CN110071752B - Short wave multi-station fusion receiving low fault tolerance rapid combination method - Google Patents
Short wave multi-station fusion receiving low fault tolerance rapid combination method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a low fault tolerance rapid combination method for short wave multi-station fusion receiving, which mainly comprises the following steps: 1) building a short wave communication system; the short wave communication system comprises a front end signal sending module and a short wave multi-site fusion receiving module. 2) And the front-end signal transmitting module transmits the short-wave signal to the short-wave multi-site fusion receiving module. 3) And the short wave multi-site fusion receiving module performs fusion receiving processing on the received k paths of signals so as to restore the short wave signals. Aiming at the fading independence of multiple signal sequences in diversity reception, under the condition that each signal sequence has low error, the thinking of difference bit crossing and majority judgment among the signal sequences is adopted, the low-fault-tolerance rapid combination method for the fusion reception of the short wave multiple stations is established, information retransmission is not needed, and the reliability and the efficiency of short wave communication are improved.
Description
Technical Field
The invention relates to the field of short wave communication, in particular to a low fault tolerance rapid combination method for short wave multi-station fusion receiving.
Background
Due to multipath propagation and time-varying characteristics of an ionosphere short-wave channel, a short-wave receiving signal has a deep fading phenomenon, so that the signal level is reduced by 30-40dB, and the short-wave signal cannot be normally received. People often adopt channel coding such as interleaving, convolutional codes, Turbo codes and the like to detect and correct errors or adopt channel equalization, and can improve the signal receiving effect to a certain extent, but once the channel fading degree tends to be bad, such as high deep fading frequency and long duration, the receiving effect cannot be improved even if the transmitting power is increased, and the traditional point-to-point communication mode is difficult to overcome the influence of the deep fading on the signal quality.
In order to reduce the influence on short-wave communication receiving when a channel is deteriorated, people adopt short-wave diversity receiving to assemble a plurality of independently fading signals, so that multi-channel fusion processing is realized, and the stability and reliability of a short-wave link are effectively improved. Diversity reception can be further divided into two types, namely soft value combination and hard value combination, wherein the hard value combination is based on error check of a baseband sequence after signal demodulation, a correct branch is selected from a plurality of branches to be output, and retransmission is carried out when all signals of the plurality of branches have errors until at least one branch is correct. The hard combination of diversity reception can achieve approximately error-free information communication, and the method is simple to implement, small in modification to the existing equipment and easy to apply.
However, in short-wave communication, in a harsh short-wave channel environment, multi-channel hard combining causes multiple retransmissions of information due to unsatisfactory error check, which affects communication effect, and a retransmission mechanism brings certain system complexity.
Disclosure of Invention
The present invention is directed to solving the problems of the prior art.
The technical scheme adopted for realizing the purpose of the invention is that a low fault tolerance rapid combination method for the fusion receiving of a plurality of short wave stations mainly comprises the following steps:
1) and building a short wave communication system. The short wave communication system comprises a front end signal sending module and a short wave multi-site fusion receiving module.
The short wave multi-site fusion receiving module mainly comprises k receiving/transmitting stations, k short wave modems, an IP link and a fusion processing center.
The receiving/transmitting stations are matched with the short wave modems one by one.
And k receiving/transmitting stations receive the short wave signals transmitted by the front-end signal transmitting module and record the short wave signals as receiving analog signals. The k receiving/transmitting stations transmit the received analog signals to the matched short wave modems.
k short wave modems convert the received analog signals into received digital signals, which are respectively recorded as received digital signal sequence A 1 ，A 2 ，…，A k .1, 2, …, k is a serial number.
The received digital signal matrix a is as follows:
in the formula, a k,n For the nth signal received by the kth transceiver station. A. the r ＝(a r,1 ,a r,2 ,…,a r,n ) And r is 1,2, …, k. And a is r,1 ,a r,2 ,…,a r,n ∈{0,1}。
k short wave modems receive digital signal sequence A through IP link 1 ，A 2 ，…，A k And sending the data packet to the fusion processing center.
2) And the front-end signal transmitting module transmits the short-wave signal to the short-wave multi-site fusion receiving module.
3) And the short wave multi-site fusion receiving module performs fusion receiving processing on the received k paths of signals so as to restore the short wave signals.
The short wave multi-site fusion receiving module performs fusion receiving processing on received multipath signals mainly comprises the following steps:
and 3.1) after the fusion processing center receives the data packets with the same serial number, performing CRC (cyclic redundancy check) on the data packets without the check bits, and checking whether error codes occur or not until the data packets of the k received digital signal sequences are checked. If any data packet of the received digital signal sequence has no error code, the fusion processing center receives and processes the received digital signal sequence without error and ends. If not, the step 2 is carried out.
3.2) distinguishing the value of k. If k is 2, the fusion processing center performs two-branch fusion receiving processing on the 2-path received digital signal sequence. If k is greater than 2, the fusion processing center performs multi-branch fusion receiving processing on the k paths of received digital signal sequences.
a) The main steps for performing the two-branch fusion receiving processing are as follows:
a.1) calculating the sequence number set P of the difference bits, namely:
in the formula, a 1,p For receiving a digital signal sequence A 1 P (a) ofAnd (6) data. a is 2,p For receiving a digital signal sequence A 2 The p-th data of (1).
a.2) based on the sequence number set P of the difference bit, carrying out single-bit crossing and inspection on the difference bit one by one, and the main steps are as follows:
a.2.1) to the received digital signal sequence A 1 ＝(a 1,1 ,…,a 1,q ,…,a 1,n ) And receiving a digital signal sequence A 2 ＝(a 2,1 ,…,a 2,q ,…,a 2,n ) Are cross-interchanged to form two new received digital signal sequences A' 1 ＝(a 1,1 ,a 1,2 ,…,a 2,q ,…,a 1,n-1 ,a 1,n ) And receiving a digital signal sequence A' 2 ＝(a 2,1 ,a 2,2 ,…,az 1,q ,…,a 2,n-1 ,a 2,n )。
Wherein q ∈ P ═ P { [ P ] 1 ,p 2 ,…,p m }，q＝p i The initial value i is 1. m is the total number of difference bits.
a.2.2) to the digital signal sequence A' 1 And receiving a digital signal sequence A' 2 A CRC check is performed.
a.2.3) if A' 1 Or A' 2 And if the check code is consistent with the received check code, selecting one path of signal which is checked to be correct as a final received signal sequence.
If A' 1 And A' 2 If the check code is not consistent with the received check code, making i equal to i +1, and returning to the step a .2.1。
a.2.4) if i ═ m, and A' 1 And A' 2 If the check code is not consistent with the received check code, switching to double-bit crossing and checking.
a.3) based on the sequence number set P of the difference bit, performing double-bit crossing and inspection on the difference bit one by one, and the main steps are as follows:
a.3.1) to the received digital signal sequence A 1 ＝(a 1,1 ,…,a 1,q1 ,…,a 1,q2 ,…,a 1,n ) And receiving a digital signal sequence A 2 ＝(a 2,1 ,…,a 2,q1 ,…,a 2,q2 ,…,a 2,n ) Are interleaved to form two new received digital signal sequences
And receiving a sequence of digital signals
Wherein q is 1 ∈P＝{p 1 ,p 2 ,…,p m }，q 2 ∈P＝{p 1 ,p 2 ,…,p m }。q 1 ＝p i ,q 2 ＝p j ,. I is more than or equal to 1 and less than or equal to m, and j is more than or equal to i +1 and less than or equal to m. The initial value i is 1 and j is 2.
a.3.2) pairs of received digital signal sequences A' 1 And receiving a digital signal sequence A' 2 A CRC check is performed.
a.3.3) if receiving the digital signal sequence A' 1 Or receive a digital signal sequence A' 2 And if the check code is consistent with the received check code, selecting one path of signal with correct check as an output signal sequence of the fusion processing.
If a digital signal sequence A 'is received' 1 And receiving a digital signal sequence A' 2 The check code is inconsistent with the received check code, and if the digital signal sequence A 'is received' 1 And receiving a digital signal sequence A' 2 If the check code is not consistent with the received check code, j is equal to j +1, and the step 3.1 is returned.
a.3.4) when j is m, let i be i +1 and return to step 3.1.
a.3.5) if i ═ m-1, j ═ m, and receive the digital signal sequence a' 1 And receiving a digital signal sequence A' 2 And if the check code is not consistent with the received check code, randomly selecting one path from the two paths of signals as an output signal for fusion processing.
b) The main steps of the fusion processing center for carrying out multi-branch fusion receiving processing on the k-path receiving digital signal sequence are as follows:
b.1) combining the k-path received digital signal sequences into
Group receives a sequence of digital signals.
b.2) carrying out two-branch fusion receiving processing on a group of receiving digital signal sequences.
And carrying out bit crossing and checking on each combination according to the method, stopping if a correct checking signal sequence appears, and taking the correct checking signal sequence as an output signal of fusion processing.
b.3) after all received digital signal sequences are selected, if the single bit crossing and the inspection and the double bit crossing and the inspection can not obtain correct signal sequences, judging the differential bit according to a majority principle, reconstructing a new digital signal sequence from the multipath signals as an output signal of fusion processing, and the main steps are as follows:
b.3.1) judging the e-th data of the k-path received digital signal sequence, and if the bit value is 1, writing the data into the set
If the bit value is 0, then write the set
Wherein e is more than or equal to 1 and less than or equal to n.
b.3.2) notation set N e The number of the middle elements is L (N) e ) Set M of e The number of the middle element is L (M) e ) Set N is paired based on majority rule e And set M e And (6) making a decision.
If L (N) e )≥L(M e ) The e-th bit value b e ＝1。
If L (N) e )<L(M e ) Then e bit value b e ＝0。
b.3.3) forming a k-branch decision signal sequence B ═ B 1 ,b 2 ,b 3 ,…,b n And taking the signal sequence B as the output of the fusion processing.
The technical effect of the present invention is undoubted. Aiming at the fading independence of multiple signal sequences in diversity reception, under the condition that each signal sequence has low error, the thinking of difference bit crossing and majority judgment among the signal sequences is adopted, the low-fault-tolerance rapid combination method for the fusion reception of the short wave multiple stations is established, information retransmission is not needed, and the reliability and the efficiency of short wave communication are improved.
Drawings
FIG. 1 is a short-wave multi-channel convergence receiving architecture;
FIG. 2 is a diagram illustrating the convergence of multiple baseband signals;
FIG. 3 is a flow chart of a fusion process;
FIG. 4 is a schematic diagram of a two branch signal single bit cross-over interchange;
FIG. 5 is a schematic diagram of a two-bit cross-exchange of two branch signals;
FIG. 6 is a flow chart of a two branch fusion receive algorithm;
FIG. 7 is a schematic view of a two branch receiving combination mode;
fig. 8 is a flow chart of the multi-branch fusion receiving algorithm.
Detailed Description
The present invention will be further described with reference to the following examples, but it should be understood that the scope of the subject matter described above is not limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
a low fault tolerance rapid combination method for short wave multi-station fusion receiving mainly comprises the following steps:
1) as shown in fig. 1, a short wave communication system is constructed. The short wave communication system comprises a front end signal sending module and a short wave multi-site fusion receiving module.
In an emergency, the information transmitted by the head-end station is received by a plurality of stations. When the fading characteristics of different stations for receiving the same information are irrelevant, the information received by each station is converged to an information receiving center through a ground transmission network, and a stable and reliable receiving effect can be obtained after fusion processing is carried out, so that the unstable and unreliable receiving effect of a single short-wave station is eliminated, and the emergency uploading information is ensured to be timely and accessible.
The short wave multi-site fusion receiving module mainly comprises k receiving/transmitting stations, k short wave modems, an IP link and a fusion processing center.
The receiving/transmitting stations are matched with the short wave modems one by one.
And k receiving/transmitting stations receive the short wave signals transmitted by the front-end signal transmitting module and record the short wave signals as receiving analog signals. The k receiving/transmitting stations transmit the received analog signals to the matched short wave modems.
k short wave modems convert the received analog signals into received digital signals, which are respectively recorded as received digital signal sequence A 1 ，A 2 ，…，A k .1, 2, …, k is a serial number.
The received digital signal matrix a is as follows:
in the formula, a k,n For the nth signal received by the kth transceiver station. A. the r ＝(a r,1 ,a r,2 ,…,a r,n ) And r is 1,2, …, k. And a is r,1 ,a r,2 ,…,a r,n E {0,1 }. The elements in the received digital signal matrix a represent the signals received by the receiving/transmitting station. A. the r Representing the sequence of signals received by the kth receiving/transmitting station.
k short wave modems receive digital signal sequence A through IP link 1 ，A 2 ，…，A k And sending the data packet to the fusion processing center. The signals of the multiple receiving branches are frequency-converted, demodulated by a baseband and decoded by a channel, and then form a digital signal sequence consisting of 0 and 1, and are converged to a fusion processing center for processing, as shown in fig. 2.
2) And the front-end signal transmitting module transmits the short-wave signal to the short-wave multi-site fusion receiving module.
3) As shown in fig. 3, the short-wave multi-station convergence receiving module performs convergence receiving processing on the received k-channel signals, so as to restore the short-wave signals.
The short wave multi-site fusion receiving module performs fusion receiving processing on received multipath signals mainly comprises the following steps:
and 3.1) after the fusion processing center receives the data packets with the same serial number, performing CRC (cyclic redundancy check) on the data packets without the check bits, and checking whether error codes occur or not until the data packets of the k received digital signal sequences are checked. If any data packet of the received digital signal sequence has no error code, the fusion processing center receives and processes the received digital signal sequence without error and ends. If not, the step 2 is carried out.
3.2) distinguishing the value of k. If k is 2, the fusion processing center performs two-branch fusion receiving processing on the 2-path received digital signal sequence. If k is greater than 2, the fusion processing center performs multi-branch fusion receiving processing on the k-path received digital signal sequence.
a) The main steps for performing the two-branch fusion receiving processing are as follows:
a.1) calculating the sequence number set P of the difference bits, namely:
in the formula, a 1,p For receiving a digital signal sequence A 1 The p-th data of (1). a is 2,p For receiving a digital signal sequence A 2 The p-th data of (1).
a And 2) as shown in fig. 6, based on the sequence number set P of the differential bits, performing single-bit interleaving and checking on the differential bits one by one, and the main steps are as follows:
a.2.1) sequence A of received digital signals as shown in FIG. 4 1 ＝(a 1,1 ,…,a 1,q ,…,a 1,n ) And receiving a digital signal sequence A 2 ＝(a 2,1 ,…,a 2,q ,…,a 2,n ) Are cross-interchanged to form two new received digital signal sequences A' 1 ＝(a 1,1 ,a 1,2 ,…,a 2,q ,…,a 1,n-1 ,a 1,n ) And receiving a digital signal sequence A' 2 ＝(a 2,1 ,a 2,2 ,…,a 1,q ,…,a 2,n-1 ,a 2,n )。
Wherein q ∈ P ═ P { [ P ] 1 ,p 2 ,…,p m }，q＝p i The initial value i is 1.
a.2.2) to the digital signal sequence A' 1 And receiving a digital signal sequence A' 2 A CRC check is performed.
a.2.3) if A' 1 Or A' 2 And if the check code is consistent with the received check code, selecting one path of signal which is checked to be correct as a final received signal sequence.
If A' 1 And A' 2 And if the check code is not consistent with the received check code, making i equal to i +1, and returning to the step a.2.1.
a.2.4) if i ═ m, and A' 1 And A' 2 If the check code is not consistent with the received check code, switching to double-bit crossing and checking.
a.3) based on the sequence number set P of the difference bit, performing double-bit crossing and inspection on the difference bit one by one, and the main steps are as follows:
a.3.1) sequence A of received digital signals as shown in FIG. 5 1 ＝(a 1,1 ,…,a 1,q1 ,…,a 1,q2 ,…,a 1,n ) And receiving a digital signal sequence A 2 ＝(a 2 ,1,…,a 2,q1 ,…,a 2,q2 ,…,a 2,n ) Are interleaved to form two new received digital signal sequences
And receiving a sequence of digital signals
Wherein q is 1 ∈P＝{p 1 ,p 2 ,…,p m }，q 2 ∈P＝{p 1 ,p 2 ,…,p m }。q 1 ＝p i ,q 2 ＝p j ,. I is more than or equal to 1 and less than or equal to m, and j is more than or equal to i +1 and less than or equal to m. The initial value i is 1 and j is 2.
Double bit cross exchange (q) 1 ,q 2 ) A share of
And (4) combination.
a.3.2) pairs of received digital signal sequences A' 1 And receiving a digital signal sequence A' 2 A CRC check is performed.
a.3.3) if receiving the digital signal sequence A' 1 Or receive a digital signal sequence A' 2 And if the check code is consistent with the received check code, selecting one path of signal with correct check as an output signal sequence of the fusion processing.
If a digital signal sequence A 'is received' 1 And receiving a digital signal sequence A' 2 The check code is inconsistent with the received check code, and if the digital signal sequence A 'is received' 1 And receiving a digital signal sequence A' 2 If the check code is inconsistent with the received check code and the digital signal sequence A 'is received' 1 And receiving a digital signal sequence A' 2 If the check code is not consistent with the received check code, j is made j +1, and the procedure returns to step 3.1.
a.3.4) when j is m, let i +1 and return to step 3.1.
a.3.5) if i ═ m-1, j ═ m, and receive the digital signal sequence a' 1 And receiving a digital signal sequence A' 2 And if the check code is not consistent with the received check code, randomly selecting one path from the two paths of signals as an output signal for fusion processing.
The loop code is as follows:
b) as shown in fig. 8, the multi-branch fusion receiving processing performed by the fusion processing center on the k-path received digital signal sequence mainly includes the following steps:
b.1) receiving the k-path received digital signal sequence as shown in FIG. 7In combination of
Group receives a sequence of digital signals. One line in the figure represents a 2-branch receive combining.
b.2) carrying out two-branch fusion receiving processing on a group of receiving digital signal sequences.
And carrying out bit crossing and checking on each combination according to the method, stopping if a correct checking signal sequence appears, and taking the signal sequence checked correctly as an output signal of fusion processing.
b.3) after all received digital signal sequences are selected, if the single bit crossing and the inspection and the double bit crossing and the inspection can not obtain correct signal sequences, judging the differential bit according to a majority principle, reconstructing a new digital signal sequence from the multipath signals as an output signal of fusion processing, and the main steps are as follows:
b.3.1) judging the e-th data of the k-path received digital signal sequence, and if the bit value is 1, writing the data into the set
If the bit value is 0, then write the set
Wherein e is more than or equal to 1 and less than or equal to n.
b.3.2) set N e The number of the medium element is L (N) e ) Set M of e The number of the middle element is L (M) e ) Set N is paired based on majority rule e And set M e And (6) making a decision.
If L (N) e )≥L(M e ) The e-th bit value b e ＝1。
If L (N) e )<L(M e ) The e-th bit value b e ＝0。
b.3.3) forming a k-branch decision signal sequence B ═ B 1 ,b 2 ,b 3 ,…,b n And taking the signal sequence B as the output of the fusion processing.
For example, when k is 3, the digital signal sequence a is received 1 ＝[1，1，1，0，0，1，0,1]Receiving a digital signal sequence A 2 ＝[1，1，1，1，1，0，0,1]Receiving a digital signal sequence A 3 ＝[1，0，1，1，1，1，0,1]Then the 1 st element corresponds to the set N e ＝[1,1,1]Set M of e Is empty.
Set N corresponding to 2 nd element e ＝[1,1]Set M of e ＝[0]。
Set N corresponding to the 3 rd element e ＝[1,1,1]Set M of e Is empty.
Set N corresponding to the 4 th element e ＝[1,1]Set M of e ＝[0]。
Set N corresponding to 5 th element e ＝[1,1]Set M of e ＝[0]。
Set N corresponding to the 6 th element e ＝[1,1]Set M e ＝[0]。
Set N corresponding to 7 th element e Is empty, set M e Is ═ 0, 0]。
Set N corresponding to 8 th element e ＝[1,1,1]Set M of e Is empty.
Therefore, B ═ 1,1,1,1,0, 1.
Claims (2)
1. A low fault tolerance fast merging method for short wave multi-station fusion receiving is characterized by comprising the following steps:
1) building a short wave communication system; the short wave communication system comprises a front end signal sending module and a short wave multi-site fusion receiving module;
the short wave multi-site fusion receiving module comprises k receiving/transmitting stations, k short wave modems, an IP link and a fusion processing center;
the receiving/transmitting stations are matched with the short wave modems one by one;
k receiving/transmitting stations receive the short wave signals transmitted by the front end signal transmitting module and record the short wave signals as receiving analog signals; k receiving/transmitting stations transmit the receiving analog signals to the matched short wave modem;
k short wave modems convert the received analog signals into received digital signals, which are respectively recorded as received digital signal sequence A 1 ，A 2 ，...，A k (ii) a 1, 2, k is a serial number;
the received digital signal matrix a is as follows:
In the formula, a k，n An nth signal received for a kth receiving/transmitting station; a. the r ＝(a r，1 ，a r，2 ，...，a r，n ) R 1, 2.., k; and a is r，1 ，a r，2 ，...，a r，n ∈{0，1}；
k short wave modems receive digital signal sequence A through IP link 1 ，A 2 ，...，A k Sending the data packet to a fusion processing center;
2) the front-end signal sending module sends short-wave signals to the short-wave multi-site fusion receiving module;
3) the short wave multi-site fusion receiving module performs fusion receiving processing on the received k paths of signals so as to restore short wave signals;
the multi-branch fusion receiving processing of the k-branch received digital signal sequence by the fusion processing center comprises the following steps:
3.1) combining the k-path received digital signal sequences into
Group receiving digital signal sequence; k is more than 2:
3.2) carrying out two-branch fusion receiving processing on a group of receiving digital signal sequences;
the steps for carrying out the two branch fusion receiving processing are as follows:
3.2.1) compute the sequence number set P of the difference bits, i.e.:
in the formula, a 1，p For receiving a digital signal sequence A 1 The p-th data of (1); a is 2，p For receiving a digital signal sequence A 2 The p-th data of (1);
3.2.2) based on the sequence number set P of the difference bit, the difference bit is crossed and checked one by the single bit, the steps are:
3.2.2.1) to receive the digital signal sequence A 1 ＝(a 1，1 ，...，a 1，q ，...，a 1，n ) And receiving a digital signal sequence A 2 ＝(a 2，1 ，...，a 2，q ，...，a 2，n ) Are cross-interchanged to form two new received digital signal sequences A' 1 ＝(a 1，1 ，a 1，2 ，...，a 2，q ，...，a 1，n-1 ，a 1，n ) And receiving a digital signal sequence A' 2 ＝(a 2，1 ，a 2，2 ，...，a 1，q ，...，a 2，n-1 ，a 2，n )；
Wherein q ∈ P ═ P { [ P ] 1 ，p 2 ，...，P m Q is pi, and an initial value i is 1; m is the total number of the difference bits;
3.2.2.2) to digital Signal sequence A' 1 And receiving a digital signal sequence A' 2 Performing CRC;
3.2.2.3) if A' 1 Or A' 2 If the check code is consistent with the received check code, selecting one path of signal which is checked correctly as a final received signal sequence;
if A' 1 And A' 2 If the check code is not consistent with the received check code, making i equal to i +1, and returning to step 3.2.2.1;
3.2.2.4) if i ═ m, and A' 1 And A' 2 If the check code is not consistent with the received check code, switching to double-bit crossing and checking;
3.2.3) based on the sequence number set P of the difference bit, performing double-bit crossing and inspection on the difference bit one by one, comprising the following steps:
3.2.3.1) receiving the digital signal sequence A 1 ＝(a 1，1 ，...，a 1，q1 ，...，a 1，q2 ，...，a 1，n ) And receiving a digital signal sequence A 2 ＝(a 2，1 ，...，a 2，q1 ，...，a 2，q2 ，...，a 2，n ) Are interleaved to form two new received digital signal sequences
And receiving a sequence of digital signals
Wherein q is 1 ∈P＝{p 1 ，p 2 ，...，p m }，q 2 ∈P＝{p 1 ，p 2 ，...，P m }；q 1 ＝p i ，q 2 ＝p j B, carrying out the following steps of; i is more than or equal to 1 and less than or equal to m, and j is more than or equal to i +1 and less than or equal to m; initial values i-1, j-2;
3.2.3.2) pairs of received digital signal sequences A' 1 And receiving a digital signal sequence A' 2 Performing CRC;
3.2.3.3) if receiving the digital signal sequence A' 1 Or receive a digital signal sequence A' 2 If the check code is consistent with the received check code, selecting one path of signal with correct check as an output signal sequence of fusion processing;
if a digital signal sequence A 'is received' 1 And receiving a digital signal sequence A' 2 If the check code is not consistent with the received check code, making j equal to j +1, and returning to step 3.2.3.1;
3.2.3.4) when j is m, let i be i +1 and return to step 3.2.3.1;
3.2.3.5) if i-m-1, j-m, and receiving the digital signal sequence a' 1 And receiving a digital signal sequence A' 2 If the check code is not consistent with the received check code, one path of the two paths of signals is randomly selected as an output signal of the fusion processing;
bit crossing and checking are carried out on each combination according to the method, if a correct check signal sequence appears, the combination can be stopped, and the signal sequence which is checked correctly is used as an output signal of fusion processing;
3.3) after all received digital signal sequences are selected, if the single-bit crossing and the check and the double-bit crossing and the check can not obtain correct signal sequences, judging the differential bit according to a majority principle, reconstructing a new digital signal sequence from the multi-path signals as an output signal of fusion processing, and the steps are as follows:
3.3.1) judging the e-th data of the k-path received digital signal sequence, and if the bit value is 1, writing the data into the set
If the bit value is 0, then write the set
Wherein e is more than or equal to 1 and less than or equal to n;
3.3.2) set N e The number of the middle elements is L (N) e ) Set M of e The number of the middle element is L (M) e ) Set N is paired based on majority rule e And set M e Judging;
if L (N) e )≥L(M e ) If yes, the e-th bit value be is 1;
if L (N) e )＜L(M e ) If yes, the e-th bit value be is 0;
3.3.3) form a k-branch decision signal sequence B ═ B 1 ，b 2 ，b 3 ，...，b n And taking the signal sequence B as the output of the fusion processing.
2. The method according to claim 1, wherein the short wave multi-station convergence receiving module performs convergence receiving processing on the received multipath signals by the following steps:
1) after receiving the data packets with the same serial number, the fusion processing center carries out CRC (cyclic redundancy check) on the data packets without the check bits, checks whether error codes occur or not until the data packets of the k received digital signal sequences are checked; if any data packet of the received digital signal sequence has no error code, the fusion processing center receives and processes the received digital signal sequence without error and finishes; if not, turning to the step 2;
2) Judging the value of k; if k is 2, the fusion processing center performs two-branch fusion receiving processing on the 2-path received digital signal sequence; if k is larger than 2, the fusion processing center carries out multi-branch fusion receiving processing on the k paths of received digital signal sequences.
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