CN116016081A - Non-cooperative digital communication signal blind demodulation method and system based on two-stage blind separation - Google Patents
Non-cooperative digital communication signal blind demodulation method and system based on two-stage blind separation Download PDFInfo
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Abstract
The invention discloses a non-cooperative digital communication signal blind demodulation method and a system based on two-stage blind separation, which relate to the technical field of signal demodulation and comprise the following steps: estimating the carrier frequency of the received uncooperative digital communication signal, and performing down-conversion and oversampling processing on the uncooperative digital communication signal to obtain a baseband sampling sequence; constructing a first observation signal matrix according to the baseband sampling sequence, and separating signals containing the information symbol sequence from the first observation signal matrix by utilizing a blind source separation algorithm; constructing a second observation signal matrix according to signals containing the information symbol sequence, and then obtaining demodulated information symbols from the second observation signal matrix by using a blind source separation algorithm; and finally, mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode. The invention can demodulate the uncooperative digital communication signal under the condition of unknown modulation parameters.
Description
Technical Field
The invention relates to the technical field of signal demodulation, in particular to a non-cooperative digital communication signal blind demodulation method and system based on two-stage blind separation.
Background
In a non-cooperative digital communication system, a receiving end cannot obtain accurate carrier and other modulation parameter information of a transmitting end, and if blind demodulation is to be realized, necessary signal parameters such as carrier frequency, symbol rate, modulation mode and the like need to be estimated from a received signal, and blind carrier synchronization and bit timing synchronization need to be realized. The carrier synchronization and the bit timing synchronization are key technologies of blind demodulation of non-cooperative digital communication, and the advantages and disadvantages of the synchronization performance directly affect the demodulation performance. Carrier synchronization of phase modulated and quadrature amplitude modulated signals is generally achieved by using a phase-locked loop technology, especially a phase-locked loop technology based on decision feedback, and a known signal modulation mode is required in the implementation process, however, in practical applications, the signal modulation mode is generally unknown. Current blind demodulation methods therefore generally require a modulation scheme of the known signal or first assume that it is a certain modulation scheme and then attempt to synchronize. In addition, multipath effect may exist in the transmission process, and the characteristics of non-cooperative communication determine that equalization cannot be performed by using a training sequence, so that the performance of blind demodulation is greatly affected.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a two-stage blind separation-based blind demodulation method and system for non-cooperative digital communication signals, which can demodulate the non-cooperative digital communication signals under the condition of unknown modulation parameters.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a non-cooperative digital communication signal blind demodulation method based on two-stage blind separation, which comprises the following steps:
estimating the carrier frequency of a received non-cooperative digital communication signal, and performing down-conversion processing on the received non-cooperative digital communication signal according to the carrier frequency to obtain a baseband signal;
estimating the symbol rate of the baseband signal, and performing over-sampling on the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence;
transforming the baseband sampling sequence into a P-path sampling sequence, constructing a first observation signal matrix by utilizing the P-path sampling sequence, and then separating signals containing information symbol sequences from the first observation signal matrix by utilizing a blind source separation algorithm;
separating the real part and the imaginary part of a signal containing an information symbol sequence to obtain a real part signal and an imaginary part signal, constructing a second observation signal matrix according to the real part signal and the imaginary part signal, separating the second observation signal matrix by a blind source separation algorithm to obtain a first signal and a second signal, and finally obtaining a demodulated information symbol according to the first signal and the second signal;
and mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode.
Optionally, the estimating the symbol rate of the baseband signal, and performing oversampling on the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence specifically includes:
calculating a sampling rate according to the symbol rate of the baseband signal;
and oversampling the baseband signal at the sampling rate to obtain a baseband sampling sequence.
Optionally, the calculation formula of the sampling rate is f s ＝KR s The method comprises the steps of carrying out a first treatment on the surface of the Wherein f s Represents the sampling rate, R s And (3) representing the symbol rate, wherein K is an oversampling multiple, and K is a positive integer greater than or equal to 2.
Optionally, the value of P is an integer multiple of the oversampling multiple K.
Optionally, the first observation signal matrix is:
wherein P is a positive integer of 1 or more and P or less, m is a positive integer,
for the 1 st sampling sequence,/a>
For the sample sequence of way 2,/o>
For the P-th sampling sequence, each element in the bracket is each sampling point of the baseband sampling sequence, and each element in the bracket is an index; s is(s) b (K) Is the kth sample of the baseband sample sequence.
Optionally, the second observation signal matrix is
Wherein the real part signal is s 1 (n) =real (sig (n)) with an imaginary signal s 2 (n) =imag (sig (n)), real (·) is a real-taking operation, imag (·) is an imaginary-taking operation, sig (n) is a signal comprising a sequence of information symbols, n=0, 1,2, …, m, ….
Optionally, the blind source separation algorithm is a constant-variation adaptive blind source separation algorithm, and the constant-variation adaptive blind source separation algorithm is an EASI algorithm.
Optionally, the separating the signal containing the information symbol sequence from the first observation signal matrix by using a blind source separation algorithm specifically includes:
separating q paths of signals from the first observation signal matrix by using a complex EASI algorithm, and separating signals containing information symbol sequences from the q paths of signals; q is a positive integer less than or equal to P.
Optionally, the separating by using a blind source separation algorithm from the second observation signal matrix to obtain a first signal and a second signal specifically includes:
and separating the first signal and the second signal from the second observation signal matrix by using a real EASI algorithm.
The invention also provides a non-cooperative digital communication signal blind demodulation system based on two-stage blind separation, which comprises the following steps:
the device comprises a carrier frequency and baseband signal determining module, a receiving module and a receiving module, wherein the carrier frequency and baseband signal determining module is used for estimating the carrier frequency of a received uncooperative digital communication signal and carrying out down-conversion processing on the received uncooperative digital communication signal according to the carrier frequency to obtain a baseband signal;
the baseband sampling sequence determining module is used for estimating the symbol rate of the baseband signal and oversampling the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence;
the first blind separation module is used for converting the baseband sampling sequence into a P-path sampling sequence, constructing a first observation signal matrix by utilizing the P-path sampling sequence, and then separating signals containing information symbol sequences from the first observation signal matrix by utilizing a blind source separation algorithm;
the second blind separation module is used for separating the real part and the imaginary part of a signal containing an information symbol sequence to obtain a real part signal and an imaginary part signal, constructing a second observation signal matrix according to the real part signal and the imaginary part signal, separating the first signal and the second signal from the second observation signal matrix by using a blind source separation algorithm, and finally obtaining a demodulated information symbol according to the first signal and the second signal;
and the mapping module is used for mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a two-stage blind separation-based blind demodulation method and a two-stage blind separation-based blind demodulation system for non-cooperative digital communication signals.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a two-stage blind separation-based non-cooperative digital communication signal blind demodulation method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a two-stage blind separation-based non-cooperative digital communication signal blind demodulation method according to a second embodiment of the present invention;
fig. 3 is a constellation diagram of a signal sig (n) containing an information symbol sequence obtained by first-order blind separation according to a second embodiment of the present invention;
FIG. 4 is a diagram of a demodulated information symbol according to a second embodiment of the present invention
Is a constellation diagram of (2);
fig. 5 is a schematic structural diagram of a non-cooperative digital communication signal blind demodulation system based on two-stage blind separation according to a third embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a two-stage blind separation-based non-cooperative digital communication signal blind demodulation method and a two-stage blind separation-based non-cooperative digital communication signal blind demodulation system, which can demodulate MPSK signals and MQAM signals under the condition of unknown modulation parameters.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the method for blind demodulation of non-cooperative digital communication signals based on two-stage blind separation provided by the embodiment of the invention comprises the following steps.
Step 100: estimating the carrier frequency of the received uncooperative digital communication signal, and performing down-conversion processing on the received uncooperative digital communication signal according to the carrier frequency to obtain a baseband signal.
Step 200: estimating the symbol rate of the baseband signal, and performing oversampling on the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence, wherein the method specifically comprises the following steps:
calculating a sampling rate according to the symbol rate of the baseband signal; the calculation formula of the sampling rate is f s ＝KR s The method comprises the steps of carrying out a first treatment on the surface of the Wherein f s Represents the sampling rate, R s And the symbol rate is represented, K is an oversampling multiple, and is a positive integer greater than or equal to 2.
For said baseband signal s at said sampling rate b (t) oversampling to obtain a baseband sample sequence s b (n), where n=0, 1,2, … represents the sequence number of the sampling points of the baseband sampling sequence.
Step 300: and transforming the baseband sampling sequence into a P-path sampling sequence, constructing a first observation signal matrix by utilizing the P-path sampling sequence, and then separating signals containing the information symbol sequence from the first observation signal matrix by utilizing a blind source separation algorithm.
Wherein, the p-th sampling sequence is
P is a positive integer greater than the channel order, P is a positive integer greater than or equal to 1 and less than or equal to P, and m is a positive integer.
First observation signal matrix S b The structure of (2) is as follows:
wherein,,
for the 1 st sampling sequence,/a>
For the sample sequence of way 2,/o>
For the P-th sampling sequence, each element in brackets is a baseband sampling sequence s b (k) Is an index in brackets, e.g. s b (k) K is a non-negative integer, again e.g. s, for the kth sample of the baseband sample sequence b (K) A K-th sample of the baseband sample sequence;
the method for separating the signal containing the information symbol sequence from the first observation signal matrix by using a blind source separation algorithm specifically comprises the following steps:
from the first observation signal matrix S using a blind source separation algorithm b Q-way signals are separated, q is a positive integer less than or equal to P, and signals sig (n) containing information symbol sequences are separated from the q-way signals, wherein n=0, 1,2, …, m and ….
Step 400: and separating the real part and the imaginary part of a signal containing an information symbol sequence to obtain a real part signal and an imaginary part signal, constructing a second observation signal matrix according to the real part signal and the imaginary part signal, separating the second observation signal matrix by a blind source separation algorithm to obtain a first signal and a second signal, and finally obtaining a demodulated information symbol according to the first signal and the second signal.
Wherein the real part signal is s 1 (n) =real (sig (n)) with an imaginary signal s 2 (n) =imag (sig (n)), real (·) is a real-taking operation, and imag (·) is an imaginary-taking operation.
The second observation signal matrix is
The first signal is I (n) and the second signal is Q (n).
The demodulated information symbols are
j represents an imaginary unit.
Step 500: and mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode.
Further, the value of P is an integer multiple of the oversampling multiple K, that is, p=αk, and α is a positive integer greater than or equal to 1.
Further, the blind source separation algorithm is a constant adaptive blind source separation algorithm, namely EASI (Equivariant Adaptive Separation via Independence) algorithm, wherein step 300 adopts a complex EASI algorithm, and step 400 adopts a real EASI algorithm.
Further, the uncooperative digital communication signal is a phase modulated signal or a quadrature amplitude modulated signal.
Example two
The non-cooperative digital communication signal provided by the embodiment of the invention is generated by using a SignalHouse VSG60a, adopts 16QAM modulation and has the carrier frequency of 1GHz. The non-cooperative receiver performs blind demodulation on the non-cooperative digital communication signal by using the two-stage blind separation-based non-cooperative digital communication signal blind demodulation method provided by the embodiment of the invention, and the processing flow is shown in fig. 2, and specifically comprises the following steps:
step 1: estimating a carrier frequency and down-converting; estimating the carrier frequency f of the received uncooperative digital communication signal s (t) by using an envelope square spectrum method c = 0.999946GHz, down-converting the uncooperative digital communication signal s (t) to obtain a baseband signal s b (t)。
Step 2: estimating baseband signal s b Symbol rate R of (t) s The method comprises the steps of carrying out a first treatment on the surface of the Obtaining a baseband signal s by using 4 th power spectrum and 8 th power spectrum estimation of the baseband signal b Symbol rate R of (t) s ＝150kHz；
Step 3: at a sampling rate f s ＝8×R s For baseband signal s b (t) oversampling to obtain a baseband sample sequence s b (n)。
Step 4: constructing a multipath blind source separation model; the baseband sampling sequence s b (n) transform to 8A path sampling sequence, wherein the p-th path sampling sequence is
p is a positive integer of 1 or more and 8 or less, and m is a positive integer.
Step 5: first-stage blind separation; first, a first observation signal matrix S is constructed by 8-path sampling sequences b The structure is as follows:
then, from the first observation signal matrix S, a complex EASI algorithm is used b 5 signals and separating therefrom a signal sig (n) comprising a sequence of information symbols, n=1, 2, …, m, …; fig. 3 is a constellation diagram of a signal sig (n) containing an information symbol sequence obtained by first-order blind separation.
Step 6: IQ splitting; separating the real and imaginary parts of the signal sig (n) to obtain two signals s 1 (n) =real (sig (n)) and s 2 (n) =imag (sig (n)), where real (·) is a real-taking operation and imag (·) is an imaginary-taking operation.
Step 7: secondary blind separation; first, a second observation signal matrix is established
Then, two paths of signals I (n) and Q (n) are separated from the second observation signal matrix S by using a real EASI algorithm, and finally, demodulated information symbols are obtained>
Wherein j represents an imaginary unit; wherein FIG. 3 is the demodulated information symbol +.>
Is a constellation diagram of (a).
Step 8: bit mapping; according to the bit mapping rule of the digital modulation mode, the demodulated information symbols are processed
Mapped to a corresponding bit sequence.
Example III
In order to execute the corresponding method of the above embodiment to achieve the corresponding functions and technical effects, a non-cooperative digital communication signal blind demodulation system based on two-stage blind separation is provided below.
As shown in fig. 5, the two-stage blind separation-based non-cooperative digital communication signal blind demodulation system includes:
the carrier frequency and baseband signal determining module 1 is configured to estimate a carrier frequency of a received uncooperative digital communication signal, and perform down-conversion processing on the received uncooperative digital communication signal according to the carrier frequency, so as to obtain a baseband signal.
And the baseband sampling sequence determining module 2 is used for estimating the symbol rate of the baseband signal and oversampling the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence.
The first blind separation module 3 is configured to transform the baseband sampling sequence into a P-way sampling sequence, construct a first observation signal matrix by using the P-way sampling sequence, and then separate signals containing an information symbol sequence from the first observation signal matrix by using a blind source separation algorithm.
And the second blind separation module 4 is configured to separate the real part and the imaginary part of the signal containing the information symbol sequence to obtain a real part signal and an imaginary part signal, construct a second observation signal matrix according to the real part signal and the imaginary part signal, then separate the first signal and the second signal from the second observation signal matrix by using a blind source separation algorithm, and finally obtain a demodulated information symbol according to the first signal and the second signal.
And the mapping module 5 is used for mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A non-cooperative digital communication signal blind demodulation method based on two-stage blind separation is characterized by comprising the following steps:
estimating the carrier frequency of a received non-cooperative digital communication signal, and performing down-conversion processing on the received non-cooperative digital communication signal according to the carrier frequency to obtain a baseband signal;
estimating the symbol rate of the baseband signal, and performing over-sampling on the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence;
transforming the baseband sampling sequence into a P-path sampling sequence, constructing a first observation signal matrix by utilizing the P-path sampling sequence, and then separating signals containing information symbol sequences from the first observation signal matrix by utilizing a blind source separation algorithm;
separating the real part and the imaginary part of a signal containing an information symbol sequence to obtain a real part signal and an imaginary part signal, constructing a second observation signal matrix according to the real part signal and the imaginary part signal, separating the second observation signal matrix by a blind source separation algorithm to obtain a first signal and a second signal, and finally obtaining a demodulated information symbol according to the first signal and the second signal;
and mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode.
2. The method for blind demodulation of a non-cooperative digital communication signal based on two-stage blind separation according to claim 1, wherein the estimating the symbol rate of the baseband signal and oversampling the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence specifically includes:
calculating a sampling rate according to the symbol rate of the baseband signal;
and oversampling the baseband signal at the sampling rate to obtain a baseband sampling sequence.
3. The method for blind demodulation of non-cooperative digital communication signals based on two-stage blind separation according to claim 2, wherein the calculation formula of the sampling rate is f s ＝KR s The method comprises the steps of carrying out a first treatment on the surface of the Wherein f s Represents the sampling rate, R s And (3) representing the symbol rate, wherein K is an oversampling multiple, and K is a positive integer greater than or equal to 2.
4. A method for blind demodulation of a non-cooperative digital communication signal based on two-stage blind separation according to claim 3, wherein the value of P is an integer multiple of the oversampling multiple K.
5. The method for blind demodulation of non-cooperative digital communication signals based on two-stage blind separation according to claim 3, wherein the first observation signal matrix is:
wherein P is a positive integer of 1 or more and P or less, m is a positive integer,
for the 1 st sampling sequence,/a>
For the sample sequence of way 2,/o>
For the P-th sampling sequence, each element in the bracket is each sampling point of the baseband sampling sequence, and each element in the bracket is an index; s is(s) b (K) Is the kth sample of the baseband sample sequence.
6. The method for blind demodulation of non-cooperative digital communication signals based on two-stage blind separation according to claim 5, wherein the second observation signal matrix is
Wherein the real part signal is s 1 (n) =real (sig (n)) with an imaginary signal s 2 (n) =imag (sig (n)), real (·) is a real-taking operation, imag (·) is an imaginary-taking operation, sig (n) is a signal comprising a sequence of information symbols, n=0, 1,2, …, m, ….
7. The method for blind demodulation of a non-cooperative digital communication signal based on two-stage blind separation according to claim 1, wherein the blind source separation algorithm is a constant adaptive blind source separation algorithm, and the constant adaptive blind source separation algorithm is an EASI algorithm.
8. A method for blind demodulation of non-cooperative digital communication signals based on two-stage blind separation according to claim 1 or 7, wherein the separating the signal containing the information symbol sequence from the first observation signal matrix by using a blind source separation algorithm specifically comprises:
separating q paths of signals from the first observation signal matrix by using a complex EASI algorithm, and separating signals containing information symbol sequences from the q paths of signals; q is a positive integer less than or equal to P.
9. The method for blind demodulation of a non-cooperative digital communication signal based on two-stage blind separation according to claim 1 or 7, wherein the separating by a blind source separation algorithm from the second observation signal matrix is performed to obtain a first signal and a second signal, and specifically includes:
and separating the first signal and the second signal from the second observation signal matrix by using a real EASI algorithm.
10. A two-stage blind separation-based blind demodulation system for non-cooperative digital communication signals, comprising:
the device comprises a carrier frequency and baseband signal determining module, a receiving module and a receiving module, wherein the carrier frequency and baseband signal determining module is used for estimating the carrier frequency of a received uncooperative digital communication signal and carrying out down-conversion processing on the received uncooperative digital communication signal according to the carrier frequency to obtain a baseband signal;
the baseband sampling sequence determining module is used for estimating the symbol rate of the baseband signal and oversampling the baseband signal according to the symbol rate of the baseband signal to obtain a baseband sampling sequence;
the first blind separation module is used for converting the baseband sampling sequence into a P-path sampling sequence, constructing a first observation signal matrix by utilizing the P-path sampling sequence, and then separating signals containing information symbol sequences from the first observation signal matrix by utilizing a blind source separation algorithm;
the second blind separation module is used for separating the real part and the imaginary part of a signal containing an information symbol sequence to obtain a real part signal and an imaginary part signal, constructing a second observation signal matrix according to the real part signal and the imaginary part signal, separating the first signal and the second signal from the second observation signal matrix by using a blind source separation algorithm, and finally obtaining a demodulated information symbol according to the first signal and the second signal;
and the mapping module is used for mapping the demodulated information symbols into corresponding bit sequences according to the bit mapping rule of the digital modulation mode.
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