CN111698022B - Satellite communication system based on narrow-band multi-channel communication interference suppression - Google Patents
Satellite communication system based on narrow-band multi-channel communication interference suppression Download PDFInfo
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- CN111698022B CN111698022B CN202010404801.XA CN202010404801A CN111698022B CN 111698022 B CN111698022 B CN 111698022B CN 202010404801 A CN202010404801 A CN 202010404801A CN 111698022 B CN111698022 B CN 111698022B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0066—Interference mitigation or co-ordination of narrowband interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
Abstract
A satellite communication system based on narrow-band multi-channel communication interference suppression, a navigation satellite and a relay station are in communication connection with each other in a multi-channel mode to carry out relay transmission on a combined signal with a plurality of component signals, the navigation satellite at least comprises a regeneration module, an inversion module and a cancellation module, the regeneration module is configured to carry out synthesis regeneration on the component signals based on a symbol track and a modulation type to generate a synthesized signal, and the inversion module is configured to carry out inversion processing on the synthesized signal to generate an inverted copy under the condition that the synthesized signal is determined to be an interference signal; the cancellation module is configured to receive a copy of the combined signal and to superimpose the inverted copy and the copy of the combined signal to generate a first stage interference suppressed signal.
Description
The invention relates to a divisional application of a satellite communication system based on narrow-band interference suppression, which has the application number of 201910005961.4, the application date of 2019, 1 month and 3 days and the application type of the invention.
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a satellite communication system based on narrow-band interference suppression.
Background
The global satellite navigation system mainly works to provide positioning, speed measurement, time service or navigation services for military and civil use, is widely applied to various weapon platforms, and becomes a common guidance means in accurate guidance weapons. Satellite signals are particularly susceptible to various types of interference because they reach the ground at a much lower power than the thermal noise power of the receiver. Although the satellite navigation system has a certain level of anti-jamming capability by using spread spectrum communication, in the case of high-level jamming, for example, the anti-jamming capability of the system must be improved by means of anti-jamming technology. The existing receiver mostly adopts an airspace anti-interference mode, can effectively inhibit broadband interference and narrowband interference, but the number of interference inhibition is limited by the number of array elements of an antenna. The commonly used techniques for resisting narrowband interference at present mainly include two types, i.e., time domain and frequency domain. The time domain anti-interference technology is simple to realize, but the time domain anti-interference algorithm needs long-time iteration to reach a stable state, and the fast-varying interference cannot be tracked. Compared with the time domain anti-interference technology, the frequency domain anti-interference technology does not need a convergence process, can quickly respond to the fast time-varying interference, is insensitive to an interference model, and is more suitable for fast time-varying narrow-band interference suppression. For example, in order to improve the satellite communication quality, a series of narrowband interference suppression measures based on, for example, the time domain or the frequency domain are proposed. The basic idea of adopting the method for resisting the narrow-band interference in the frequency domain is as follows: the main information contained in the signal is retained in the phase spectrum of the frequency spectrum, and the amplitude spectrum only represents the power of the signal, so that the signal can be effectively recovered by only retaining most phase information of the signal. When the spectrum width occupied by the high-power narrow-band interference is far smaller than the spectrum bandwidth occupied by the spread spectrum signal, the interference spectrum is set to zero, and then the narrow-band interference suppression can be realized. For example, the suppression of narrowband interference can be realized by using DFT transform, DFT has the advantages of multiple interference suppression, no need of convergence process and simple structure, but the frequency spectrum of interference leaks due to windowing processing, thereby resulting in incomplete interference suppression.
Meanwhile, space spectrum resources are limited, and the data transmission rate of satellite communication is improved at the cost of sacrificing the bandwidth of information, so that the satellite communication continuously and greatly impacts the spectrum resources. In order to avoid the mutual interference of the same frequency band signals caused by the transmission of the same frequency band signals by a plurality of transmitters, the receiver can not adjust the correct information. In order to solve the existing problems, a spectrum fixed allocation mode is often adopted, that is, the usage right of a fixed frequency band is attributed to a specific user and other users or services are prohibited from accessing the divided spectrum. The fixed frequency band allocation mode effectively solves the interference generated in the use of the radio. However, with the rapid development of wireless technology, more and more services need to access to spectrum, and the original static allocation management mode of spectrum makes spectrum resources not fully utilized, so that spectrum resources are increasingly in shortage. Therefore, research on a narrowband communication technology with high spectrum utilization, fast transmission rate, and long transmission distance has become necessary.
Patent document No. CN102904604B discloses a method and an apparatus for suppressing narrowband interference, the apparatus including: the adaptive filter module, the fast Fourier transform module, the narrow-band interference suppression module and the fast Fourier inverse transform module, the method is as follows: predicting the discrete sequence obtained by sampling according to a self-adaptive algorithm to obtain a narrowband interference prediction signal; multiplying the narrowband interference prediction signal by a factor K to obtain a prediction factor signal, and subtracting the prediction factor signal from the received signal to obtain a first signal; transforming the first signal to a frequency domain, and performing frequency domain notching processing on the first signal on the frequency domain; and converting the first signal subjected to the frequency domain notch into a second signal on a time domain, and inputting the second signal to a demodulator of the spread spectrum signal to finish the narrow-band interference suppression. The invention multiplies the time domain of the signal by a window function to carry out windowing processing before carrying out fast Fourier transform processing, the multiplication operation in the time domain is equivalent to convolution processing in the frequency domain, and therefore, the windowing effect is only to reduce side lobes generated by interference sources. The performance that the windowing process can improve depends on the frequency of the interferer. When the interference source is not located at a certain subcarrier frequency, spectrum leakage occurs, and narrowband interference affects all adjacent subcarriers. And it does not consider canceling intercarrier interference. The invention does not consider the separation of each component signal when the frequencies of the signals are overlapped, and can not improve the frequency spectrum utilization rate of the satellite communication system.
Disclosure of Invention
The word "module" as used herein describes any type of hardware, software, or combination of hardware and software that is capable of performing the functions associated with the "module".
In view of the shortcomings of the prior art, the present invention provides a satellite communication system based on narrowband interference suppression, wherein a navigation satellite and a relay station are in communication connection with each other in a multi-channel manner to perform relay transmission on a combined signal having a plurality of component signals, the navigation satellite at least comprises an interference identification module, a windowing module, a separation module and a regeneration module, and in case of frequency overlapping between the component signals, the navigation satellite is configured to process the combined signal as follows: the windowing module is configured to generate a windowed processed signal after limiting the frequency of the combined signal based on a windowing process; the interference identification module is configured to process the nth power of the signal based on the window to determine a modulation characteristic of at least one constituent signal and a symbol rate of its corresponding carrier; the separation module is configured to resample the window processed signal based on m times of the symbol rate and generate a resampled signal under the condition that the window processed signal generates at least one continuous wave based on the nth power processing, and determine at least one symbol track and at least one modulation type according to the resampled signal; the regeneration module is configured to synthetically regenerate the constituent signals based on the symbol trajectories and the modulation type to generate a synthesized signal.
According to a preferred embodiment, the navigation satellite further comprises a cancellation module and a reversal module, and in case that the synthetic signal is determined to be an interference signal, the navigation satellite is configured to process the synthetic signal as follows: the inversion module is configured to invert the composite signal to generate an inverted copy; the cancellation module is configured to receive a copy of the combined signal and to superimpose the inverted copy and the copy of the combined signal to generate a first stage interference suppressed signal.
According to a preferred embodiment, the navigation satellite further comprises a signal preprocessing module and an interference cancellation module, and the navigation satellite is configured to process the first-stage interference suppression signal as follows: the signal pre-processing module is configured to establish a first complex sinusoid and a second complex sinusoid and to determine frequency components of the first stage interference suppression signal to separate frequency content of the interference signal. The interference cancellation module is configured to: introducing intercarrier interference in such a way that said first interference suppression signal is multiplied with said first complex sinusoid to generate an offset signal; acquiring an interference elimination signal and acquiring a time domain sampling sample of the interference elimination signal according to a subcarrier frequency zero setting mode; and eliminating the inter-carrier interference according to a mode of executing multiplication processing on the time domain sampling samples and the second complex sinusoid.
According to a preferred embodiment, the interference cancellation module obtains the interference cancellation signal as follows: aligning the frequency of an interference signal with the center of a subcarrier frequency of a communication channel and acquiring the frequency delta f of a fast Fourier transform filter bank closest to the frequency of the interference signal; sequentially performing windowing processing and fast Fourier transform processing on the offset signal to generate a frequency domain signal; and setting the frequency delta f of the fast Fourier transform filter bank corresponding to the subcarrier frequency to zero.
According to a preferred embodiment, the signal pre-processing module is configured to: configuring a filter bank having a number of different filtering levels, and each filtering level comprising at least a low-pass channel and a high-pass channel, the low-pass channel and the high-pass channel each configuring at least one set of discrete wavelet transformers, wherein: acquiring sub-bands of a plurality of different frequency bands based on a plurality of filtering levels of the filter bank; the signals contained in the sub-bands can be decomposed into a plurality of different time-frequency spaces through discrete wavelet transform processing.
According to a preferred embodiment, the relay station comprises at least a coding module and a first modulation module, and is configured to modulate the signal as follows: the encoding module is configured to perform encoding processing on the signal to obtain an encoded signal; the first modulation module is configured to perform serial-to-parallel conversion processing on the encoded signal to generate a first branch code stream and a second branch code stream, wherein: under the condition that the first branch code stream performs delay processing so that the first branch code stream and the second branch code stream are spaced by a set code element period, the first branch code stream sequentially performs first-stage filtering processing and first-stage modulation processing to obtain a first modulation signal, and the second branch code stream sequentially performs the first-stage filtering processing and second-stage modulation processing to obtain a second modulation signal; the first modulation signal and the second modulation signal are jointly subjected to the second-stage modulation processing to obtain a third modulation signal, wherein the third modulation signal is subjected to the second-stage filtering processing to complete the modulation processing. The first stage of filtering processing is performed by a raised cosine roll-off filter and the second stage of filtering processing is performed by a band pass filter. After the signal is subjected to the first-stage filtering processing, a periodic continuation phenomenon occurs in a signal frequency spectrum due to a subsequent modulation resampling process, intersymbol interference is generated finally, sidelobe interference exists in a frequency range of the modulated signal, the quality of the modulated signal is reduced, and the error rate is increased. The second stage of filtering processing can reduce the size of a side lobe in a frequency range to a specified decibel range, and can eliminate intersymbol interference. The third modulated signal generated by the modulation has a lower average power ratio peak value than the prior art. And discontinuity of any phase of the first branch code stream and the second branch code stream can be effectively and smoothly removed through the first-stage filtering processing.
According to a preferred embodiment, the encoding process comprises at least the following steps: the signal is processed by BCH coding to generate a BCH code, and the BCH code and the information sending frame jointly form a plurality of information subframes with set bits according to a zero code supplementing mode; and under the condition that the information subframe is subjected to synchronous scrambling processing, RS coding processing and convolutional coding processing in sequence to obtain processed data, the processed data at least forms a complete modulation data frame together with carrier synchronization bits, a guide sequence, a unique code and a frame tail.
According to a preferred embodiment, the relay station further includes a filtering module, a second modulation module and a frequency conversion module, and the relay station further processes the signal as follows: the coded signal is transmitted to a first modulation module at a set code rate, is modulated and then is transmitted to the filtering module at a first carrier frequency; the filtering module is configured to perform filtering processing on the signal received by the filtering module and transmit the signal to the second modulation module; the second modulation module transmits the signal received by the second modulation module to the frequency conversion module at a second carrier frequency, wherein the frequency conversion module is configured to convert the signal received by the second modulation module to a set radio frequency output frequency.
According to a preferred embodiment, the navigation satellite further comprises a demodulation module configured to calculate an average power of a signal to determine whether an interference signal is present in a subband, the demodulation module configured to demodulate an output signal of the interference cancellation module, wherein: the frequency of the first complex sinusoid is Δ f and the frequency of the second complex sinusoid is- Δ f.
According to a preferred embodiment, the filtering module performs filtering processing on the received signal in a manner that a first filter performs the first-stage filtering processing on the first branch code stream and the second branch code stream, and a second filter performs the second-stage filtering processing on the third modulation signal; under the condition that the third modulation signal is transmitted to the second modulation module through the filtering module, the second modulation module transmits the signal received by the second modulation module to the frequency conversion module at a second carrier frequency; the first filter is a raised cosine roll-off filter and the second filter is a band-pass filter; the first-stage modulation processing is quadrature modulation processing, and the second-stage modulation processing is in-phase modulation processing.
The invention has the beneficial technical effects that:
(1) in the iterative process, each narrow-band interference signal is aligned with the center of the subcarrier frequency of a communication channel, so that the generation of the inter-carrier interference is caused. The narrowband interference will no longer be carried by the signal after the narrowband interference is aligned with the subcarrier frequency, and then the intercarrier interference is removed from the signal. Therefore, before decoding, the signal removes all narrow-band interference and any potential side lobes, thereby eliminating spectral leakage.
(2) The invention can eliminate the intersymbol interference through the digital shaping filter, further can meet the Nyquist characteristic without the intersymbol interference, and simultaneously can smooth the waveform, further can accelerate the attenuation speed outside the frequency band of the modulation signal, and improve the frequency spectrum utilization rate. The modulation envelope can be made more rounded by processing through a band pass filter.
(3) The invention can receive signals with frequency overlapping, detect and filter interference signals contained in the signals and effectively improve the utilization rate of frequency spectrum resources.
Drawings
FIG. 1 is a schematic diagram of the modular connectivity of a preferred satellite communications system of the present invention;
FIG. 2 is a schematic diagram of a preferred relay station of the present invention;
FIG. 3 is a schematic diagram of a modulation process flow of a first preferred modulation module according to the present invention;
FIG. 4 is a schematic diagram of a modular structure of a preferred navigation satellite of the present invention;
fig. 5 is a process flow diagram of a preferred interference cancellation module of the present invention;
FIG. 6 is a block diagram of the encoding of a preferred RS code of the present invention;
FIG. 7 is a block diagram of the encoding of a preferred convolutional code of the present invention;
FIG. 8 is a process flow diagram of a preferred encoding module of the present invention;
FIG. 9 is a schematic view of a modular structure of another preferred navigation satellite of the present invention; and
FIG. 10 is a schematic view of the processing flow of the combined signal by the preferred navigation satellite of the present invention.
List of reference numerals
1: the navigation satellite 2: relay station
101: the interference identification module 102: the interference cancellation module 103: demodulation module
104: the signal preprocessing module 105: analog-to-digital conversion module 106: windowing module
107: the separation module 108: the regeneration module 109: delay module
110: the cancellation module 111: the reverse module 201: coding module
202: the first modulation module 203: the filtering module 204: second modulation module
205: the frequency conversion module 102 a: offset logic circuit 102 b: a first multiplication unit
102 c: window function circuit 102 d: first fast Fourier transform unit
102 e: the interference cancellation circuit 102 f: fast Fourier inverse transform circuit
102 g: the correction circuit 102 h: second multiplying unit
102 i: second fast fourier transform unit 2 a: first relay station
2 b: the second relay station 203 a: first filter 203 b: second filter
202 a: first modulator 202 b: second modulator 202 c: third modulator
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
Example 1
The invention provides a satellite communication system based on narrow-band interference suppression, which at least comprises at least one navigation satellite 1 and a plurality of relay stations 2 which are communicated with each other. For example, as shown in fig. 1, the multichannel satellite communication system includes a navigation satellite 1, a first relay station 2a, and a second relay station 2 b. The first relay station 2a may transmit the data signal it receives to the navigation satellite 1, and then relay it to the second relay station 2b through the navigation satellite 1. Similarly, the second relay station 2b may relay the data signal received by the second relay station to the first relay station 2a via the navigation satellite 1. The first relay station 2a and the second relay station 2b may individually have their own gateways, and all the gateways may be communicatively coupled to each other through a common network.
Preferably, as shown in fig. 2, the relay station 2 at least includes an encoding module 201, a first modulation module 202, a filtering module 203, a second modulation module 204 and a frequency conversion module 205. The encoding module 201 is configured to encode the original data information received by the relay station 2 and transmit the encoded digital signal to the first modulation module 202 according to a set code rate. The first modulation module 202 is used for modulating the digital signal to convert to a set first carrier frequency. The digital signal modulated by the first modulation module 202 is transmitted to the filtering module 203 for filtering. The digital signal filtered by the encoding module 201 of the filtering module 203 is transmitted to the second modulation module 204 to be modulated again so as to be converted into the set second carrier frequency. The digital signal having the second carrier frequency is transmitted to the frequency conversion module 205. The frequency conversion module 205 is configured to convert the digital signal processed by the second modulation module 204 to a set frequency for transmission so as to be uploaded to the navigation satellite 1.
Preferably, the encoding module 201 may be configured to encode the raw data information based on a circular encoding or a convolutional encoding. The first modulation module 202 and the second modulation module 204 may modulate the digital signal based on a combination of one or more of digital phase modulation, multilevel digital phase modulation, phase shift keying modulation, quadrature phase keying modulation, and offset quadrature phase shift keying modulation. The filtering module 203 can be a digital shaping filter, and can eliminate intersymbol interference through the digital shaping filter, so that the nyquist characteristic of no intersymbol interference can be satisfied, and simultaneously, the waveform can be smoothed, so that the out-of-band attenuation speed of a modulation signal can be accelerated, and the spectrum utilization rate is improved.
Preferably, the frequency conversion module 205 may be a programmable phase-locked loop chip, and may convert the modulation signal to a set radio frequency output frequency range by configuring parameters of a frequency division register of the phase-locked loop chip, and may divide the available frequency spectrum into a plurality of carrier channels at equal frequency intervals by setting a frequency division interval. Dividing the frequency spectrum into multiple channels can improve the utilization rate of the frequency spectrum. For example, if the available frequency band is 100.0000MHz to 100.0100MHz, the frequency band may be divided into 100 channels if the frequency division interval is 100 Hz. The narrowband signal can be obtained through the frequency conversion module. Thereby realizing narrow-band multi-channel communication between the relay station 2 and the navigation satellite 1.
Preferably, the relay station 2 can send the original data to the first modulation module 202 for modulation processing at a code rate of 600bps after the encoding processing of the encoding module. The first modulation module 202 transmits the carrier frequency of 15KHz to the filtering module 203 for filtering. The second modulation module 204 re-modulates the 15KHz modulated signal so that it is transmitted to the frequency conversion module 205 at a carrier frequency of 10.685 MHz.
Preferably, as shown in fig. 3, the first modulation module 202 is further configured to perform modulation processing on the coded signal processed by the coding module 201 according to the following operation mode:
s1: and the coded signal is subjected to serial-to-parallel conversion processing to generate a first branch code stream and a second branch code stream, wherein the first branch code stream and the second branch code stream are separated from each other by a set code element period in a delay processing mode.
Specifically, after the encoded signal is processed by serial-to-parallel conversion to generate a first branch code stream and a second branch code stream, the code rate of each of the first branch code stream and the second branch code stream is one half of the code rate of the encoded signal. The first branch code stream may be subjected to signal transmission in a serial transmission manner, and the second branch code stream may be subjected to signal transmission in a parallel transmission manner. The set symbol period may be one-half symbol period. After any one of the first branch code stream or the second branch code stream is subjected to time delay processing of half a code element period, the first branch code stream and the second branch code stream can be staggered by half the code element period.
S2: under the condition that the first branch code stream is subjected to the delay processing of half a symbol period, the first branch code stream and the second branch code stream are respectively transmitted to the filtering module 203 for filtering processing in a one-to-one corresponding manner, wherein the filtering module 203 at least comprises a first filter 203a and a second filter 203b, and the first branch code stream and the second branch code stream are transmitted to the first filter 203a for filtering processing in a one-to-one corresponding manner. The first stage filtering process may be performed by the first filter 203 a.
Specifically, the first filter 203a is a digital shaping filter. The digital shaping filter can be a raised cosine roll-off filter, and the shaping waveform of the coded signal can be changed by controlling the roll-off coefficient, so that the influence caused by sampling timing errors can be reduced. The frequency response h (f) of the raised cosine roll-off filter can be expressed by the following formula:
wherein, the corresponding time domain waveform function is:
wherein the symbol period Ts＝1/2fN，fNIs the quintesla frequency. Alpha is a roll-off factor which determines the shape of H (f), alpha is in [0, 1 ]]Taking a value between. When α is large, the time domain waveform attenuates the block and the oscillation fluctuation is small, which is advantageous for reducing the influence of intersymbol interference and timing error, but the occupied band becomes wide, the band use ratio decreases, and the influence of the in-band noise on the signal increases accordingly. When alpha is smaller, the frequency band utilization rate is increased, the influence of in-band noise is weakened, but the waveform oscillation fluctuation is increased, the influence on intersymbol interference and timing error is increased, and finally the error rate is improved. Preferably, the roll-off factor α is selected to be 0.5, and the order of the digital shaping filter is set to 32.
S3: the first branch code stream and the second branch code stream after being filtered by the first filter 203a are respectively transmitted to the first modulation module 202 for modulation processing.
Specifically, the first modulation module 202 includes at least a first modulator 202a, a second modulator 202b, and a third modulator 202 c. The first modulator 202a is a quadrature modulator and the second modulator 202b and the third modulator 202c are both in-phase modulators. The first branch code stream is transmitted to the first modulator 202a for quadrature modulation processing to obtain a first modulation signal, and the second branch code stream is transmitted to the second modulator for in-phase modulation processing to obtain a second modulation signal. The first modulation signal and the second modulation signal are both uniformly transmitted to the third modulator 202c for in-phase modulation processing to obtain a third modulation signal. A first level of modulation processing may be performed by the first modulator 202 a. The second stage modulation process may be performed by second modulating it 202b and the third modulator 202 c.
S4: the third modulated signal is transmitted to the second filter 203b to be filtered to complete the modulation process of the encoded signal.
Specifically, the second filter 203b is a band-pass filter that allows signals within a specific frequency range to pass through, and can attenuate signals outside the specific frequency range to a very low level. The coded signal is based on the modulation resampling process of the modulation module, so that the signal frequency spectrum can generate period prolongation to generate intersymbol interference, and further the error code probability of the modulation module is increased. Preferably, the order of the band pass filter may be set to 64 orders. The modulation envelope can be made more rounded by processing through a band pass filter. The second stage filtering process may be performed by the second filter 203 b.
Example 2
This embodiment is a further improvement of embodiment 1, and repeated contents are not described again.
Referring again to fig. 1, the first relay station 2a may transmit the first signal to the navigation satellite 1, and then relay the first signal to the second relay station 2b through the navigation satellite 1. When the second relay station 2b transmits the second signal to the navigation satellite, the second relay station 2b can simultaneously receive the echo of the second signal and the first signal as a combined signal. Likewise, the first relay station 2a can simultaneously receive the echo of the first signal and the second signal as a combined signal. The first relay station 2a and the second relay station 2b can cancel interference due to echo by an echo cancellation method, and demodulation of the first signal and the second signal can be facilitated by canceling echo. The first signal and the second signal are interfered by different environments and different degrees in the transmission process, so that the combined signal received by the relay station at least needs to be transmitted, the echo of the transmitted signal and the noise base. The transmission signal to be transmitted refers to a first signal or a second signal to be transmitted between the first relay station and the second relay station. The noise floor refers to the sum of all noise sources and unwanted signals in the communication system, i.e. any other signal than the transmitted signal.
Preferably, as shown in fig. 4, the navigation satellite 1 comprises at least a signal preprocessing module 104. The signal pre-processing module 104 includes several filters to enable decomposition of the combined signal, analysis, or suppression of interfering signals. The signal pre-processing module 104 is configured to process the combined signal as follows:
s1: the combined signal is subjected to a fast fourier transform process to determine the frequency content of the combined signal. For example, the signal preprocessing module 104 may include a fast fourier transformer to which the combined signal is transmitted to enable fast fourier transformation of the combined signal. The fast fourier transformer may add the product of the combined signal samples to a complex sinusoid of frequency to obtain a frequency domain representation of the combined signal, wherein the processing of the fast fourier transformer may be represented as:
xnare digital samples of the combined signal. N is the total number of samples being processed.
S2: the output signal after the fast Fourier transform processing is decomposed to obtain a plurality of decomposed signals of different time-frequency spaces. In particular, the output signal may be transmitted into a filter bank, which may comprise several different filtering stages. Each filtering level may include a low pass channel and a high pass channel, and both the low pass channel and the high pass channel are configured with a set of discrete wavelet transformers, respectively. The output signal can be divided into a plurality of sub-bands with different frequency bands through different filtering grades, and signals contained in different sub-bands can be decomposed into a plurality of different time-frequency spaces through discrete wavelet transform processing of a discrete wavelet transformer, so that the time-frequency content of the transmitted signal can be separated from the frequency content of the interference signal.
Preferably, referring again to fig. 4, the navigation satellite 1 comprises at least an interference identification module 101, an interference cancellation module 102 and a demodulation module 103. The navigation satellite 1 may have a signal receiving module, such as an antenna, and may be capable of receiving signals transmitted by the relay station 2 or other signal terminals. The interference identification module 101 is configured to perform interference detection on signals in a plurality of different subbands output by the signal preprocessing module 104, so as to determine frequencies corresponding to all interference sources existing in the combined signal. The interference cancellation module 102 is configured to perform, for example, filtering processing on the interference source detected and determined by the interference identification module, so as to achieve interference cancellation. The demodulation module 103 is configured to demodulate the signal for further transmission. Preferably, the interference identification module 101 may calculate the average power of the combined signal and set a standard threshold. When the actual power of the combined signal analyzed and determined by the interference identification module is higher than the set standard threshold, the existence of interference can be judged. The setting of the criterion threshold can be determined in advance by advance simulation of the interfering signal.
Preferably, as shown in fig. 5, the interference cancellation module 102 may include an offset logic circuit 102a, a first multiplication unit 102b, a window function circuit 102c, a first fast fourier transform unit 102d, an interference cancellation circuit 102e, an inverse fast fourier transform circuit 102f, and a signal correction circuit 102 g. The offset logic 102a is configured to align the frequency of the interfering signal with the frequency center of the subcarrier of the communication channel, and is capable of determining the difference between the frequency of the interfering signal and the center frequency of the fft filter bank frequency afAnd the offset logic may determine one or more of the fft filter bank frequencies that are closest to the frequency of the interfering signal. Preferably, the offset logic circuit is also able to create a first complex sinusoid on the received signals for performing the multiplication of the analog signals with each other in the first multiplication unit 102 b. The frequency of the first complex sinusoid may be represented by- Δ f, and the first complex sinusoid may be represented by the following equation
(N-0, 1, …, N-1). FsRepresenting the sampling frequency. N is the number of fast fourier transform sample points. The first multiplying unit 102b may receive the first complex sinusoid from the offset logic and a combined signal, wherein the combined signal comprises sampled samples of the interfering signal. The first multiplying unit 102b multiplies the first complex sinusoid with the sampled samples to obtain an offset signal. At the same time, intercarrier interference can also be introduced into the first multiplying unit 102b by multiplying the first complex sinusoid with the sampled samples.
Preferably, the window function circuit 102c is configured to receive the output of the first multiplying unit 102b and perform windowing thereon. The window function circuit may window the signal using, for example, a hanning window function, a rectangular window function, or a butley window function. The output of the first multiplying unit 102b can be limited to the main lobe by the windowing process. The first fast fourier transform unit 102d can receive the output of the window function circuit 102c and perform a fast fourier transform process thereon to generate a frequency domain signal. The interference cancellation circuit 102e can receive the demodulated fast fourier transform signal processed by the first fast fourier transform unit 102d, and the interference cancellation circuit 102e can remove the subcarrier frequency determined by the offset logic circuit 102a in calculating Δ f from the fast fourier transform signal to obtain an interference cancellation signal. Specifically, for the subcarrier frequency involved in the Δ f calculation process, the interference cancellation circuit 102e can set the frequency of the fast fourier transform filter bank corresponding to the subcarrier frequency to zero. Since the frequency of the interfering signal has already been shiftedThe shift logic 102a processes to align with the frequency center of the subcarrier while the frequency of the current subcarrier is set to zero by the interference cancellation circuit 102e, so that the interference signal is cancelled. Preferably, the interference canceled signal can be transmitted to inverse fast fourier transform circuit 102f and subjected to an inverse fast fourier transform process to produce time domain sample samples. Preferably, the correction circuit 102g is configured to generate a ramp signal having a frequency equal to Δ f, which may be passed through a second complex sinusoid
(N-0, 1, …, N-1). So that the correction circuit 102g can eliminate the inter-carrier interference. Specifically, the second complex sinusoid generated by the correction circuit 102g and the output signal generated by the inverse fast fourier transform circuit 102f are simultaneously transmitted to the second multiplication unit 102h for multiplication processing to eliminate the intercarrier interference. Preferably, the output signal of the second multiplying unit 102h can be transmitted to the second fast fourier transform unit 102i for fast fourier transform processing again to demodulate the signal. The output signal of the second fast fourier transform unit 102i is finally transmitted to the demodulation module 103 for decoding. Preferably, the first fast fourier transform unit 102d and the second fast fourier transform unit 102i together define a fast fourier transform filter bank.
Preferably, in an iterative process, each narrowband interfering signal is aligned with the center of the subcarrier frequency of the communication channel, which results in the generation of intercarrier interference. The narrowband interference will no longer be carried by the signal after the narrowband interference is aligned with the subcarrier frequency, and then the intercarrier interference is removed from the signal. Therefore, before decoding, the signal removes all narrow-band interference and any potential side lobes, thereby eliminating spectral leakage.
Example 3
This embodiment is a further improvement of the foregoing embodiment, and repeated contents are not described again.
Preferably, when the navigation satellite 1 communicates with the relay station 2, the navigation satellite 1 may also receive a combined signal composed of a plurality of constituent signals. The combined signal may comprise a demand signal and an interference signal, the demand signal being a signal that needs to be relayed via the navigation satellite 1. The navigation satellite 1 further comprises an analog-to-digital conversion module 105, a windowing module 106, a separation module 107, a regeneration module 108, a delay module 109, a cancellation module 110 and a inversion module 111. Multichannel transmission is established between the navigation satellite 1 and the relay station 2, signals transmitted in the multichannel transmission can have frequency overlapping, and therefore the utilization rate of frequency spectrum resources can be improved.
Preferably, the navigation satellite 1 is configured to perform the separation process on the combined signal having the frequency overlap as follows:
s1: the windowing module 106 performs windowing to obtain a windowed signal, and the interference identification module 101 performs nth power processing on the windowed signal to determine the modulation characteristics of the constituent signals and the symbol rates of the carriers corresponding to the constituent signals.
Specifically, the analog-to-digital conversion module 105 is configured to perform analog-to-digital conversion on the combined signal received by the navigation satellite to convert the analog signal into a digital signal. The combined signal received by the navigation satellite 1 is first transmitted to the analog-to-digital conversion module 105 for analog-to-digital conversion to generate a digital signal. The windowing module 106 can receive the digital signal generated by the processing of the analog-to-digital conversion module 105, and the windowing module 106 can limit the bandwidth of the digital signal or pay attention to a part of the digital signal to ensure that it can effectively process the frequency spectrum part of the demand signal, thereby generating a windowed signal. The interference identification module 101 may receive the window processed signal and identify and determine its signal components. For example, the interference identification module 101 may be configured to perform an nth power process on the window-processed signal until it is converted into a continuous wave. When the window processing signal includes a plurality of different signals, for example, two demand signals and three interference signals may be included, and the different signals may form a plurality of different nth power processes due to different modulation characteristics, that is, the window processing signal may obtain one continuous wave when the 4 th power process is performed, and may obtain another continuous wave when the 8 th power process is performed. A window-processed signal having 5 kinds of signals can generate 5 continuous waves independent of each other with different powers of n in 5. The nth power processing is performed in multiples of 2, that is, 2 th power processing, 4 th power processing, 6 th power processing, and the like can be performed. Preferably, when the nth power processing is performed, the processing is performed by incrementing each stage by 2 stages. For example, in the case where a continuous wave is not generated when performing the power-of-2 processing, the power-of-4 processing, the power-of-6 processing, the power-of-8 processing, and the like are sequentially performed. Preferably, the modulation characteristics of the constituent signals are determined at least by one or more of phase offset, frequency offset, bandwidth and time delay of the constituent signals. The phase offset, frequency offset, bandwidth and time delay can be determined by the waveform of the continuous wave formed after the nth power processing.
Preferably, the symbol rate of the window processed signal may be determined based on an nth power process on the window processed signal. For example, when signals are subjected to nth power processing, the phases of the symbols are correlated with each other or the correlation between the phases of the symbols is eliminated, so that a continuous wave represented by a single frequency in a frequency domain can be formed.
S2: in the case where the window processed signal produces at least one continuous wave based on an nth power process, the separation module 107 resamples the window processed signal in a manner based on an m-fold of the symbol rate to generate a resampled signal and determines at least one symbol track and at least one modulation type therefrom.
Preferably, when the interference identification module 101 determines that the combined signal has a plurality of component signals, the window processed signal may be transmitted to the separation module 107, and the separation module may resample the window processed signal at m times the symbol rate based on the determined modulation characteristic. I.e. the separation module 107 samples its received signal at a higher rate and is thus able to derive the symbol trajectory, the shaping factor and the modulation type. The shaping factor may be used to evaluate the degree of concentration or dispersion of the signal energy. For example, the shaping factor may be a root raised cosine spectrum of the window processed signal. Preferably, the different constituent signals are capable of generating a plurality of continuous waves during different nth power processes. For example, when a signal is modulated using a binary phase keying method, a continuous wave can be generated at the time of a power of two. When the signal is modulated by using the quadrature phase shift keying method, a continuous wave can be generated in the fourth power processing. Thus, the modulation type of the signal can be determined according to the number of squarings of the nth power process.
Preferably, the regeneration module 108 synthesizes each of the constituent signals based on at least one symbol track and at least one modulation type to generate a synthesized signal, in a case where the synthesized signal is determined to be an interference signal, the inversion module 111 inverts the synthesized signal to generate an inverted copy, the delay module 109 delays and transmits the copy of the synthesized signal to the cancellation module 110, and the cancellation module 110 superposes the inverted copy and the copy of the synthesized signal to cancel the interference signal, so as to obtain a first-stage interference suppression signal.
Preferably, as shown in fig. 9, the first-stage interference suppression signal can be transmitted to the signal preprocessing module 104 for processing to separate the time-frequency content of the transmission signal from the frequency content of the interference signal. The first-stage interference suppression signal processed by the signal preprocessing module 101 can be transmitted to the interference cancellation module 102 to further cancel the interference signal.
Example 4
This embodiment is a further improvement of the foregoing embodiment, and repeated contents are not described again.
Preferably, as shown in fig. 8, the encoding module 201 is further configured to perform encoding processing on the signal as follows:
s1: and combining a BCH code generated after the signal is subjected to BCH coding processing and a transmission information frame into an information subframe with set bits, wherein when the bit length of the information subframe does not meet the set bit length, the information subframe is supplemented in a mode of supplementing 0 codes.
Specifically, a signal with a bits is subjected to BCH (b, a) coding to obtain a BCH code output with b bits, and the BCH code with b bits and a transmitted information frame are combined into an information subframe with c bits. For example, b may be set to 31 and c may be set to 223.
Preferably, the generator polynomial of the BCH code may be represented by the formula g (x) ═ x10+x9+x8+x6+x5+x3And + 1.
S2: the information sub-frame is processed by synchronous scrambling. When a continuous long 0 code or a continuous 1 code is transmitted in digital communication, it is interfered by an electromagnetic field existing in a spatial transmission channel, thereby generating an error code. The scrambling code is an n-pseudo random sequence, the occurrence times of 0 codes and 1 codes can be balanced by adding linear feedback of the n-sequence and data, the data can be converted into approximate white noise, and the fading and the error rate of space signals are reduced. Specifically, the scrambling code period of the synchronous scrambling process may be set to 215-1, polynomial 1+ X14+X15The n-sequence with the start register value of 1001_0101_0000_000 scrambles all the framed data.
S3: and sequentially carrying out RS coding and convolutional coding on the sub-frames subjected to scrambling processing. For example, specific parameters of RS encoding can be configured as follows: the code length n is 255, the supervision end k is 223, and the polynomial g (x) x is generated8+x4+x3+x2+1. The convolutional code has 1 input port and 2 output ports, and the two output ports respectively correspond to a generator polynomial g1(x) ═ x6+x5+x4+x3+1 and g2(x) ═ x6+x4+x3+x1+1。
Preferably, fig. 6 shows a coding block diagram of the RS code, where the polynomial h (x) of the input information is removed g (x) to obtain a remainder r (x), and r (x) is spliced to the tail of h (x) to obtain an output codeword. Specifically, h (x) is directly output through the gate A, h (x) enters the RS check circuit, the output of the check circuit is disconnected at the moment, and after all 223 elements enter the check circuit, data stored in a plurality of registers are RS check bits. At this time, the output of the check circuit is opened, the check bit is output, and r (x) is spliced to the tail of h (x), so that 255-bit RS encoding data is formed.
Preferably, fig. 7 shows an encoding block diagram of a convolutional code, where the code rate is 3/4 bits/symbol, the constraint length is 7 bits, and the concatenation vector G1 is 1111001 and G2 is 1011011. The output is determined by the puncturing scheme, where C1: 101, C2: 110, 1 denotes a symbol that is transmitted and 0 denotes a symbol that is not transmitted. The shift register is used for storing bit information, and the output code stream sequence enters the shift register and is divided into two branches at the same time, and two paths of XOR operation are respectively carried out. The polynomial of the first branch is g1(x), and the polynomial of the second branch is g2 (x). The first branch and the second branch can feed the operation results into the punching unit, wherein the operation results of the two branches alternately enter the punching unit, the punching unit shifts and divides the continuous 6-bit data into a group, and the entering sequence of each group is C1(1)C2(1)C1(2)C2(2)C1(3)C2(3) … are provided. Finally, the puncturing unit performs convolutional coding 3/4 puncturing output on a group of data according to the puncturing scheme, and the sequence of the output is C1(1)C2(1)C2(2)C1(3)…。
S4: and the data generated after the convolutional coding, the carrier synchronization bit, the pilot sequence, the unique code and the frame tail form a complete modulation data frame. For example, the data generated after convolutional coding can be combined with 320 bit carrier synchronization bits, 160 bit pilot sequence, 64 bit unique code and 64 bit frame tail to form a complete modulated data frame. By organically combining the coding modes, the formed combined coding mode has low error rate, high confidentiality and high spectrum utilization rate.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (8)
1. A satellite communication system based on the suppression of narrowband multichannel communication interference, a navigation satellite and a relay station are communicatively connected to each other in a multichannel manner for relaying a combined signal having a plurality of constituent signals,
the navigation satellite includes at least a regeneration module, an inversion module, and a cancellation module, the regeneration module configured to synthesize and regenerate the constituent signals based on a symbol trajectory and a modulation type to generate a synthesized signal,
in the case that the composite signal is determined to be an interference signal, the inversion module is configured to invert the composite signal to generate an inverted copy; the cancellation module is configured to receive a copy of the combined signal and to superimpose the inverted copy and the copy of the combined signal to generate a first level interference suppressed signal, and the navigation satellite comprises at least an interference identification module, a windowing module, a separation module, and a delay module, and is configured to process the combined signal in the following manner if the constituent signals have frequency overlap with each other:
the windowing module (106) is configured to generate a windowed processed signal after defining the frequency of the combined signal based on a windowing process;
the interference identification module is configured to process the nth power of the signal based on the window to determine a modulation characteristic of at least one constituent signal and a symbol rate of its corresponding carrier;
the separation module is configured to resample the window processed signal based on m times of the symbol rate and generate a resampled signal under the condition that the window processed signal generates at least one continuous wave based on the nth power processing, and determine at least one symbol track and at least one modulation type according to the resampled signal;
the delay module delays the replica of the combined signal to a cancellation module, the navigation satellite further comprises a signal preprocessing module and an interference cancellation module, and the navigation satellite is configured to process the first-stage interference suppression signal as follows:
the signal preprocessing module is configured to establish a first complex sinusoid and a second complex sinusoid and determine frequency components of the first stage interference suppression signal to separate frequency content of the interference signal;
the interference cancellation module is configured to:
introducing intercarrier interference in a manner that the first stage interference suppression signal is multiplied by the first complex sinusoid to generate an offset signal;
acquiring an interference elimination signal and acquiring a time domain sampling sample of the interference elimination signal according to a subcarrier frequency zero setting mode;
and eliminating the inter-carrier interference according to a mode of executing multiplication processing on the time domain sampling samples and the second complex sinusoid.
2. The satellite communication system of claim 1, wherein the interference cancellation module obtains the interference cancellation signal as follows:
aligning the frequency of an interference signal with the center of a subcarrier frequency of a communication channel and acquiring the frequency delta f of a fast Fourier transform filter bank closest to the frequency of the interference signal;
sequentially performing windowing processing and fast Fourier transform processing on the offset signal to generate a frequency domain signal;
and setting the frequency delta f of the fast Fourier transform filter bank corresponding to the subcarrier frequency to zero.
3. The satellite communication system of claim 2, wherein the signal pre-processing module is configured to:
configuring a filter bank having a number of different filtering levels, and each filtering level comprising at least a low-pass channel and a high-pass channel, the low-pass channel and the high-pass channel each configuring at least one set of discrete wavelet transformers, wherein:
acquiring sub-bands of a plurality of different frequency bands based on a plurality of filtering levels of the filter bank;
the signals contained in the sub-bands can be decomposed into a plurality of different time-frequency spaces through discrete wavelet transform processing.
4. The satellite communication system of claim 3, wherein the relay station comprises at least a coding module and a first modulation module, and wherein the relay station is configured to modulate the signal as follows:
the encoding module is configured to perform encoding processing on the signal to obtain an encoded signal;
the first modulation module is configured to perform serial-to-parallel conversion processing on the encoded signal to generate a first branch code stream and a second branch code stream, wherein:
under the condition that the first branch code stream performs delay processing so that the first branch code stream and the second branch code stream are spaced by a set code element period, the first branch code stream sequentially performs first-stage filtering processing and first-stage modulation processing to obtain a first modulation signal, and the second branch code stream sequentially performs the first-stage filtering processing and second-stage modulation processing to obtain a second modulation signal;
the first modulation signal and the second modulation signal are jointly subjected to the second-stage modulation processing to obtain a third modulation signal, wherein the third modulation signal is subjected to second-stage filtering processing to complete the modulation processing.
5. The satellite communication system according to claim 4, wherein said encoding process comprises at least the steps of:
the signal is processed by BCH coding to generate a BCH code, and the BCH code and the information sending frame jointly form a plurality of information subframes with set bits according to a zero code supplementing mode;
and under the condition that the information subframe is subjected to synchronous scrambling processing, RS coding processing and convolutional coding processing in sequence to obtain processed data, the processed data at least forms a complete modulation data frame together with carrier synchronization bits, a guide sequence, a unique code and a frame tail.
6. The satellite communication system of claim 5, wherein the relay station further comprises a filtering module, a second modulation module, and a frequency conversion module, wherein the relay station further processes the signal as follows:
the coded signal is transmitted to a first modulation module at a set code rate, is modulated and then is transmitted to the filtering module at a first carrier frequency;
the filtering module is configured to perform filtering processing on the signal received by the filtering module and transmit the signal to the second modulation module;
the second modulation module transmits the signal received by the second modulation module to the frequency conversion module at a second carrier frequency, wherein the frequency conversion module is configured to convert the signal received by the second modulation module to a set radio frequency output frequency.
7. The satellite communication system of claim 6, wherein the navigation satellite further comprises a demodulation module, wherein the interference identification module is configured to calculate an average power of the signal to determine whether an interference signal exists in the subband, and wherein the demodulation module is configured to demodulate the output signal of the interference cancellation module, wherein:
the frequency of the first complex sinusoid is- Δ f and the frequency of the second complex sinusoid is Δ f.
8. The satellite communication system according to claim 7, wherein the filtering module performs filtering processing on the received signal in a manner that a first filter performs the first filtering processing on the first branch code stream and the second branch code stream, and a second filter performs the second filtering processing on the third modulated signal;
under the condition that the third modulation signal is transmitted to the second modulation module through the filtering module, the second modulation module transmits the signal received by the second modulation module to the frequency conversion module at a second carrier frequency;
the first filter is a raised cosine roll-off filter and the second filter is a band-pass filter; the first-stage modulation processing is quadrature modulation processing, and the second-stage modulation processing is in-phase modulation processing.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109802719A (en) | 2019-05-24 |
| CN109802719B (en) | 2020-07-17 |
| CN111628816A (en) | 2020-09-04 |
| CN111628816B (en) | 2022-02-01 |
| CN111698022A (en) | 2020-09-22 |
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