CN107277567B

CN107277567B - Signaling coding modulation method and demodulation decoding method based on superposition coding

Info

Publication number: CN107277567B
Application number: CN201710476771.1A
Authority: CN
Inventors: 张文军; 史毅俊; 何大治; 管云峰; 郭序峰
Original assignee: Shanghai National Engineering Research Center of Digital Television Co Ltd
Current assignee: Shanghai National Engineering Research Center of Digital Television Co Ltd
Priority date: 2014-12-24
Filing date: 2014-12-24
Publication date: 2020-02-14
Anticipated expiration: 2034-12-24
Also published as: CN105791897B; CN107277566A; CN107277566B; CN105791897A; CN107277567A

Abstract

The invention provides a signaling coding modulation method and a signaling demodulation decoding method based on superposition coding, which are characterized by comprising the following steps: at the transmitting end, low level signalling b_LIncluding coded modulation scheme, high level signalling b, of each service_HThe bit number and modulation mode of the corresponding low-level signaling are included to respectively convert the high-level signaling signal s_HAnd low level signaling signals s_LAnd carrying out superposition coding according to a preset superposition rule to obtain a signaling signal s, further processing to obtain a baseband waveform, demodulating and decoding a high-level signaling signal at a receiving end by firstly extracting a first part of signaling signal, corresponding first channel information and a first noise variance estimation value, then eliminating the high-level signaling signal from the received signal, and then demodulating and decoding a low-level signaling signal through a second part of signaling signal, corresponding second channel information and a second noise variance estimation value according to the bit number and the coding and modulation mode of the low-level signaling obtained from the high-level signaling.

Description

Signaling coding modulation method and demodulation decoding method based on superposition coding

The application is a divisional application of an original case, wherein the application number of the original case is 201410837562.1, and the application date is 2014, 12 and 24, and the invention is invented and named as a signaling coding modulation method and a demodulation decoding method based on superposition coding.

Technical Field

The invention relates to the field of coding transmission, in particular to a signaling coding modulation method and a signaling demodulation decoding method based on superposition coding.

Background

With the increasing requirements of service operation, in a scenario that services with different quality of service (QoS) need to be broadcast simultaneously, superposition coding (superposition coding) is a technology for effectively increasing the total channel capacity.

Common applications of superposition coding techniques are: the modulation coding method at the transmitting end is that firstly, a plurality of services with different service qualities are respectively coded and modulated, then the signals which are coded and modulated are respectively multiplied by different power factors, and finally, the signals are superposed together. Correspondingly, the demodulation and decoding method at the receiving end is that firstly the layer signal with the maximum power factor is regarded as data, and the other layers are regarded as noise, so that firstly the layer with the maximum power factor is demodulated and decoded to obtain the information bit, then the layer of signal which is coded and modulated is recovered, and then the recovered signal is subtracted from the received signal, thus the superposition of the signals of all the other layers except the layer signal with the maximum power factor is obtained. By analogy, the signals of all layers can be demodulated and decoded.

Therefore, the superposition coding technique has the following limitations in practical application:

in order to demodulate and decode a certain layer of traffic, all traffic having a power factor greater than that of the layer of traffic must be first demodulated, decoded and canceled. This adds significantly additional complexity when the receiving end does not need to receive other traffic.

When the coded modulation of each service respectively contains different parameters and time interleaving with a large depth, the storage resource of the receiving end is greatly increased.

In addition, in the existing DVB-T2 standard, broadcast services are carried by individual DVB-T2 frames. And each DVB-T2 frame contains parameters that signal the service it carries. DVB-T2 employs a hierarchical signaling structure, with each DVB-T2 frame containing preamble signaling P1, high level signaling L1-Pre, and low level signaling L1-Post. The preamble signaling contains information necessary for the receiver to successfully demodulate and decode the high-level signaling, and the preamble signaling and the high-level signaling contain information necessary for the receiver to successfully demodulate and decode the low-level signaling. For the encoding of the high-level signaling L1-Pre and the low-level signaling L1-Post, the existing processing method is to simply splice the two directly and sequentially.

Disclosure of Invention

The problem to be solved by the present invention is that the existing superposition coding mode increases the extra complexity of the system, and in order to realize broadcasting a plurality of services with different service qualities, the problem of increasing the memory resource caused by the service data participating in interleaving together exists, and in addition, the existing direct splicing processing method of the signaling signal in the DVB-T2 standard can not further substantially improve the total channel capacity.

In order to solve the above problem, an embodiment of the present invention provides a signaling coding modulation method based on superposition coding, where a physical frame carries a high-level signaling b_HAnd low level signalling b_LThe method is characterized by comprising the following steps: for high-level signalling b respectively_HAnd low level signalling b_LCode modulation is carried out to obtain a high-level signaling signal s_HAnd low level signaling signals s_L(ii) a Will be a high level signalling signal s_HAnd low level signaling signals s_LPerforming superposition coding according to a preset superposition rule to obtain a signaling signal s; and combining and modulating the signaling signal s with other signaling and data signals to obtain a baseband waveform of a physical frame, wherein the low-level signaling b_LAt least comprises the following components: code modulation mode, high-level signaling b, respectively adopted by each service in physical frame_HAt least comprises the following components: bit number of corresponding low level signaling and modulation mode adopted by the low level signaling, high level signaling signal s_HNumber M of medium or plural_HLess than or equal to low level signaling signal s_LNumber M of medium or plural_L。

Optionally, the predetermined superposition rule includes: will be a high level signalling signal s_HAnd low level signaling signals s_LSuperimposing to obtain a vector containing M_LA plurality of signalling signalsWherein,

α_Hand α_LFor a predetermined power factor, α_HAnd α_Lα satisfies the predetermined relationship_HMust be greater than α_LAnd satisfy

Optional, high-level signalling signals s_HThe length, modulation mode and threshold value are fixed; low level signalling signal s_LHas variable length and variable modulation mode.

Optionally, the physical frame further carries a preamble signaling, where the preamble signaling includes an overlay indication field S_SPThe superposition indication field S_SPFor indicating high level signalling b_HAnd low level signalling b_LWhether the coded modulation of (2) adopts the superposition coding mode in the signaling coded modulation method or not.

The embodiment of the invention also provides a signaling demodulation and decoding method based on superposition coding, which is characterized by comprising the following steps: extracting the front M in the signaling signal from the baseband waveform formed at the transmitting end by using the above order code modulation method_HThe elements correspond to one another, and the first part of the signaling signals, the corresponding first channel information and the first noise variance estimation value are correspondingly arranged; taking a low-level signaling signal in the signaling signal as noise, and demodulating and decoding by using a first part of signaling signal, first channel information and a first noise variance estimation value to obtain a high-level signaling; carrying out coding modulation on the high-level signaling to obtain a high-level signaling signal, and eliminating the high-level signaling signal from the first part of signaling signals; obtaining the number M of complex numbers in the low-level signaling signal according to the bit number and the code modulation mode of the low-level signaling obtained from the high-level signaling_L(ii) a After extracting the signaling signal of the transmitting end from the baseband waveform formed at the transmitting end by the above-mentioned signaling code modulation method (M)_L-M_H) The elements correspond to one another, and the second part of the signaling signals, the corresponding second channel information and a second noise variance estimation value are obtained; and demodulating and decoding by using the first part of the signaling signal, the first channel information and the first noise variance estimation value of which the high-level signaling signal is eliminated and the second part of the signaling signal, the second channel information and the second noise variance estimation value to obtain the low-level signalAnd (5) making.

Optionally, the first part of the signaling signal is represented as

The first channel information is expressed as

The first noise variance estimate value is expressed as

Wherein,

is to a random variable(0≤k＜M_H) An estimate of variance of (c); the second part of the signaling signal is represented as

The second channel information is expressed as

The second noise variance estimate value is expressed as

Wherein,

is to a random variable

(M_H≤k＜M_L) Is estimated.

Optionally, the first part of the signaling signal with the high level signaling signal eliminated is represented as

Wherein,

and the same

The corresponding channel information is still the first channel information h_AAnd a first noise variance estimate

Optionally, the obtaining of the high-level signaling by demodulating and decoding includes the following steps: signaling the first part

First channel information h_AAnd a first noise variance estimate

Performing demapping to obtain log-likelihood ratio LLR₁Then decoding is carried out to obtain a high-level signaling b_H。

Optionally, the obtaining of the low-level signaling by demodulating and decoding includes the following specific steps: the high-level signaling signal s will be eliminated_HOf the first part of the signalling signalFirst channel information h_AThe first noise variance estimation value

Performing demapping to obtain a first log-likelihood ratio LLR_1A(ii) a Signaling the second part

Second channel information h_BAnd a second noise variance estimateDe-mapping to obtain a second log likelihood ratio LLR_1B(ii) a The obtained first log likelihood ratio LLR_1AAnd a second log-likelihood ratio LLR_1BThe splicing is carried out, and the splicing,obtaining a combined log-likelihood ratio LLR_z(ii) a And combining log-likelihood ratios (LLRs)_zDecoding to obtain low-level signaling b_L。

Optionally, the method further comprises the following steps: the receiving end extracts the leading signaling first and obtains the superposition indication field S in the leading signaling_SPBy the superposition indication field S_SPJudging whether the signaling signal adopts superposition coding, and extracting the baseband waveform.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

because the signaling coding modulation method and the demodulation decoding method based on superposition coding according to the invention are concerned, at the sending end, the low-level signaling b_LIncluding coded modulation scheme, high level signalling b, of each service_HThe bit number and modulation mode of the corresponding low-level signaling are included to respectively convert the high-level signaling signal s_HAnd low level signaling signals s_LThe invention carries on superposition coding according to the preset superposition rule to get the signaling signal s, further processes to get the baseband wave, in addition, at the receiving end, the first part signaling signal, the corresponding first channel information and the first noise variance estimation value are extracted to demodulate and decode the high level signaling signal, then eliminates it from the receiving signal, according to the bit number and the coding modulation mode of the low level signaling obtained from the high level signaling, the second part signaling signal, the corresponding second channel information and the second noise variance estimation value are used to demodulate and decode the low level signaling signal, therefore, the invention can effectively improve the transmission capacity or the transmission reliability aiming at the superposition coding of the high level signaling and the low level signaling, and is decided by the characteristics of the hierarchical signaling, in order to demodulate and decode the low level signaling, the high level signaling must be demodulated and decoded first, therefore, the complexity of the superposition coding is not increased, and in addition, the receiving end memory resource is not increased because the signaling is not subjected to time interleaving as the data is.

Drawings

Fig. 1 is a schematic flow chart of a signaling coding modulation method based on superposition coding in an embodiment of the present invention;

FIG. 2 is a schematic block diagram of signaling code modulation at a transmitting end in an embodiment of the present invention;

fig. 3 is a diagram illustrating a superimposed structure of preamble signaling, high level signaling and low level signaling in a physical frame according to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating a signaling demodulation decoding method based on superposition coding according to an embodiment of the present invention; and

fig. 5 is a schematic block diagram of signaling codec decoding at the receiving end in the embodiment of the present invention.

Detailed Description

The inventor finds that in the prior art, an additional complexity of a system is increased by an existing superposition coding mode, and in order to realize broadcasting of a plurality of services with different service qualities, a problem of increasing memory resources caused by the fact that service data participates in interleaving together exists, and in addition, the overall channel capacity cannot be further substantially increased by a direct splicing processing method of signaling signals in the existing DVB-T2 standard.

In view of the above problems, the inventors have studied and provided a signaling coding modulation method and a demodulation decoding method based on superposition coding, and advanced signaling signal s is transmitted at the transmitting end_HAnd low level signaling signals s_LThe signal s is obtained by superposition coding according to the preset superposition rule, the baseband waveform is further processed, in addition, the high-level signal is demodulated and decoded at the receiving end, then the signal is eliminated from the received signal, and then the low-level signal is demodulated and decoded, so that the transmission capacity or the transmission reliability can be effectively improved.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

The embodiment of the invention provides a signaling coding modulation method based on superposition coding. Fig. 1 is a schematic flow chart of a signaling coding modulation method according to an embodiment of the present invention.

Referring to fig. 1, in the signaling coding modulation method based on superposition coding, each physical frame (for example, DVB-T2 frame in DVB-T2 system) needs to carry a set of high level signaling b_HAnd a set of low level signalling b_LThe signaling coding modulation method comprises the following steps:

step S11: respectively to contain N_HHigh level signaling of a bit

And comprises N_LLow level signaling of individual bits

Code modulation is carried out to obtain a code containing M_HComplex high-level signaling signal

And comprises M_LA plurality of low level signaling signals

Step S12: will be a high level signalling signal s_HAnd low level signaling signals s_LPerforming superposition coding according to a preset superposition rule to obtain a product containing M_LA plurality of signalling signals

Wherein,

α_Hand α_LFor a predetermined power factor, α_HMust be greater than α_LAnd is and

and

step S13: and combining and modulating the signaling signal s with other signaling and data signals to obtain a baseband waveform of the physical frame.

Wherein the low-level signaling b in the signaling code modulation method_LAt least comprises the following components: coded modulation mode adopted by each service (such as PLP in DVB-T2 system) carried by physical frame, high level signaling b_HAt least comprises the following components: the bit number of the corresponding low-level signaling and the modulation mode adopted by the low-level signaling.

The method is only applicable to M_H≤M_LThat is, the high-level signaling signal s_HNumber M of medium or plural_HLess than or equal to low level signaling signal s_LNumber M of medium or plural_L。

Fig. 2 is a schematic block diagram of signaling code modulation at the transmitting end in an embodiment of the present invention.

As shown in fig. 2, after high-level signaling and low-level signaling in the hierarchical signaling structure are coded and modulated respectively, the obtained high-level signaling signal and low-level signaling signal are superposition coded according to a predetermined superposition coding rule to obtain a signaling signal, and further, the signaling signal is combined with other signaling and data signals and modulated to obtain a baseband waveform of a physical frame.

Fig. 3 is a diagram illustrating a superimposed structure of preamble signaling, high-level signaling, and low-level signaling in a physical frame according to an embodiment of the present invention.

As shown in fig. 3, in the present embodiment, the physical frame carries preamble signaling, high-level signaling signals, and low-level signaling signals. The leading signaling is located at the front section of the signaling structure, the high-level signaling signal and the low-level signaling signal located at the rear section are superposition coded according to a predetermined superposition coding rule, and the leading signaling, which is not shown in fig. 3, includes a superposition indication field S_SPThe superposition indication field S_SPFor indicating the high level signaling b_HAnd said low level signalling b_LWhether or not the coded modulation of (2) employs superposition coding as described in fig. 1.

It should be noted that, in the present invention, only transmission in the physical frame can be determinedWhen the high-level signaling and the low-level signaling which are not subjected to superposition coding are transmitted or only the high-level signaling and the low-level signaling which are both subjected to superposition coding are transmitted, the physical frame can not carry the preamble signaling, so that the superposition indication field S is not required to be utilized_SPTo indicate the superposition coding mode.

As shown in fig. 3, specifically, the predetermined superposition rule is: will be a high level signalling signal s_HAnd low level signaling signals s_LSuperimposing to obtain a vector containing M_LA plurality of signalling signals

Wherein the predetermined superposition rule is expressed by the following formula,

in this formula, α_HAnd α_LFor a predetermined power factor, α_HAnd α_Lα satisfies the predetermined relationship_HMust be greater than α_LAnd satisfy

The embodiment of the invention also provides a signaling demodulation decoding method based on superposition coding. Fig. 4 is a flowchart illustrating a signaling demodulation decoding method based on superposition coding for a receiving end according to an embodiment of the present invention.

Referring to fig. 4, the signaling demodulation decoding method at the receiving end includes the following steps:

step S21: extracting the front M of the signaling signal s from the baseband waveform transmitted by the transmitting end in fig. 1_HFirst part signaling signal with element corresponding to each other

And corresponding first channel information

And a first noise variance estimate

Wherein,

is to a random variable

Estimation of variance of (0. ltoreq. k < M)_H)；

Step S22: low-level signaling signal s in signaling signal s_LAs noise, using a first part of the signalling signalFirst channel information h_AAnd a first noise variance estimate

Demodulating and decoding to obtain high-level signaling b_H；

Step S23: for high-level signaling b_HCode modulation is carried out to obtain a high-level signaling signal s_HThe high-level signaling signal s_HSignalling from the first part

Thereby obtaining a first part of the signalling signal from which the high level signalling signal has been removed

Wherein,

and

the corresponding channel information is still h_AAnd

because of the fact that

Also for random variables

An estimate of variance of (c);

step S24: from high level signalling b_HThe modulation coding parameters, such as bit number and coding modulation mode, of the low-level signaling obtained in step (b) are obtained according to the obtained bit number and coding modulation mode to obtain the number M of complex numbers in the low-level signaling signal_L；

Step S25: after extracting the signaling signal s (M) from the baseband waveform transmitted by the transmitting end in fig. 1_L-M_H) Second part signaling signal with element corresponding to each other

And corresponding second channel information

And a second noise variance estimate

Wherein,

is to a random variable

Estimate of variance of (M)_H≤k＜M_L) (ii) a And

step S26: using a first part of the signalling signal with the higher level signalling signal removed

First channel information h_AThe first noise variance estimation valueAnd a second part signaling signal

Second channel information h_BAnd a second noise variance estimate

Demodulating and decoding to obtain low-level signaling b_L。

Fig. 5 is a schematic block diagram of signal demodulation decoding in an embodiment of the present invention. The signaling demodulation and decoding method in fig. 4 will be specifically described with reference to fig. 5.

As shown in fig. 5, according to the preamble M in the signaling signal s_HThe elements are corresponding to each other, the first part of signaling signals are extracted, the high level signaling is demodulated and decoded, and the high level signaling b is used_HAt least comprises the following components: the bit number of the corresponding low-level signaling and the modulation mode adopted by the low-level signaling, so that the number M of the complex numbers in the low-level signaling signal can be obtained according to the bit number and the modulation mode adopted by the low-level signaling_LFrom (M)_L-M_H) Determining the number of the last several bit elements extracted from the baseband waveform to obtain

h_BAnd

combining signals obtained by the first part of the signalling signal

h_A、

And demodulating and decoding to obtain low-level signaling.

The following describes the technical solution of the present invention by way of an example.

< example 1>

In this embodiment, each physical frame carries three signaling structures, which are: preamble signaling, high level signaling, and low level signaling.

The preamble signaling comprises an overlap indication field with the length of 1 bitS_SPThe superposition indication field S_SPAnd whether the coded modulation for indicating the high-level signaling and the low-level signaling adopts a superposition coding mode or not.

The number of bits contained in the high-level signaling is fixed, and the high-level signaling is 200 bits of information, the adopted coding mode is LDPC code coding, and the adopted modulation mode is QPSK. Then the correspondingly generated high-level signaling signal s_HHaving length, modulation and threshold values, i.e. fixed, high-level signalling signals s_HHas a length of 2400 symbols, i.e., N_H＝200，M_H＝2400。

The number of bits included in the low-level signaling is not necessarily, and may be any number of 200 to 6000 bits, the adopted coding scheme is one or more LDPC codes, and the adopted modulation scheme may be QPSK, 16QAM, or 64 QAM. Then the correspondingly generated low-level signaling signal s_LHas variable length and variable modulation mode. Table 1 lists M under a given QPSK, 16QAM or 64QAM modulation scheme, respectively_LAnd N_LThe corresponding relationship of (1).

Table 1: length of low level signaling signal

Modulation system	N_L	M_L
			QPSK	200 to 2000	4800
QPSK	2001 to 4000	9600
			QPSK	4001 to 6000	14400
16QAM	200 to 2000	2400
			16QAM	2001 to 4000	4800
16QAM	4001 to 6000	7200
			64QAM	200 to 2000	1600
64QAM	2001 to 4000	3200
			64QAM	4001 to 6000	4800

In this embodiment 1, for the coding modulation mode of the advanced signaling, the coding mode is LDPC code coding, and the modulation mode is QPSK, N_H＝200，M_H2400, these modes and values are fixed. In addition, the high level signaling contains a 13-bit long field S_{N_L}To indicate the number of bits N of low level signaling_LAnd a 2-bit long field S_{MOD_L}To indicate low level signallingAnd (4) modulation mode.

In this embodiment 1, specific steps in the following three low-level signaling coded modulation modes are described in detail below for the coded modulation mode of low-level signaling, for example, other modes in table 1 can be obtained in the same manner, and repeated descriptions with the same principle are omitted:

1. the first mode is as follows: the modulation mode of the low-level signaling is 16QAM, N_L＝1800，M_L＝2400。

2. And a second mode: the modulation mode of the low-level signaling is 64QAM, N_L＝1800，M_L＝1600。

3. And a third mode: the modulation mode of the low-level signaling is 64QAM, N_L＝3600，M_L＝3200。

At the transmitting end, when the code modulation of the low-level signaling adopts a mode one, firstly, 200 high-level signaling codes are modulated into a high-level signaling signal s with the length of 2400_HModulating 1800 low-level signaling codes into low-level signaling signal s with length 2400_L. Then, s is_HMultiplied by α_H0.84 and s_LMultiplied by α_LAdding 0.49, a signaling signal s with the length of 2400 is obtained and inserted into the physical frame. Meanwhile, an overlap indication field S in the preamble signaling is used_SPIs arranged to use superposition coding.

When the code modulation of the low-level signaling adopts the mode two, similarly, 200 high-level signaling codes are modulated into the high-level signaling signal s with the length of 2400_HModulating 1800 low-level signaling codes into a low-level signaling signal s of length 1600_L. Since the length 1600 of the low level signaling signal is smaller than the length 2400 of the high level signaling signal, s is not superposition coded but is instead encoded_HAnd s_LThe signaling signals with the length of 1600+2400 ═ 4000 are obtained by direct splicing together and inserted into the physical frame. Meanwhile, an overlap indication field S in the preamble signaling is used_SPThe arrangement is such that superposition coding is not employed.

When the code modulation of the low-level signaling adopts the third mode, firstly, 200 high-level signaling codes are modulated into a high-level signaling signal s with the length of 2400_H3600 low-level signaling codes are adjustedMade as low-level signalling signals s of length 3200_L. Then, s is_HMultiplied by α_H0.87 and s_LThe first 2400 elements of (a) multiply by α_LAdding 0.49, and adding s_LAfter the 3200-2400 ═ 800 elements are spliced, the signaling signal s with the length of 3200 is finally obtained and inserted into the physical frame. Meanwhile, an overlap indication field S in the preamble signaling is used_SPIs arranged to use superposition coding.

At the receiving end, firstly, the preamble signaling is extracted, and the superposition indication field S in the preamble signaling is obtained_SPThereby judging whether the signaling signal adopts a superposition coding mode.

When judging that the superposition coding is not adopted (such as mode two), the receiving end extracts s of the transmitting end from the baseband signal_HAnd analyzing the corresponding high-level signaling signal and the channel information thereof according to the high-level signaling signal. Then, the length and modulation information of low-level signaling signal are extracted from high-level signaling, and s of transmitting end is extracted from baseband signal_LAnd finally, analyzing the low-level signaling according to the corresponding low-level signaling signal and the channel information thereof.

When the judgment is S_SPIndicating that superposition coding (such as mode one and mode three) is adopted, the receiving end extracts a first part of signaling signals with the length of 2400 from the baseband signals

And first channel information h_AAnd a first noise variance estimate

And parses out the high level signaling accordingly. Then, information such as the bit number and modulation scheme of the low-level signaling signal is extracted from the high-level signaling. At the same time will b_HCoded and modulated as s_H。

Taking the first mode as an example, s is the mode_LAnd s_HAre of the same length, so that s can be directly converted into_HFrom

In the process of eliminating the water-soluble organic compound,to obtainAnd according to

And h_AAnd

the low-level signaling is further parsed.

Taking mode three as an example, the receiving end will s_HFromIs eliminated to obtainAnd the receiving end obtains the length of the second part signal signaling 3200-2400-800 by the advanced signaling, so the second part signaling signal with the length of 800 is extracted from the baseband signalAnd its channel information h_BAnd

finally utilize

h_A、

h_BAnd

demodulating and decoding to obtain low-level signaling b_L。

More specifically, in the present embodiment, the steps of demodulation and decoding for high-level signaling and low-level signaling will be described below.

The advanced signaling is obtained by demodulation and decoding, and the method comprises the following steps:

step a 1: signaling the first part

First channel information h_AAnd a first noise variance estimatePerforming demapping to obtain log-likelihood ratio LLR₁Then decoding to obtain the high-level signaling b_H。

The low-level signaling is obtained by demodulation and decoding, and the specific steps of the demodulation and decoding are as follows:

step b 1: the high-level signaling signal s will be eliminated_HOf the first part of the signalling signal

First channel information h_AThe first noise variance estimation value

Performing demapping to obtain a first log-likelihood ratio LLR_1A；

Step b 2: signaling the second part

Second channel information h_BAnd a second noise variance estimate

De-mapping to obtain a second log likelihood ratio LLR_1B；

Step b 3: the obtained first log likelihood ratio LLR_1AAnd a second log-likelihood ratio LLR_1BSplicing to obtain a combined log-likelihood ratio LLR_z(ii) a And

step b 4: for combined log-likelihood ratio LLR_zDecoding to obtain the low-level signalingb_L。

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

1. A signaling coding modulation method based on superposition coding, the physical frame carries high-level signaling b_HAnd low level signalling b_LThe method is characterized by comprising the following steps:

for the high-level signaling b respectively_HAnd said low level signalling b_LCode modulation is carried out to obtain a high-level signaling signal s_HAnd low level signaling signals s_L；

Signaling the high level signaling signal s_HAnd said low level signalling signal s_LPerforming superposition coding according to a preset superposition rule to obtain a signaling signal s; and

combining and modulating the signaling signal s with other signaling and data signals to obtain a baseband waveform of the physical frame;

wherein the low level signaling b_LAt least comprises the following components: the code modulation mode adopted by each service in the physical frame, the high-level signaling b_HAt least comprises the following components: the bit number of the corresponding low-level signaling and the modulation mode adopted by the low-level signaling,

said advanced signalling signal s_HNumber M of medium or plural_HLess than or equal to said low level signalling signal s_LNumber M of medium or plural_L；

Wherein the predetermined overlay rule comprises:

signaling the high level signaling signal s_HAnd said low level signalling signal s_LSuperimposing to obtain a vector containing M_LPlural ofSignalling signals

Wherein,

α_Hand α_LFor a predetermined power factor, α_HAnd α_Lα satisfies the predetermined relationship_HGreater than α_LAnd satisfy

Wherein, the physical frame also carries a preamble signaling, and the preamble signaling contains an overlay indication field S_SP，

The superposition indication field S_SPFor indicating the advanced signalling signal s_HAnd low level signaling signals s_LWhether said predetermined superposition rule is employed for the coded modulation of (2).

2. The signaling code modulation method of claim 1 wherein:

wherein the high level signaling signal s_HThe length, modulation mode and threshold value are fixed;

said low level signalling signal s_LHas variable length and variable modulation mode.

3. A signaling demodulation decoding method based on superposition coding is characterized by comprising the following steps:

the method of claim 1, wherein the first M is extracted from the baseband waveform of the physical frame obtained by the superposition coding-based signaling coding modulation method_HThe first part of signaling signals, corresponding first channel information and a first noise variance estimation value are in one-to-one correspondence with the elements;

taking the low-level signaling signal in the signaling signal as noise, and performing demodulation and decoding by using the first part of signaling signal, the first channel information and the first noise variance estimation value to obtain a high-level signaling;

coding and modulating the advanced signaling to obtain an advanced signaling signal, and eliminating the advanced signaling signal from the first part of signaling signals;

obtaining the number M of complex numbers in the low-level signaling signal according to the bit number and the code modulation mode of the low-level signaling obtained from the high-level signaling_L；

Post (M) for extracting signaling signal of transmitting end from baseband waveform of physical frame obtained by superposition coding-based signaling coding modulation method according to claim 1_L-M_H) The elements correspond to the second part of signaling signals, corresponding second channel information and a second noise variance estimation value one by one; and

and demodulating and decoding by using the first part of signaling signals, the first channel information and the first noise variance estimation value, from which the high-level signaling signals are eliminated, and the second part of signaling signals, the second channel information and the second noise variance estimation value to obtain low-level signaling.

4. The signaling demodulation decoding method as claimed in claim 3, wherein:

the first part of the signaling signal is represented asThe first channel information is expressed as

The first noise variance estimate value is expressed as

Wherein,

is to a random variable

An estimate of variance of (c);

the second part of the signaling signal is represented as

The second channel information is expressed as

The second noise variance estimate value is expressed as

Wherein,

is to a random variable

Is estimated.

5. The signaling demodulation decoding method as claimed in claim 3, wherein:

the first part of the signaling signal from which the high level signaling signal is removed is represented as

Wherein,and the above-mentioned

The corresponding channel information is the first channel information h_AAnd the first noise variance estimate

Indicating the kth signaling signal extracted by the receiving end, α_HIndicating the power factor, h, of an advanced signalling signal when superimposed_kRepresenting randomly variable channel information, s_H，kRepresenting the high level signaling signal at the k-th complex position.

6. The signaling demodulation decoding method as claimed in claim 3, wherein the step of obtaining the advanced signaling through demodulation decoding specifically comprises:

signaling the first part

The first channel information h_AAnd the first noise variance estimate

De-mapping to obtain log-likelihood ratio LLR1, decoding to obtain the high-level signaling b_H。

7. The signaling demodulation decoding method as claimed in claim 3, wherein the step of obtaining the low level signaling through demodulation decoding specifically comprises:

the high level signaling signal s will be cancelled_HOf said first part of the signalling signal

The first channel information h_AThe first noise variance estimate

Performing demapping to obtain a first log-likelihood ratio LLR 1A;

signaling the second partThe second channel information h_BAnd the second noise variance estimate

Performing demapping to obtain a second log likelihood ratio LLR 1B;

splicing the obtained first log-likelihood ratio LLR1A and the obtained second log-likelihood ratio LLR1B to obtain a combined log-likelihood ratio LLrz; and

decoding the combined log-likelihood ratio LLrz to obtain the low-level signaling b_L。

8. The signaling demodulation decoding method as claimed in claim 3, further comprising the steps of:

the receiving end extracts the leading signaling first and obtains the superposition indication field S in the leading signaling_SPBy said superposition indication field S_SPJudging whether the signaling signal adopts superposition coding, and extracting the baseband waveform.