CN108848046A - A kind of matched filtering method and device suitable for narrow-band communication system - Google Patents
A kind of matched filtering method and device suitable for narrow-band communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
- H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
- H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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Abstract
The invention discloses a kind of matched filtering method and device suitable for narrow-band communication system, this method includes：It obtains and receives signal；The reversion sequence for receiving signal and training sequence modulated signal is subjected to computing cross-correlation, obtains estimated value of channel impulse response, and only there are multiple proportions between the total number after the sequence of default training sequence interpolation default value for estimated value of channel impulse response；By estimated value of channel impulse response and signal progress matched filtering is received, obtains maximum output signal-to-noise ratio.By the above-mentioned means, training sequence length can be saved, lowers communication overhead, be particularly suitable for the narrow-band communication system of GMSK modulation.Moreover, estimated value of channel impulse response is only between the total number after the sequence of default training sequence interpolation default value, there are multiple proportions.In other words estimated value of channel impulse response is only related with interpolation default value, so that making the complexity of channel estimation can be greatly reduced.
Description
Technical field
The present invention relates to technical field of data processing, and in particular to a kind of matched filtering side suitable for narrow-band communication system
Method and device.
Background technique
Narrow-band communication system, especially various Internet of things system are all narrowband systems, the narrow bandwidth of narrowband systems, transmission
Rate is low, but reliability requirement is high.Narrow-band communication system and 4G, the broadband connections such as 5G are compared, and advantage is narrow bandwidth,
So the radio frequency bottom of receiver is made an uproar, (it is exactly ambient noise that bottom, which is made an uproar) is low, and receiving sensitivity can be improved, and expands covering and saves eventually
Hold power；Difficult point is the narrow bandwidth due to system, and the anti-frequency shift capabilities of receiver are poor, if there is big frequency shift (FS) is sent out
It is raw, then it receives useful signal and just deflects away from except effective bandwidth easily very much.
Though narrow-band communication system bandwidth is narrow, wireless carrier signal equally experienced multipath fading, shadow fading and frequency
Selective intensity etc., so that the propagation path between transmitter and receiver is extremely complex.Wireless channel have it is very big with
Machine, this just proposes very big challenge to the design of receiver.It needs to carry out channel in the relevant detection of single-carrier system
Estimation and compensation, the precision of channel estimation will directly affect the performance of whole system.In order to accurately restore to send out in receiving end
The transmission signal at end is penetrated, people resist influence of the multipath effect to transmission signal using various measures, channel estimation technique
The information for needing to know wireless channel is realized, as the impulse of the order of channel, Doppler frequency shift and multidiameter delay or channel is rung
Parameters should be waited.Therefore, channel parameter estimation is also a key technology of narrow band width wireless communication systems.
Present wide-band communication system, such as 4G, 5G are all using 10 to obtain good channel estimation effect
The OFDM symbol of left and right does training sequence, there is 1024 subcarriers in each OFDM symbol, since training sequence is very long, thus
Obtain good channel estimation effect, the problem of this method is that training sequence is too long, accounts for too big expense, reduces system
Efficiency；In narrow-band communication system, due to being limited to very low traffic rate and payload expense, it is impossible to as broadband connections system
System like that, designs long training sequence specially to realize channel estimation, because expense does not allow.
Channel estimation method divides from the type of input data, can be divided into time domain and frequency domain two major classes method.Frequency domain
Method is mainly for multicarrier system；Time domain approach is suitable for all single carriers and multicarrier system, by referring to signal
Or the statistical property of data is sent, estimate the fading coefficients of each multipath component in fading channel.
In common multicarrier narrow-band communication system, mainly take frequency domain estimation method, this channel estimation methods by
In using FFT (Fast Fourier Transform (FFT))/IFFT (inverse fast Fourier transform), so estimated accuracy is high, but complexity
It is very high；Time-domain channel estimating method is simple, but estimated accuracy is not high.
Summary of the invention
The purpose of the present invention is to provide a kind of matched filtering methods and device suitable for narrow-band communication system, to solve
The problem of certainly existing channel estimation training sequence is too long, cannot achieve the channel estimation in narrowband.
To achieve the above object, technical solution of the present invention provides a kind of matched filtering suitable for narrow-band communication system
Method, this method include：
It obtains and receives signal, wherein receiving signal is to transmitting signal by the first treated signal, and transmitting signal is
It is adjusted to the signal of signal and information to be sent being together to form, modulated signal is：To default training sequence interpolation default value
Sequence after, by gaussian minimum shift keying (Gaussian Filtered Minimum Shift Keying, referred to as
GMSK it) modulates, the modulated signal of acquisition；
The reversion sequence for receiving signal and modulated signal is subjected to computing cross-correlation, obtains estimated value of channel impulse response,
And only there are multiples between the total number after the sequence of default training sequence interpolation default value for estimated value of channel impulse response
Relationship；
By estimated value of channel impulse response and signal progress matched filtering is received, obtains maximum output signal-to-noise ratio.
The invention has the advantages that：By short training sequence after interpolation default value, after GMSK modulation, obtain
Take modulated signal.It will be launched after modulated signal and information combination to be launched by wireless channel, after superimposed noise,
And then it is received the reception of machine antenna.And receiver passes through the first processing upon receipt of the signal, obtains receiving signal.It will receive
The reversion sequence of signal and modulated signal carries out cross-correlation, obtains estimated value of channel impulse response.Channel impulse response is estimated again
Evaluation and reception signal carry out matched filtering, obtain maximum output signal-to-noise ratio, realize channel compensation.By the above-mentioned means, can be with
Training sequence length is saved, communication overhead is reduced, is particularly suitable for the narrow-band communication system of GMSK modulation.Moreover, Channel Impulse
Only there are multiple proportions between the total number after the sequence of default training sequence interpolation default value for response estimation value.In other words
Estimated value of channel impulse response is only related with interpolation default value, so that making the complexity of channel estimation can be greatly reduced.
To achieve the above object, technical solution of the present invention provides a kind of matched filtering suitable for narrow-band communication system
Device, the matched filter that should be suitable for narrow-band communication system include：
Acquiring unit obtains and receives signal, wherein and receiving signal is to transmitting signal by the first treated signal,
Emitting signal is the signal being together to form for being adjusted to signal and information to be sent, and modulated signal is：To in default training sequence
After the sequence for inserting default value, by GMSK modulation, the modulated signal of acquisition；
Processing unit, the reversion sequence for that will receive signal and modulated signal carry out computing cross-correlation, obtain channel punching
Hit response estimation value, and estimated value of channel impulse response only with the total number after the sequence of default training sequence interpolation default value
Between there are multiple proportions；
By estimated value of channel impulse response and signal progress matched filtering is received, obtains maximum output signal-to-noise ratio.
The invention has the advantages that：By short training sequence after interpolation default value, after GMSK modulation, obtain
Take modulated signal.It will be launched after modulated signal and information combination to be launched by wireless channel, after superimposed noise,
And then it is received the reception of machine antenna.And receiver passes through the first processing upon receipt of the signal, obtains receiving signal.It will receive
The reversion sequence of signal and modulated signal carries out cross-correlation, obtains estimated value of channel impulse response.Channel impulse response is estimated again
Evaluation and reception signal carry out matched filtering, obtain maximum output signal-to-noise ratio, realize channel compensation.By the above-mentioned means, can be with
Training sequence length is saved, communication overhead is reduced, is particularly suitable for the narrow-band communication system of GMSK modulation.Moreover, Channel Impulse
Only there are multiple proportions between the total number after the sequence of default training sequence interpolation default value for response estimation value.In other words
Estimated value of channel impulse response is only related with interpolation default value, so that making the complexity of channel estimation can be greatly reduced.
Detailed description of the invention
Fig. 1 is that a kind of matched filtering method process suitable for narrow-band communication system provided in an embodiment of the present invention is illustrated
Figure；
Fig. 2 is a kind of matched filter structural representation suitable for narrow-band communication system provided in an embodiment of the present invention
Figure；
The schematic diagram of Fig. 3 matched filter provided by the invention；
Fig. 4 is the signal after reception signal provided by the invention and the reversion sequence progress computing cross-correlation of modulated signal
Figure.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
The embodiment of the present invention 1 provides a kind of matched filtering method flow diagram suitable for narrow-band communication system.Tool
Body is as shown in Figure 1, this method may include：
Step 110, it obtains and receives signal.
Specifically, receiving signal is to the transmitting signal obtained in advance by the first treated signal.Emitting signal is
It is adjusted to the signal of signal and information to be sent being together to form.Here modulated signal is：Transmitting terminal is to default training sequence
After the sequence of interpolation default value, after GMSK modulation, the modulated signal of acquisition.And modulated signal is really launch party and connects
Debit's joint consultation is good.So recipient also will appreciate that corresponding modulated signal when sender generates modulated signal.This
Its importance will appear herein below in point.
Here carrying out the first processing to transmitting signal may include following process：
Launch party will constitute transmitting signal after modulated signal and information common combination to be sent, be sent to wireless channel
On.After multipath channel decline is superimposed with noise again, into receiver antenna.Receiver antenna declines to by multipath channel
Signal after being superimposed with noise again carries out down-converted and ADC sampling, and final obtain receives signal.
Step 120, the reversion sequence for receiving signal and modulated signal is subjected to computing cross-correlation, obtains channel impulse response
Estimated value.
And the estimated value of channel impulse response finally obtained is only and after the sequence of default training sequence interpolation default value
There are multiple proportions between total number.In other words estimated value of channel impulse response is only related with interpolation number (i.e. default value),
To make the complexity of channel estimation can be greatly reduced.
Step 130, estimated value of channel impulse response and reception signal are subjected to matched filtering, obtain maximum output noise
Than.Fig. 3 gives the schematic diagram of matched filter, and wherein s (t)+n (t) is input signal, and H (w) is matched filtering function, s0
(t)+n0It (t) is then output signal.
Training sequence length range is 2byte-4byte.In a specific example, it is assumed that short training sequence byte long
Degree is 2byte.That is 16 bytes：
Training=[1 01110000100010 0]
After the training sequence to be added to the sequence of default value (such as 3 bytes), sequence is obtained：
Training1=[1,000 0,000 1,000 1,000 1,000 0,000 0,000 0,000 0,000 1,000 0000
0000 0000 1000 0000 0000]
That is, insertion 000 constitutes sequence as above after each byte.Then GMSK modulation is carried out to sequence Training1, obtained
Modulated signal：
Tseq=[1 j of-1 j-1-j of-j 1-j of-1 j-1 j, 1-j 1]
It certainly, is equally known in recipient in the modulated signal Tseq of transmitter direction acquisition.
The reversion sequence for receiving signal and modulated signal is subjected to computing cross-correlation, really says to receive in recipient and believe
Number computing cross-correlation is carried out with the reversion sequence of the modulated signal of recipient side, shown in specific Fig. 4.Fig. 4 be receive signal with
The reversion sequence of modulated signal carries out the schematic diagram after computing cross-correlation.
Specific formula is as shown in formula 1：
R=Tseqc [-]*× r (t) (formula 1)
Wherein, r (t) is to receive signal, Tseqc [-]*For the reversion sequence of modulated signal Tseq.
Cross correlation results are as shown in formula 2：When receiving signal and modulated signal is perfectly aligned, it may appear that cross-correlation mountain peak
Peak, as a result as shown in (2)：
Wherein, R is estimated value of channel impulse response.Certainly, this is ideal training sequence cross-correlation function, and actually
Reception signal with the sequence of modulated signal may not be to be aligned.It receives in signal and further comprises additive white Gaussian noise.That
, receive signal in training sequence part can be expressed as：
TTseq=Tseq × h+ ω (formula 3)
Wherein, TTseqFor the practical training sequence received in signal.Tseq is the training sequence emitted in signal, and h is pair
Sequence sum after the sequence of default training sequence interpolation default value, ω is additive white Gaussian noise.
It is obtained when the reverse signal for receiving training sequence part and modulated signal in signal carries out cross-correlation：
However, any signal and white Gaussian noise cross-correlation (convolution) result are all 0, so formula 4 can further letter
It turns to：
By the available accurate estimated value of channel impulse response R of formula 5, the length of R no longer with actual channel length L phase
It closes, it is only related to h.And h is practical only related with interpolation default value.It is also assumed that being related (interpolation multiple with interpolation multiple
As default value add 1 after numerical value).For example, original series are 16, the default value of interpolation is 3, and interpolation multiple is 4, then
H is 64.N is training sequence value.
And concentrated on due to the signal energy of GMSK modulation signal in a symbol of front, so, channel can be rushed
Hit response length L be simplified to it is equal with the interpolation multiple q of training sequence.And the length of channel impulse response is set to q.Optionally,
General q can be set as 4,8,16 or 32, and corresponding, default value value can be 3,7,15 or 31.That is believe
Road shock response length is determined by q.For example, when short training sequence byte length is 2byte, q=16.It needs to illustrate
Be, once the value interval of q=16, n will between 0, ± 1, ± 2, ± 3, ± 4, ± 5, ± 6, ± 7 value.Similar,
If the value interval of q=32, n are value between 0, ± 1, ± 2, ± 3, ± 4, ± 5, ± 6, ± 7 ... ± 15.And for example
1, -1 or 5 etc..Wherein, as n=0, local training sequence is aligned with the training sequence received in signal；Or n<When 0,
Local training sequence receives the training sequence in signal in advance；Or n>When 0, local training sequence lag receives the instruction in signal
Practice sequence.
After having estimated value of channel impulse response, matched filtering can be carried out with input signal.
Wherein, input signal r (t)=s (t)+n (t), n (t) are noise, and n (t) can be exemplified as ω in the present embodiment.
Output signal is s0(t)+n (t), when the tap coefficient of filter is the complex conjugate function of input signal, i.e. k
(t)=ks*(t0-t).The signal-to-noise ratio of output signal is maximum.
Certainly, this be under theoretical case be to rush input signal and actual channel and when actually realizing matched filtering
Product calculation is done after hitting the conjugation reversion of response estimation value R.
Y=r × R*[-] (formula 6)
Matched filtering can be completed.This is also a kind of most simplified matched filtering algorithm, and particularly suitable for narrowband system
The GMSK of system is demodulated.To simplify the explanation, this matched filtering process of formula 6 can be realized with following code, specifically such as
Under：
Matched filter provides maximum signal to noise ratio and exports the optimum sampling moment as a result, namely matched filter, with most
Small cost obtains optimum performance.And this section of program is utilized, it also may be implemented to extract out the sequence of interpolation, specific implementation process will
Excessive introduction is not done.
A kind of matched filtering method suitable for narrow-band communication system provided in an embodiment of the present invention, short training sequence is passed through
After crossing interpolation default value, after GMSK modulation, modulated signal is obtained.After modulated signal and information combination to be launched
Launched by wireless channel, after superimposed noise, and then is received the reception of machine antenna.And receiver is receiving the letter
By the first processing after number, obtain receiving signal.The reversion sequence for receiving signal and modulated signal is subjected to cross-correlation, obtains letter
Road shock response estimated value.Estimated value of channel impulse response and reception signal are subjected to matched filtering again, obtain maximum output letter
It makes an uproar and compares, realize channel compensation.By the above-mentioned means, training sequence length can be saved, communication overhead is reduced, is particularly suitable for
The narrow-band communication system of GMSK modulation.Moreover, estimated value of channel impulse response only with default training sequence interpolation default value
There are multiple proportions between total number after sequence.In other words estimated value of channel impulse response is only related with interpolation default value,
To make the complexity of channel estimation can be greatly reduced.
Embodiment 2
Corresponding with embodiment 1, the embodiment of the invention also provides a kind of matching filters suitable for narrow-band communication system
Wave apparatus, specifically as shown in Fig. 2, the device includes：Acquiring unit 201 and processing unit 202.
Acquiring unit 201, obtain receive signal, wherein receive signal be to transmitting signal by first treated letter
Number, transmitting signal is the signal being together to form for being adjusted to signal and information to be sent, and modulated signal is：To default training sequence
After the sequence of interpolation default value and after information to be launched is combined, modulated using GSMK, the modulated signal of acquisition；
Processing unit 202, the reversion sequence for that will receive signal and modulated signal carry out computing cross-correlation, obtain channel
Shock response estimated value, and estimated value of channel impulse response only with it is total after the sequence of default training sequence interpolation default value
There are multiple proportions between number；
By estimated value of channel impulse response and signal progress matched filtering is received, obtains maximum output signal-to-noise ratio.
Optionally, the first processing is carried out to transmitting signal, specifically included：
After Signal averaging noise being emitted, sampled by down-converted and ADC.
Optionally, the byte length range for presetting training sequence is 2byte-4byte.
Optionally, estimated value of channel impulse response expression formula is as follows：
Wherein, R is estimated value of channel impulse response, and h is to the sequence after the sequence of default training sequence interpolation default value
Column sum, n is training sequence value.The interpolation multiple of training sequence is the default value+1 of default training sequence interpolation.
Optionally, interpolation default value is a numerical value in following：3,7,15 or 31, corresponding interpolation default value adds
Interpolation multiple after 1 is 4,8,16 or 32.
Function performed by each component matched filter provided in an embodiment of the present invention suitable for narrow-band communication system
It can have been described in detail in above-described embodiment 1, therefore not be described in detail here.
A kind of matched filter suitable for narrow-band communication system provided in an embodiment of the present invention, short training sequence is passed through
After crossing interpolation default value, after GMSK modulation, modulated signal is obtained.After modulated signal and information combination to be launched
Launched by wireless channel, after superimposed noise, and then is received the reception of machine antenna.And receiver is receiving the letter
By the first processing after number, obtain receiving signal.The reversion sequence for receiving signal and modulated signal is subjected to cross-correlation, obtains letter
Road shock response estimated value.Estimated value of channel impulse response and reception signal are subjected to matched filtering again, obtain maximum output letter
It makes an uproar and compares, realize channel compensation.By the above-mentioned means, training sequence length can be saved, communication overhead is reduced, is particularly suitable for
The narrow-band communication system of GMSK modulation.Moreover, estimated value of channel impulse response only with default training sequence interpolation default value
There are multiple proportions between total number after sequence.In other words estimated value of channel impulse response is only related with interpolation default value,
To make the complexity of channel estimation can be greatly reduced.
Embodiment 3
In addition, being stored thereon with computer program the embodiment of the invention also provides a kind of computer readable storage medium
Instruction, the program instruction realize the method and step of above-described embodiment 1 when being executed by processor.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of matched filtering method suitable for narrow-band communication system, which is characterized in that the method includes：
It obtains and receives signal, wherein the receptions signal is to transmitting signal by the first treated signal, and the transmitting is believed
It number is the signal of modulated signal and information to be sent being together to form, the modulated signal is：To default training sequence interpolation
After the sequence of default value, by gaussian minimum shift keying GMSK modulation, the modulated signal of acquisition；
The reversion sequence of the reception signal and the modulated signal is subjected to computing cross-correlation, obtains channel impulse response estimation
Value, and the estimated value of channel impulse response only with the total number after the sequence of the default training sequence interpolation default value it
Between there are multiple proportions；
The estimated value of channel impulse response and the reception signal are subjected to matched filtering, obtain maximum output signal-to-noise ratio.
2. being specifically included the method according to claim 1, wherein carrying out the first processing to the transmitting signal：
After the transmitting Signal averaging noise, sampled by down-converted and ADC.
3. the method according to claim 1, wherein the byte length range of the default training sequence is
2byte-4byte。
4. method according to claim 1 to 3, which is characterized in that estimated value of channel impulse response expression formula is as follows：
Wherein, R is estimated value of channel impulse response, and h is total to the sequence after the sequence of default training sequence interpolation default value
Number, n is training sequence value.
5. method according to claim 1-3, which is characterized in that the interpolation default value is one in following
A numerical value：3,7,15 or 31.
6. a kind of matched filter suitable for narrow-band communication system, which is characterized in that described device includes：
Acquiring unit obtains and receives signal, wherein and the receptions signal is to pass through the first treated signal to transmitting signal,
The transmitting signal is the signal being together to form for being adjusted to signal and information to be sent, and the modulated signal is：To default instruction
After the sequence for practicing sequence interpolation default value, by gaussian minimum shift keying GMSK modulation, the modulated signal of acquisition；
Processing unit obtains letter for the reversion sequence of the reception signal and the modulated signal to be carried out computing cross-correlation
Road shock response estimated value, and the estimated value of channel impulse response only sequence with the default training sequence interpolation default value
There are multiple proportions between total number after column；
The estimated value of channel impulse response and the reception signal are subjected to matched filtering, obtain maximum output signal-to-noise ratio.
7. device according to claim 6, which is characterized in that carry out the first processing to the transmitting signal, specifically include：
After the transmitting Signal averaging noise, sampled by down-converted and ADC.
8. according to the method described in claim 6, it is characterized in that, the byte length range of the default training sequence is
2byte-4byte。
9. according to the described in any item devices of claim 6-8, which is characterized in that estimated value of channel impulse response expression formula is such as
Under：
Wherein, R is estimated value of channel impulse response, and h is total to the sequence after the sequence of default training sequence interpolation default value
Number, n is training sequence value.
10. according to the described in any item devices of claim 6-8, which is characterized in that the interpolation default value is in following
One numerical value：3,7,15 or 31.
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Application publication date: 20181120 |