CN103501218A - Resource reuse-based multi-carrier adaptive demodulation method - Google Patents
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Abstract
The invention discloses a resource reuse-based multi-carrier adaptive demodulation method. The method mainly comprises the following steps: inputting a plurality of paths of serial data to cache; caching each carrier intermediate variable; capturing a header; performing bit timing deviation estimation; interpolating a trigonometric function; performing coordinate transformation; inputting amplitude and phase data to cache; caching each carrier intermediate variable; performing initial frequency deviation and phase deviation estimation; performing RM decoding and carrier tracking algorithm processing. According to the method, universal design for adaptive demodulation on a variable-rate and multiple-modulation-mode burst multi-carrier signal is realized. The problem of serious rain fade during multi-carrier wireless transmission of a satellite at the Ku/Ka frequency band, the problem of different data transmission requirements for various types of communication terminals and the problem of requirements of multi-carrier anti-interference communication of a communication satellite system are solved.
Description
Technical field
The present invention relates to a kind of multicarrier adaptive demodulation method based on resource multiplex.
Background technology
Satellite communication has the characteristics such as the region of covering is wide, communication distance is far away, message capacity is large, transmission quality is good, and oneself becomes a kind of important means of communication of communication.Because the satellite communication business is increasingly busy, message capacity increases sharply, and causes radio spectrum very crowded, in order to solve the problem of frequency spectrum resource anxiety, and the high band development more than satellite communication reaches towards the Ka that bright prospects are arranged (20/30GHz).In conjunction with the diversified requirement of communication type, make satellite communication system have following problem to need to solve in the application of Ka and above frequency range: 1) the serious rain of satellite when the Ku/Ka frequency range is carried out the multi-carrier-wave wireless transmission problem that declines; 2) how communication satellite system meets the different transfer of data needs of problems of polymorphic type communication terminal; 3) how communication satellite system meets the needs of problems of multicarrier antijam communication.And the basis that solves everything is the efficient multicarrier adaptive demodulation ability of satellite.
The multicarrier adaptive demodulation had both required each road carrier wave can the independence self-adapting demodulation, required again each carrier wave can resource multiplex, and the consumption of resource can not be more much larger than single carrier, and therefore, the quality of multicarrier adaptive demodulation performance directly affects the overall performance of system.
Existing multicarrier demodulating algorithm is all relatively single.For example document 1 " research of multicarrier burst global solution conditioning technology " (Li Hui, Xian Electronics Science and Technology University's master thesis, 2011) has provided the All Digital Receiving Technologies of multicarrier burst, comprises bit synchronization and carrier synchronization; Document 2 " Multi-Carrier Multi-Rate Modem for Universal FDMA/TDMA system " (Fumihiro Yamashita, 24th AIAA international Communications Satellite Systems Conference, 2006-5316) provided the design of the QPSK multicarrier burst demodulation device based on resource multiplex.In document 1, the multicarrier burst algorithm that it provides is to realize separately, does not provide concrete multiplex mode; In document 2, the multicarrier burst demodulation algorithm provided only can be applicable to QPSK, and demodulation modes is single.
Summary of the invention
The technical problem that the present invention solves is: overcome the deficiencies in the prior art, a kind of multicarrier adaptive demodulation method based on resource multiplex is provided, with very little resource consumption, has solved the spaceborne problem of implementation of satellite when the Ku/Ka frequency range is carried out the multicarrier adaptive communications.
Technical scheme of the present invention is: a kind of multicarrier adaptive demodulation method based on resource multiplex, and step is as follows:
1) real part and the imaginary part of the input of the multi-path serial after digital demultiplexing data are buffered in RAM1, often deposit data in, the address Addr_in of input data adds 1, and writes successively in FIFO1 by each carrier wave initial parameter; Described initial parameter comprises input data address Addr_best, the number Part_num of IOB, the numbering Channel_index of each carrier wave, the 128 bit sequence Demola that catch sign of flag, are correlated with for the same top guide that start processing;
2) read the carrier parameter of the 1st road carrier wave from FIFO1, the value of judgement Flag, if the value of Flag is not 1, show successfully not catch, and enters step 3); If the value of Flag is 1, mean successfully to catch, enter step 5);
3) take Addr_best as initial address, A is the carrier wave number, reading out data from RAM1, carry out hard decision after doing calculus of differences, deposit the hard decision result in Demola, the same top guide is done relevant, if Addr_in deducts Addr_best and is less than 2 times of carrier wave number A, Flag is set to the initial address that 1, Addr_best is set to the list entries while successfully catching, and enters step 4); If Addr_in deducts Addr_best and is more than or equal to 2 times of carrier wave number A, deposit parameter now in FIFO1, jump to step 2) continue to read next road carrier parameter;
4) be greater than M if Addr_in deducts Addr_best, enter step 5); If Addr_in deducts Addr_best and is less than or equal to M, deposit carrier parameter now in FIFO1, jump to step 2) continue to read next road carrier parameter; Described
wherein N is the output symbol number after the trigonometric function interpolation;
5) take Addr_best as initial address, A is interval, reads 4N sampled point from RAM1, obtains the bit timing deviate;
6) take Addr_best-1 as initial address, A is interval, read 4N sampled point from RAM1, the bit timing deviate obtained according to step 5), after 4N sampled point done to the trigonometric function interpolation, export N symbol, carrier parameter that simultaneously will be now deposits in FIFO1, jumps to step 2) continue to read next road carrier parameter;
7) real part and the imaginary data of N symbol exporting in step 6) are converted to amplitude and phase data;
8) amplitude and the phase data that in step 7), obtain are deposited in RAM2 by carrier number, the n road often deposits data in, n=1, and 2,3...A ，Gai road input data address Addr_in_mid_n adds 1, and the initial parameter on Jiang Ge road, writes successively in FIFO2; Described initial parameter comprises input data address Addr_track, the number Part_num of IOB, the initial frequency deviation Fre_move estimated, the initial skew Phase_offset estimated, the coded modulation type Rm_reg that carrier index Channel_index, carrier wave frame head index signal initial_flag (Channel_index), carrier wave input data address Addr_in_mid_n, initial frequency deviation and skew are estimated marking signal Flag_est, started processing;
9) read first via carrier parameter, the value of judgement Flag_est, if the value of Flag_est is not 1, enter step 10); If the value of Flag_est is 1, enter step 13);
10) value of judgement initial_flag (Channel_index), if the value of initial_flag (Channel_index) is 1, enter step 11), if the value of initial_flag (Channel_index) is not 1, current carrier parameter is deposited in FIFO, jump to step 9) and continue to read next road carrier parameter;
11) take the synthetic address Addr_Channel of carrier index Channel_index and input data address Addr_track is initial address, read 128 amplitudes and phase data from RAM2, and carry out initial frequency deviation and skew and estimate, the initial frequency deviation Fre_move that obtains estimating and skew Phase_offset;
12) take Addr_Channel reads amplitude and the phase data of 64 coded modulation pattern-words from RAM2 as initial address, according to the Fre_move received from step 11) and Phase_offset to the processing of rectifying a deviation of the amplitude of 64 coded modulation pattern-words reading and phase data, then the data after correction are carried out to hard decision, data after hard decision are done to RM decoding computing, obtain coded modulation type RM_reg, and Flag_est is set to 1, enter step 13);
13) be greater than N if Addr_in_mid_n deducts Addr_track, enter step 14), if Addr_in_mid_n deducts Addr_track, be less than or equal to N, current carrier parameter is deposited in FIFO2, jump to step 9) and continue to read next road carrier parameter;
14) take amplitude and the phase data of Addr_Channel as initial address reading information data from RAM2, according to the value of the Fre_move obtained in step 11) and Phase_offset, amplitude and the phase data of the input data that read are rectified a deviation, and according to the difference of RM_reg, data after selecting different carrier track algorithms to correction are carried out the carrier track processing and are a processing unit piecemeal output by 128 data, and current carrier parameter is deposited in FIFO2, jump to step 9) and continue to read next road carrier parameter, until complete the processing to A road carrier wave.
The present invention compared with prior art has following advantage:
(1) the present invention has good performance on multicarrier burst adaptive demodulation, and under the impact of frequency deviation, skew, bit timing deviation and white noise, demodulation losses is less than 0.5dB.
(2) resource multiplex rate of the present invention is high, uses the Virtex4-55 chip, only with 14% resource consumption rate, completes that the multicarrier self adaptation is caught and bit synchronization function, 13% resource consumption rate complete multicarrier adaptive carrier synchronizing function, is a bit larger tham the single carrier module.
(3) the present invention has realized the burst multi-carrier signal of variable Rate (2～7Mbps), Multiple modulation mode (QPSK, 8PSK and 16APSK) is carried out to adaptive demodulation.Rate-compatible, can adapt to Different Modulations.
The accompanying drawing explanation
The multicarrier adaptive demodulation method block diagram that Fig. 1 is resource multiplex;
Fig. 2 is the signal transmission frame structure;
Fig. 3 is the RAM storage map.
Embodiment
8 carrier waves of below take are example, by reference to the accompanying drawings the present invention are described further.
As shown in Figure 1,8 carrier multiplexings are to realize that by FIFO the ，Ge road intermediate parameters that it is important deposits in FIFO, pending to which, continue to process reading on the basis of parameter.It is respectively that Addr_best(starts the input data address of processing that FIFO1 Zhong Ge road needs the parameter of buffer memory), the number of Part_num(IOB), the numbering of each carrier wave of Channel_index(, scope 0～7), the sign that whether Flag(successfully catches, ' 1 ' represents successfully catches), the Burst_type(outburst type, ' 0 ' representative data burst, ' 1 ' representative range finding burst), 128 bit sequences that Demola(is relevant for the same top guide), described front top guide is catching and synchronizing sequence in Fig. 2.
The overall process process is as follows:
1) read a road carrier parameter from FIFO1, the value of judgement Flag, if the value of Flag is not 1, show successfully not catch, and enters step 2); If the value of Flag is 1, mean successfully to catch, enter step 4);
2) take Addr_best as initial address, 8 is the carrier wave number, reading out data from RAM1, carry out hard decision after doing calculus of differences, deposit the hard decision result in Demola, the same top guide is done relevant, if Addr_in deducts Addr_best and is less than 16, Flag is set to the initial address that 1, Addr_best is set to the list entries while successfully catching, and enters step 3); If Addr_in deducts Addr_best and is more than or equal to 16, deposit parameter now in FIFO1, jump to step 1) and continue to read next road carrier parameter;
3) if deducting Addr_best, Addr_in is greater than 512
enter step 4), if Addr_in deducts Addr_best, be less than or equal to 512, deposit carrier parameter now in FIFO1, jump to step 2) continue to read next road carrier parameter;
4) take Addr_best as initial address, 8 is interval, reads 512 sampled points from RAM1, estimates bit timing deviation (seeing patent " a kind of MAPSK adaptive de adjusting system ");
5) take Addr_best-1 as initial address, 8 is interval, read 512 sampled points from RAM, the bit timing deviate obtained according to step 4), 512 sampled points are done to trigonometric function interpolation (seeing patent " a kind of MAPSK adaptive de adjusting system ") piecemeal output, every 128 symbol datas, along with feeding back to, the outburst type of each carrier wave catches and the bit synchronization processing section, the output symbol piece number of each road carrier wave has just been determined (data burst: ceil (16352/N)=128, range finding burst: ceil (4256/N)=34), the Ruo Benlu carrier wave is that data burst and Part_num<128Huo Zhe road carrier wave are range finding burst and Part_num<34), export 128 symbols, after output, Part_num is set to Part_num+1, Addr_best is set to Addr_best+512, Burst_type is set to the Burst_type that feeds back Zhe road carrier wave, all the other are constant, the parameter of Jiang Zhe road carrier wave deposits in FIFO1, reading the parameter of next road carrier wave is processed again, the Ruo Benlu carrier wave is data burst and Part_num=128, illustrates that this is last piece of this carrier data burst frame, exports M1 symbol (M1=16352-N* (Part_num-1)=96), and after output, Addr_best is set to Addr_best+M1 '
channel_index is constant, and all the other parameters that entirely are set to 0 ，Jiang Zhe road carrier wave deposit in FIFO1, then the parameter that reads next road carrier wave is processed, the Ruo Benlu carrier wave is range finding burst and Part_num=34, illustrates that this is last piece of this carrier wave range finding burst frame, exports M2 symbol (M2=4256-N* (Part_num-1)=32), and after output, Addr_best is set to Addr_best+M2 '
channel_index is constant, and all the other parameters that entirely are set to 0 ，Jiang Zhe road carrier wave deposit in FIFO1,, jump to the parameter that step (1) reads next road carrier wave,
6) real part and the imaginary data piece of 128 symbols exporting in step 5) are converted to amplitude and phase data;
7) amplitude and the phase data that in step 6), obtain are deposited in RAM2 by carrier number, the n road often deposits data in, n=1, and 2,3...8 ，Gai road input data address Addr_in_mid_n adds 1, and the initial parameter on Jiang Ge road, writes successively in FIFO2; Described initial parameter comprises input data address Addr_track, the number Part_num of IOB, the initial frequency deviation Fre_move estimated, the initial skew Phase_offset estimated, the coded modulation type Rm_reg that carrier index Channel_index, carrier wave frame head index signal initial_flag (Channel_index), carrier wave input data address Addr_in_mid_n, initial frequency deviation and skew are estimated marking signal Flag_est, started processing;
8) read a road carrier parameter, the value of judgement Flag_est, if the value of Flag_est is not 1, enter step (9); If the value of Flag_est is 1, enter step (12);
9) value of judgement initial_flag (n), n is for reading Zhe road carrier number Channel_index, if the value of initial_flag (n) is 1, illustrate that this road carrier wave has had data to deposit RAM2 in, enter step (10), if the value of initial_flag (n) is not 1, current carrier parameter is deposited in to (Channel_index Wei Zhe road carrier number in FIFO2, all the other are all 0), and read next road carrier parameter, return to step (8);
10) take the synthetic address Addr_Channel of carrier index Channel_index and input data address Addr_track is initial address, read 128 amplitudes and phase data from RAM2, front top guide (catching and synchronizing sequence in Fig. 3) is done to initial frequency deviation and skew estimation (seeing patent " a kind of MAPSK adaptive de adjusting system "), the initial frequency deviation that obtains estimating (Fre_move) and skew (Phase_offset);
11) take the synthetic address Addr_Channel of carrier index Channel_index and input data address Addr_track is initial address, read from RAM2 and read 64 amplitudes and phase data (the coded modulation pattern-word of Fig. 2), use from 10) the initial frequency deviation that receives and skew to the processing of rectifying a deviation of these data, then the data after correction are carried out to hard decision, afterwards the data after hard decision are done to RM decoding computing, obtain coded modulation type RM_reg, and Flag_est is set to 1, enter step 12);
12) if deducting Addr_track, Addr_in_mid_n is greater than the symbol data number of 128(128 for one of output), enter step 13), if Addr_in_mid_n deducts Addr_track and is less than or equal to 128, current carrier parameter is deposited in FIFO2, jump to step 8) and continue to read next road carrier parameter;
13) read amplitude and the phase data of input data from RAM2, with 10) in the Fre_move and the Phase_offset value that obtain these data are rectified a deviation, and according to the difference of RM_reg, data after selecting different carrier track algorithm (seeing patent " a kind of MAPSK adaptive de adjusting system ") to correction are carried out the carrier track processing and are 1 processing unit piecemeal output by 128 data, along with the outburst type of this road carrier wave feeds back to the carrier track module, the data block number of this road carrier wave output has just been determined (data burst: ceil (16352/N)=128, range finding burst: ceil (4256/N)=34).The Ruo Benlu carrier wave is that data burst and Part_num<128Huo Zhe road carrier wave are range finding burst and Part_num<34), export 128 amplitudes, phase data, after output, Part_num is set to Part_num+1, Addr_track is set to Addr_track+128, and Burst_type is set to the Burst_type that feeds back Zhe road carrier wave, and all the other are constant, the parameter of Jiang Zhe road carrier wave deposits in FIFO2, then the parameter that reads next road carrier wave is processed; The Ruo Benlu carrier wave is data burst and Part_num=128, illustrate that this is last piece of this carrier data burst frame, export M1 amplitude, phase data (M1=96), after output, Addr_track is set to Addr_track+96, and Channel_index is constant, and all the other are set to 0 entirely, the parameter of Jiang Zhe road carrier wave deposits in FIFO2, then the parameter that reads next road carrier wave is processed; The Ruo Benlu carrier wave is range finding burst and Part_num=34, illustrates that this is last piece of this carrier wave range finding burst frame, exports M2 amplitude, phase data (M2=4256-N
*(Part_num-1)=32),, after output, Addr_track is set to Addr_track+32, Channel_index is constant, and all the other are set to 0 entirely, and current carrier parameter is deposited in FIFO2, read the parameter of next carrier wave, jump to step (8) and continue to process.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
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| CN114039623A (en) * | 2021-10-22 | 2022-02-11 | 中国电子科技集团公司第五十四研究所 | Low-carrier-to-noise-ratio short burst spread spectrum signal tracking method |
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| CN101355546A (en) * | 2008-09-19 | 2009-01-28 | 北京交通大学 | ICI self-cancellation method for OFDM system based on adaptive modulation |
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| CN1191050A (en) * | 1995-07-12 | 1998-08-19 | 汤姆森消费电子有限公司 | Apparatus for demodulating and decoding video signals |
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| CN114039623A (en) * | 2021-10-22 | 2022-02-11 | 中国电子科技集团公司第五十四研究所 | Low-carrier-to-noise-ratio short burst spread spectrum signal tracking method |
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