subcarrier set.
Therefore, the decoding of the signaling information carried by the preamble symbol by the receiving end includes: and performing operation on the signal containing the signaling sequence subcarrier and the signaling sequence subcarrier set or a time domain signal corresponding to the signaling sequence subcarrier set to solve the signaling information carried by the signaling sequence subcarrier in the preamble symbol.
Wherein the signal containing signaling sequence subcarriers comprises: all or part of the time domain waveform of the received preamble symbol, or a frequency domain OFDM symbol obtained by intercepting the time domain OFDM symbol from the preamble symbol and performing Fourier transform. The signaling sequence subcarrier set is a set formed by filling each signaling sequence in the signaling sequence set onto an effective subcarrier.
In particular, the N corresponding to the ODFM symbol body is truncatedACarrying out Fourier transformation on the time domain signal with the length to obtain a frequency domain OFDM symbol; then, removing zero carrier, and taking out the signal according to the position of signaling sub-carrierA received frequency domain signaling subcarrier. And performing specific mathematical operation on the channel estimation value and the known signaling subcarrier set to complete the frequency domain decoding function.
For example, let i equal to 0: M-1, M be the number of signaling subcarriers, and j equal to 0:2P-1, P is the number of signalling bits transmitted in the frequency domain, i.e. the corresponding set of signalling subcarriers has a total of 2PEach element corresponding to a sequence of length M, HiFor each channel estimation value corresponding to a signaling subcarrier, SC _ reciFor the received frequency domain signaling subcarrier values,and an ith value is taken for the jth element in the signaling subcarrier set. ThenTake max (corr)j) And corresponding j, obtaining the signaling information transmitted by the frequency domain.
In other embodiments, the above process may also be performed in the time domain, and a time domain signaling waveform set corresponding to a known signaling subcarrier set after fourier inverse transformation is directly and synchronously correlated with a time domain received signal at an accurate multipath position, and the one with the largest absolute value of a correlation value is taken, so that signaling information transmitted in the frequency domain may also be solved, which is not described herein again.
Further, the receiving end can also use the fixed sequence to perform integer frequency offset estimation or channel estimation.
Specifically, the present embodiment further includes the following steps: 1) intercepting a signal containing a fixed subcarrier according to the determined position of the preamble symbol in the physical frame; 2) and carrying out operation on the signal containing the fixed subcarrier and a frequency domain fixed subcarrier sequence or a time domain signal corresponding to the frequency domain fixed subcarrier sequence to obtain integral multiple frequency offset estimation or channel estimation.
Wherein the signal containing the fixed subcarriers comprises: all or part of the time domain waveform of the received preamble symbol, or a frequency domain OFDM symbol obtained by intercepting the time domain OFDM symbol from the preamble symbol and performing Fourier transform.
Two methods for performing integer frequency offset estimation at the receiving end are described in detail below.
The method comprises the following steps:
and intercepting all or part of the time domain waveform of the received preamble symbol according to the position of the detected preamble symbol in the physical frame. A frequency sweeping manner is adopted, that is, the partial time domain waveform is modulated with different frequency offsets by a fixed frequency change step diameter (for example, corresponding to an integral multiple frequency offset interval), so that a plurality of time domain signals are obtained:t is the sampling period, fsIs the sampling frequency. The time domain signal corresponding to the inverse fourier transform of the known frequency domain fixed sequence subcarrier is a2, a2 is used as a known signal, and a1 is assigned to each of the known signalsyPerforming sliding correlation, and selecting the A1 with the largest correlation peakyThen the frequency offset value y modulated by the frequency offset is the estimated integer frequency offset value.
Wherein, the sweep frequency range corresponds to the frequency deviation range that the system needs to resist, for example, the frequency deviation of plus or minus 500K needs to resist, the sampling rate of the system is 9.14M, the length of the preamble symbol main body is 1K, and the sweep frequency range isI.e., -57,57]。
The method 2 comprises the following steps:
and intercepting a time domain signal corresponding to the ODFM symbol main body in the preamble symbol, performing Fourier transform to obtain a frequency domain OFDM symbol, performing cyclic shift in the sweep frequency range on the frequency domain OFDM symbol obtained by the transform, performing 2-point-separated differential multiplication, performing correlation operation on the frequency domain OFDM symbol and a 2-point-separated differential multiplication value of a known fixed sequence subcarrier to obtain a series of correlation values, and selecting the cyclic shift corresponding to the maximum correlation value to correspondingly obtain an integer frequency offset estimation value.
The received signal containing the fixed sequence subcarrier and the known frequency domain fixed sequence subcarrier and/or the time domain signal corresponding to the inverse fourier transform are used to complete channel estimation, and may be performed in the time domain and/or in the frequency domain, which is not described herein again.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims (23)

1. A method for receiving and processing preamble symbols in a physical frame, comprising the steps of:
processing the received digital signal to obtain a baseband signal;
performing delay sliding correlation and/or demodulation frequency offset on a baseband signal by using a cyclic prefix, a time domain OFDM symbol and a delay relation and a modulation frequency offset relation between every two modulation signals in a preamble symbol expected to be received, performing mathematical operation based on a delay correlation accumulated value, and judging whether the preamble symbol expected to be received exists in the baseband signal based on peak detection, wherein the preamble symbol expected to be received is mainly the time domain OFDM symbol, the front part of the preamble symbol expected to be received has a cyclic prefix, and the rear part of the preamble symbol expected to be received has a time domain structure of the modulation signals;
and if the judgment result is yes, determining the position of the preamble symbol in the physical frame and solving the signaling information carried by the preamble symbol.
2. The method as claimed in claim 1, wherein the determining whether the preamble symbol expected to be received exists in the baseband signal comprises:
according to the delay relationship and the modulation frequency offset relationship between each two of a cyclic prefix, a time domain OFDM symbol and a modulation signal in a preamble symbol expected to be received, performing delay sliding correlation and/or demodulation frequency offset on a baseband signal to obtain three delay correlation accumulated values;
performing mathematical operation on one, two or three of the three delay correlation accumulated values, and performing peak value detection on the absolute value of the operation result;
and if the peak value detection result meets a preset condition, determining that the pilot symbol expected to be received exists in the baseband signal.
3. The method as claimed in claim 2, wherein the determining the position of the preamble symbol in the physical frame comprises:
the position of the preamble symbol in the physical frame is determined based on the result of peak detection satisfying a preset condition.
4. The method as claimed in claim 1, wherein the decoding the signaling information carried by the preamble symbol comprises the following steps:
and solving signaling information carried by the preamble symbol by using all or part of the time domain waveform of the preamble symbol and/or a frequency domain signal obtained by performing Fourier transform on all or part of the time domain waveform of the preamble symbol.
5. The method as claimed in claim 1, wherein the preamble symbol expected to be received has the following characteristics: 1) intercepting a time domain OFDM symbol with a cyclic prefix length from the time domain OFDM symbol as a cyclic prefix; 2) generating a modulation signal based on the intercepted time domain OFDM symbol with the cyclic prefix length;
the OFDM signal transmission method comprises the steps that in a time domain OFDM symbol for intercepting a cyclic prefix length, different initial positions are selected to intercept the time domain OFDM symbol with a modulation signal length to generate a modulation signal, so that a finally formed preamble symbol transmits signaling information through the different initial positions;
the determining whether there is a preamble symbol expected to be received in the baseband signal includes:
and generating a plurality of different delay relations between the modulation signal and the cyclic prefix and between the modulation signal and the time domain OFDM symbol based on different initial positions so as to judge whether the baseband signal has the preamble symbol expected to be received or not.
6. The method for receiving and processing preamble symbols in a physical frame according to claim 5,
and if the judgment result is yes, determining the position of the preamble symbol in the physical frame and solving the signaling information carried by the preamble symbol.
7. The method as claimed in claim 5, wherein the generating a plurality of different delay relationships between the modulation signal and the cyclic prefix and between the modulation signal and the time domain OFDM symbol based on different start positions to determine whether there is a preamble symbol expected to be received in the baseband signal comprises:
according to the delay relations between a plurality of different modulation signals and cyclic prefixes and between the modulation signals and time domain OFDM symbols, further obtaining a plurality of delay related accumulation value groups, wherein each group comprises delay sliding correlation and demodulation frequency deviation of the baseband signals according to the delay relations and/or modulation frequency deviation relations between the cyclic prefixes, the time domain OFDM symbols and the modulation signals in the expected received preamble symbols, so as to obtain three delay related accumulation values;
computing one, two or three delay correlation accumulated values in each delay correlation accumulated value group, and carrying out peak value detection on the absolute value of the obtained multiplication result;
and if the result of one group of peak value detection meets a preset condition, determining that the pilot symbol expected to be received exists in the baseband signal.
8. The method for receiving and processing preamble symbols in a physical frame according to claim 7,
if the result of the peak detection of a certain group meets the preset condition, the signaling corresponding to the initial position of the modulation signal segment corresponding to the group is the transmitted signaling information.
9. The method as claimed in claim 1, wherein the frequency domain OFDM symbol corresponding to the time domain OFDM symbol comprises:
the system comprises effective subcarriers and zero sequence subcarriers, wherein the zero sequence subcarriers are positioned on two sides of the effective subcarriers; the effective subcarriers comprise fixed sequence subcarriers and signaling sequence subcarriers, and the fixed sequence subcarriers and the signaling sequence subcarriers are arranged in a parity-staggered manner;
the decoding of the signaling information carried by the preamble symbol includes:
and performing operation on the signal containing the signaling sequence subcarrier and the signaling sequence subcarrier set or a time domain signal corresponding to the signaling sequence subcarrier set to solve the signaling information carried by the signaling subcarrier in the preamble symbol.
10. The method for receiving and processing preamble symbols in a physical frame according to claim 1, further comprising the steps of:
intercepting a signal containing a fixed sequence subcarrier according to the determined position of the preamble symbol in the physical frame;
and carrying out operation on the signal containing the fixed sequence subcarrier and a known frequency domain fixed sequence subcarrier or a time domain signal corresponding to the frequency domain fixed sequence subcarrier to obtain integral multiple frequency offset estimation or channel estimation.
11. The method as claimed in claim 10, wherein the signal containing the fixed sequence of subcarriers comprises: all or part of the time domain waveform of the received preamble symbol, or a frequency domain OFDM symbol obtained by intercepting the time domain OFDM symbol from the preamble symbol and performing Fourier transform.
12. The method as claimed in claim 9, wherein the signal containing the signaling sequence subcarriers comprises: all or part of the time domain waveform of the received preamble symbol, or a frequency domain OFDM symbol obtained by intercepting the time domain OFDM symbol from the preamble symbol and performing Fourier transform.
13. The method as claimed in claim 10, wherein the integer frequency offset estimation is obtained by performing differential correlation and cyclic shift on a frequency domain OFDM symbol obtained by fourier transforming a truncated time domain OFDM symbol in the preamble symbol, and performing differential correlation on a known frequency domain fixed sequence subcarrier, and performing operation according to the results of the two.
14. The method as claimed in claim 10, wherein the integer frequency offset estimation is obtained based on the time domain signal operation of the time domain OFDM symbol in the preamble symbol corresponding to the known frequency domain fixed sequence subcarrier in a frequency sweeping manner.
15. The method as claimed in claim 9, wherein said decoding the signaling information carried by the preamble symbol comprises:
and performing synchronous correlation operation one by one based on all or part of the received time domain waveforms of the preamble symbols for acquiring the accurate position of a certain multipath and the time domain signals corresponding to the subcarrier set of the known signaling sequence, and solving corresponding signaling information by using the signal with the largest absolute value of the correlation value.
16. The method as claimed in claim 9, wherein said decoding the signaling information carried by the preamble symbol comprises:
and performing conjugate multiplication accumulation mathematical operation on the frequency domain OFDM symbol obtained by cutting the time domain OFDM symbol from the preamble symbol and performing Fourier transform on the frequency domain OFDM symbol, the channel estimation value and a known signaling sequence subcarrier set to solve signaling information carried by the signaling subcarrier in the preamble symbol.
17. The method as claimed in claim 2, wherein the performing delay sliding correlation on the baseband signal according to the delay relationship and/or modulation frequency offset relationship between two of the cyclic prefix, the time domain OFDM symbol and the modulation signal in the preamble symbol expected to be received comprises:
delaying a received signal by 1024 sampling points to perform sliding correlation on the received signal to obtain a first delay correlation accumulated value;
delaying 1528 sampling points or 1536 sampling points of the received signal, and performing sliding correlation on the received signal after frequency offset demodulation to obtain a second delay correlation accumulated value;
and delaying the received signal by 504 sampling points or 512 sampling points to perform sliding correlation on the received signal after demodulating the frequency offset so as to obtain a third delay correlation accumulated value.
18. The method for receiving and processing preamble symbols in a physical frame according to claim 7,
the method comprises two delay correlation accumulation value groups, wherein the corresponding emergency alarm broadcast flag is 0 or 1;
the group with the emergency alert broadcast flag of 0, takes the following delay slip correlation process:
delaying a received signal by 1024 sampling points to perform sliding correlation on the received signal;
1528 sampling points of the received signal delay are in sliding correlation with the received signal after frequency offset demodulation;
the received signal delays 504 sampling points and carries out sliding correlation on the received signal after frequency offset demodulation;
the group with the emergency alert broadcast flag of 1, takes the following delay slip correlation process:
the received signal is delayed by 1024 sampling points and is subjected to sliding correlation with the received signal after frequency offset demodulation;
carrying out sliding correlation on the received signal subjected to frequency offset demodulation by 1544 sampling points;
the received signal is delayed by 520 sampling points and is subjected to sliding correlation with the received signal after frequency offset demodulation.
19. The method for receiving and processing preamble symbols in a physical frame according to claim 2,
peak detection is performed based on a value of the delay correlation accumulated value after mathematical operation, and fractional frequency offset estimation is performed by using a maximum value of the peak value or a plurality of values with large peak values.
20. The method of claim 10, wherein the integer multiple frequency offset is based on a subcarrier spacing of the OFDM symbol.
21. The method of claim 19, wherein the fractional frequency offset is based on a subcarrier spacing of the OFDM symbol.
22. The method for receiving and processing preamble symbols in a physical frame according to claim 9, wherein the set of signaling sequence subcarriers is characterized by:
the number of the signaling sequences is 512, the signaling sequence subcarrier set comprises 4 signaling sequence subsets, each signaling sequence subset comprises 128 signaling sequences, and the length L of each signaling sequence is 353;
the method for generating the signaling sequence comprises the following steps:
number of cyclically shifted bits (q)i,ki,i＝0～2N-1) where N-7 means that each sub-set of signalling sequences contains 128 signalling sequences for a total of 4 sub-sets of 512 signalling sequences;
first, a CAZAC sequence is generated:
then, it is cyclically shifted:
si *(n)＝[si(ki-1),si(ki),...,si(root-1),si(0),...,si(ki-1)]
finally, the sequence of length L is truncated from the head of the sequence:
SCi(n)＝si *(n),n＝0～L-1
the resulting sequence SCi(n) is the required ith signaling sequence;
r is the average power ratio of the fixed sequence to the signaling sequence;
1) the root value of the first signaling sequence subset is 353;
the values of q are all in the following table:
1 9 10 16 18 21 28 29 32 35 49 51 53 54 55 57 59 60 61 65 68 70 74 75 76 77 78 82 84 85 86 88 90 95 96 103 113 120 123 125 126 133 134 135 137 138 140 141 142 145 147 148 150 151 155 156 157 161 163 165 167 170 176 178 179 181 182 184 185 187 194 200 201 204 209 210 217 222 223 224 225 229 232 234 235 237 239 241 244 246 247 248 249 251 252 253 254 255 262 270 272 273 280 282 290 291 306 307 308 309 311 313 314 315 317 320 326 327 330 331 333 336 338 340 342 345 347 349
the number of bits of the cyclic shift is all the values in the following table:
105 244 172 249 280 251 293 234 178 11 63 217 83 111 282 57 85 134 190 190 99 180 38 191 22 254 186 308 178 251 277 261 44 271 265 298 328 282 155 284 303 113 315 299 166 342 133 115 225 13 26 326 148 195 145 185 121 58 162 118 151 182 230 39 249 305 309 144 188 181 265 140 212 137 10 298 122 281 181 267 178 187 177 352 4 353 269 38 342 288 277 88 124 120 162 204 174 294 166 157 56 334 110 183 131 171 166 321 96 37 261 155 34 149 156 267 332 93 348 300 245 101 186 117 329 352 215 55
2) root value of the second subset of signaling sequences is 367;
the values of q are all in the following table:
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80 119 120 121 123 140 142 151 154 162 166 171 184 186 188 190 191 193 194 195 198 203 204 207 208 209 210 211 212 214 215 219 220 221 222 223 224 226 228 230 232 233 235 236 237 239 240 241 243 245 249 250 252 254 257 259 260 261 262 263 264 265 266 267 269 271 272 273 275 276 277 278 281 282 283 284 285 286 289 294 297 299 302 303 306 307 310 311 312 313 314 316 317 321 322 323 326 327 329 331 332 334 338 340 342 344 345 347 349 351 356 361 363 366
the number of bits of the cyclic shift is all the values in the following table:
198 298 346 271 345 324 160 177 142 71 354 290 69 144 28 325 100 55 237 196 271 210 187 277 8 313 53 53 194 294 36 202 69 25 18 179 318 149 11 114 254 191 226 138 179 341 366 176 64 50 226 23 181 26 327 141 244 179 74 23 256 265 223 288 127 86 345 304 260 139 312 62 360 107 201 301 263 257 184 329 300 81 121 49 196 201 94 147 346 179 59 212 83 195 145 3 119 152 310 31 134 54 187 131 63 276 294 142 246 54 181 121 273 276 36 47 16 199 243 235 194 348 95 262 52 210 115 250
3) the root value of the third subset of signaling sequences is 359;
the values of q are all in the following table:
the number of bits of the cyclic shift is all the values in the following table:
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20 18 226 165 320 339 352 316 241 336 119 166 258 273 302 275 46 26 259 330 206 46 10 308 165 195 314 330 208 148 275 15 214 251 8 27 264 169 128 207 21 246 14 291 345 114 306 179 109 336 322 149 270 253 207 152 26 190 128 137 196 268 36 40 253 29 264 153 221 341 116 24 55 60 171 25 100 202 37 93 115 174 239 148 170 37 328 37 253 237 355 39 288 225 223 140 163 145 264 75 29 282 252 270 30 262 271 305 122 78 27 127 92 6
4) the root value of the fourth signaling sequence subset is 373;
the values of q are all in the following table:
26 28 29 34 38 40 43 49 54 57 58 62 64 65 79 80 81 83 85 86 87 101 102 187 189 190 191 193 194 195 196 198 199 200 202 204 205 206 208 209 211 213 214 216 217 218 219 220 221 222 223 224 225 227 228 230 232 233 236 237 241 243 245 246 247 248 249 250 251 252 253 255 256 259 260 261 262 263 265 266 267 275 276 280 282 283 284 285 289 295 297 300 301 302 303 305 307 317 320 322 323 325 327 328 332 338 341 342 343 348 349 351 352 353 355 356 357 358 359 360 361 362 363 364 367 369 370 372
the number of bits of the cyclic shift is all the values in the following table:
and combining the 4 signaling sequence subsets to obtain a signaling sequence subcarrier set.
23. The method as claimed in claim 10, wherein the fixed sequence subcarrier set is characterized by:
the fixed sequence has a length of 353 and an amplitude of 1, as represented by:
wherein, ω isnThe values of (A) are arranged in rows from left to right in sequence as shown in the following table:
5.43 2.56 0.71 0.06 2.72 0.77 1.49 6.06 4.82 2.10 5.62 4.96 4.93 4.84 4.67 5.86 5.74 3.54 2.50 3.75 0.86 1.44 3.83 4.08 5.83 1.47 0.77 1.29 0.16 1.38 4.38 2.52 3.42 3.46 4.39 0.61 4.02 1.26 2.93 3.84 3.81 6.21 3.80 0.69 5.80 4.28 1.73 3.34 3.08 5.85 1.39 0.25 1.28 5.14 5.54 2.38 6.20 3.05 4.37 5.41 2.23 0.49 5.12 6.26 3.00 2.60 3.89 5.47 4.83 4.17 3.36 2.63 3.94 5.13 3.71 5.89 0.94 1.38 1.88 0.13 0.27 4.90 4.89 5.50 3.02 1.94 2.93 6.12 5.47 6.04 1.14 5.52 2.01 1.08 2.79 0.74 2.30 0.85 0.58 2.25 5.25 0.23 6.01 2.66 2.48 2.79 4.06 1.09 2.48 2.39 5.39 0.61 6.25 2.62 5.36 3.10 1.56 0.91 0.08 2.52 5.53 3.62 2.90 5.64 3.18 2.36 2.08 6.00 2.69 1.35 5.39 3.54 2.01 4.88 3.08 0.76 2.13 3.26 2.28 1.32 5.00 3.74 1.82 5.78 2.28 2.44 4.57 1.48 2.48 1.52 2.70 5.61 3.06 1.07 4.54 4.10 0.09 2.11 0.10 3.18 3.42 2.10 3.50 4.65 2.18 1.77 4.72 5.71 1.48 2.50 4.89 4.04 6.12 4.28 1.08 2.90 0.24 4.02 1.29 3.61 4.36 6.00 2.45 5.49 1.02 0.85 5.58 2.43 0.83 0.65 1.95 0.79 5.45 1.94 0.31 0.12 3.25 3.75 2.35 0.73 0.20 6.05 2.98 4.70 0.69 5.97 0.92 2.65 4.17 5.71 1.54 2.84 0.98 1.47 6.18 4.52 4.44 0.44 1.62 6.09 5.86 2.74 3.27 3.28 0.55 5.46 0.24 5.12 3.09 4.66 4.78 0.39 1.63 1.20 5.26 0.92 5.98 0.78 1.79 0.75 4.45 1.41 2.56 2.55 1.79 2.54 5.88 1.52 5.04 1.53 5.53 5.93 5.36 5.17 0.99 2.07 3.57 3.67 2.61 1.72 2.83 0.86 3.16 0.55 5.99 2.06 1.90 0.60 0.05 4.01 6.15 0.10 0.26 2.89 3.12 3.14 0.11 0.11 3.97 5.15 4.38 2.08 1.27 1.17 0.42 3.47 3.86 2.17 5.07 5.33 2.63 3.20 3.39 3.21 4.58 4.66 2.69 4.67 2.35 2.44 0.46 4.26 3.63 2.62 3.35 0.84 3.89 4.17 1.77 1.47 2.03 0.88 1.93 0.80 3.94 4.70 6.12 4.27 0.31 4.85 0.27 0.51 2.70 1.69 2.18 1.95 0.02 1.91 3.13 2.27 5.39 5.45 5.45 1.39 2.85 1.41 0.36 4.34 2.44 1.60 5.70 2.60 3.41 1.84 5.79 0.69 2.59 1.14 5.28 3.72 5.55 4.92 2.64
。
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