CN110048809B - Dynamic transmission method for error-free fusion receiving of short wave multi-station - Google Patents
Dynamic transmission method for error-free fusion receiving of short wave multi-station Download PDFInfo
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- CN110048809B CN110048809B CN201910173493.1A CN201910173493A CN110048809B CN 110048809 B CN110048809 B CN 110048809B CN 201910173493 A CN201910173493 A CN 201910173493A CN 110048809 B CN110048809 B CN 110048809B
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
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Abstract
The invention discloses a dynamic transmission method for error-free fusion receiving of short wave multiple stations, which comprises the following steps that 1) a short wave communication system is built; 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 sending module dynamically transmits the short-wave signal to be sent. 3) And the short wave multi-site fusion receiving module performs fusion receiving processing on the received k-path short wave signals so as to restore the short wave signals. The method and the device have the advantages that data packet transmission and variable rate are provided according to the change of channel fading characteristics, packet length is dynamically graded and is matched with the multipath fading level of the channel, the success rate of multi-channel signal checking and packet selecting is increased, and the reliability of severe fading and unstable time communication of a short wave channel is improved.
Description
Technical Field
The invention relates to the field of short wave communication, in particular to a dynamic transmission method for error-free fusion receiving of short wave multiple stations.
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 the current shortwave communication research, the multi-channel signal combination processing by using diversity is mainly in a static fusion mode, that is, fixed transmission parameters are adopted, so that the method is difficult to adapt to changeable shortwave channels well, and especially, in a severe shortwave channel environment, the multi-channel hard combination causes information retransmission for many times due to unsatisfactory error check, thereby affecting the communication effect.
Disclosure of Invention
The present invention is directed to solving the problems of the prior art.
The technical scheme adopted for realizing the aim of the invention is that the dynamic transmission method for the error-free fusion receiving of the short wave multi-station 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 front-end signal sending module comprises a short wave channel quality evaluation system.
According to Doppler spread and multipath time delay in the short wave channel, the short wave channel quality evaluation system divides the short wave channel into three stages in a short wave channel quality descending manner, and the three stages are respectively marked as an I-stage channel, a II-stage channel and a III-stage channel.
The class I channel transmission rate is denoted v1And the packet length of the short-wave signal data packet is recorded as h1。
The class II channel transmission rate is denoted v2And the packet length of the short-wave signal data packet is recorded as h2。
The class III channel transmission rate is denoted v3And the packet length of the short-wave signal data packet is recorded as h3。
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 A1，A2，...，Ak.1, 2, k is a serial number.
The received digital signal matrix a is as follows:
in the formula, ak，nFor the nth signal received by the kth transceiver station. A. ther＝(ar，1，ar，2，…，ar，n) R is 1, 2. And a isr，1，ar，2，…，ar，n∈{0，1}。
k short wave modems receive digital signal sequence A through IP link1，A2，...，AkAnd sending the data packet to the fusion processing center.
2) And the front-end signal sending module dynamically transmits the short-wave signal to be sent.
The main steps of the front-end signal sending module for dynamically transmitting the short wave signal to be sent are as follows:
2.1) subpackaging the short wave signals to be transmitted, which mainly comprises the following steps:
2.1.1) packetizing the short-wave signal to be transmitted, the packet length of the data packet being set to h2。
2.1.2) attaching a packet sequence code to each data packet header.
2.1.3) carrying out CRC check on the whole sequence formed by the data packet and the packet sequence code, namely, adding the CRC check code after the data packet, thereby finishing the data packet setting.
2.2) Transmission Rate set to v at initial Transmission2. Front end signal sending module with transmission rate v2And transmitting the short-wave data packet to the k receiving/transmitting stations.
2.3) after k receiving/transmitting stations receive the data packet with the same serial number, performing CRC check on the data packet without check bits, checking whether error codes occur, and setting the short wave signal transmission rate of a front-end signal transmitting module and the packet length of the data packet according to the checking result, wherein the three conditions are mainly as follows:
I) if at least one receiving data CRC of the receiving/transmitting station is correct, the short wave multi-site fusion receiving module takes the receiving data with correct CRC as the receiving data. And the current channel quality level is unchanged.
II) if the data packets received by the k receiving/transmitting stations have error codes, any receiving/transmitting station of the shortwave multi-station fusion receiving module sends a data retransmission request to the front-end signal sending module.
And after the front-end signal sending module receives the data retransmission request, retransmitting the short-wave signal.
And if the data packets received by the k receiving/transmitting stations still have error codes after the short wave signals are retransmitted, the short wave multi-site fusion receiving module sends a short wave channel quality grade adjustment request to the front-end signal sending module.
And after receiving the channel quality grade adjustment request, the front-end signal sending module reduces the quality grade of the current short wave channel and resends the short wave signal according to the transmission rate corresponding to the quality grade of the short wave channel and the data packet length.
III) if at least one branch CRC is correct and more than p data packets are continuously not retransmitted, the shortwave multi-site fusion receiving module sends a shortwave channel quality grade adjustment request to the front-end signal sending module.
And after receiving the channel quality grade adjustment request, the front-end signal sending module improves the quality grade of the current short wave channel and resends the short wave signal according to the transmission rate corresponding to the quality grade of the short wave channel and the data packet length.
3) And the short wave multi-site fusion receiving module performs fusion receiving processing on the received k-path short wave signals so as to restore the short wave signals.
The short wave multi-site fusion receiving module performs fusion receiving processing on the received k-path short wave signals mainly comprises the following steps:
3.1) k receiving/transmitting stations send the received digital signals to the fusion processing center.
And 3.2) performing CRC (cyclic redundancy check) on the data packets of the received digital signals by the fusion processing center, and taking the error-free received digital signals as final received signal sequences if at least one path of received digital signals has no errors.
If the k paths of received digital signals have errors, judging whether the received digital signals belong to retransmission signals, if not, sending a data retransmission request to a front-end signal sending module by any receiving/sending station of the short-wave multi-site fusion receiving module. And after the front-end signal sending module receives the data retransmission request, retransmitting the short-wave signal.
If the received digital signal is a retransmission signal, further judging whether the current channel quality grade is III grade, if not, reducing the current channel quality grade by the front-end signal sending module, retransmitting the short-wave signal, and if so, giving up the received digital signal.
The technical effect of the present invention is undoubted. The method and the device have the advantages that data packet transmission and variable rate are provided according to the change of channel fading characteristics, packet length is dynamically graded and is matched with the multipath fading level of the channel, the success rate of multi-channel signal checking and packet selecting is increased, and the reliability of severe fading and unstable time communication of a short wave channel is improved.
Drawings
FIG. 1 is a short-wave multi-channel convergence receiving architecture;
FIG. 2 is a schematic diagram of a shift transmission;
fig. 3 is a flow chart of the convergence reception.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is 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:
referring to fig. 1 to fig. 3, a short-wave multi-station error-free fusion receiving dynamic transmission method mainly includes 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.
In an emergency, the information transmitted by the head-end station is received by multiple stations, as shown in fig. 1. 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 front-end signal sending module comprises a short wave channel quality evaluation system.
According to Doppler spread and multipath time delay in the short wave channel, the short wave channel quality evaluation system divides the short wave channel into three stages in a short wave channel quality descending manner, and the three stages are respectively marked as an I-stage channel, a II-stage channel and a III-stage channel.
The class I channel transmission rate is denoted v1And the packet length of the short-wave signal data packet is recorded as h1。
The class II channel transmission rate is denoted v2And the packet length of the short-wave signal data packet is recorded as h2。
The class III channel transmission rate is denoted v3And the packet length of the short-wave signal data packet is recorded as h3。
A reference value of 0.8-v1≤2、0.4≤v2≤0.7、0.1≤v3Less than or equal to 0.3, and the unit is kbit/s. The reference value is 128-h1≤256、32≤v2≤64、16≤v3Less than or equal to 24, and the unit is bit.
The short wave channel is a variable parameter channel, the Doppler frequency shift and the multipath transmission cause the severe expansion of short wave signals in time, frequency and space three-dimensional space, and the short wave channel is a key factor influencing the reliability of short wave communication. According to two parameters of Doppler expansion and multipath time delay in the short wave channel, the short wave channel is divided into three conditions of good, medium and bad, namely, the quality of the short wave channel is divided into three levels.
The short wave channel quality evaluation system can be AN/TRQ-35CV, AN/ARC-190CV of Rockwell & Collins company, RF-100 series of Harris company, CHX200 of Simens company of Germany, ARCOTEL system of AEG company of Germany, HF-850CALLS of Rohde & Schwartz company, MESA and HF-2000 of Tadiran company of Israel, BF-3200 of China, TCP-724, MSR-8000 and the like.
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 A1，A2，...，Ak.1, 2, k is a serial number.
The received digital signal matrix a is as follows:
in the formula, ak，nFor the nth signal received by the kth transceiver station. A. ther＝(ar，1，ar，2，...，ar，n) R is 1, 2. And a isr，1，ar，2，...，ar，nE {0, 1 }. The elements in the received digital signal matrix a represent the signals received by the receiving/transmitting station. A. therRepresenting the sequence of signals received by the kth receiving/transmitting station.
k short wave modems receive digital signal sequence A through IP link1，A2，...，AkAnd sending the data packet to the fusion processing center.
2) And the front-end signal sending module dynamically transmits the short-wave signal to be sent.
The main steps of the front-end signal sending module for dynamically transmitting the short wave signal to be sent are as follows:
2.1) subpackaging the short wave signals to be transmitted, which mainly comprises the following steps:
2.1.1) packetizing the short-wave signal to be transmitted, the packet length of the data packet being set to h2。
2.1.2) attaching a packet sequence code to each data packet header.
2.1.3) carrying out CRC check on the whole sequence formed by the data packet and the packet sequence code, namely, adding the CRC check code after the data packet, thereby finishing the data packet setting.
2.2) Transmission Rate set to v at initial Transmission2. Front end signal sending module with transmission rate v2And transmitting the short-wave data packet to the k receiving/transmitting stations.
2.3) after k receiving/transmitting stations receive the data packet with the same serial number, performing CRC check on the data packet without check bits, checking whether error codes occur, and setting the short wave signal transmission rate of a front-end signal transmitting module and the packet length of the data packet according to the checking result, wherein the three conditions are mainly as follows:
I) if at least one receiving data CRC of the receiving/transmitting station is correct, the short wave multi-site fusion receiving module takes the receiving data with correct CRC as the receiving data. And the current channel quality level is unchanged.
II) if the data packets received by the k receiving/transmitting stations have error codes, any receiving/transmitting station of the shortwave multi-station fusion receiving module sends a data retransmission request to the front-end signal sending module.
And after the front-end signal sending module receives the data retransmission request, retransmitting the short-wave signal.
And if the data packets received by the k receiving/transmitting stations still have error codes after the short wave signals are retransmitted, the short wave multi-site fusion receiving module sends a short wave channel quality grade adjustment request to the front-end signal sending module.
And after receiving the channel quality grade adjustment request, the front-end signal sending module reduces the quality grade of the current short wave channel and resends the short wave signal according to the transmission rate corresponding to the quality grade of the short wave channel and the data packet length.
III) if at least one branch CRC is correct and more than p data packets are continuously not retransmitted, the shortwave multi-site fusion receiving module sends a shortwave channel quality grade adjustment request to the front-end signal sending module.
And after receiving the channel quality grade adjustment request, the front-end signal sending module improves the quality grade of the current short wave channel and resends the short wave signal according to the transmission rate corresponding to the quality grade of the short wave channel and the data packet length.
3) And the short wave multi-site fusion receiving module performs fusion receiving processing on the received k-path short wave signals so as to restore the short wave signals.
The short wave multi-site fusion receiving module performs fusion receiving processing on the received k-path short wave signals mainly comprises the following steps:
3.1) k receiving/transmitting stations send the received digital signals to the fusion processing center.
And 3.2) performing CRC (cyclic redundancy check) on the data packets of the received digital signals by the fusion processing center, and taking the error-free received digital signals as final received signal sequences if at least one path of received digital signals has no errors.
If the k paths of received digital signals have errors, judging whether the received digital signals belong to retransmission signals, if not, sending a data retransmission request to a front-end signal sending module by any receiving/sending station of the short-wave multi-site fusion receiving module. And after the front-end signal sending module receives the data retransmission request, retransmitting the short-wave signal.
If the received digital signal is a retransmission signal, further judging whether the current channel quality grade is III grade, if not, reducing the current channel quality grade by the front-end signal sending module, retransmitting the short-wave signal, and if so, giving up the received digital signal.
Claims (4)
1. A dynamic transmission method for error-free fusion reception of short wave multiple stations is characterized by mainly comprising the following steps:
1) building the 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) the front-end signal sending module dynamically transmits short-wave signals to be sent;
the main steps of the front-end signal sending module for dynamically transmitting the short wave signal to be sent are as follows:
2.1) subpackaging the short wave signals to be transmitted, which mainly comprises the following steps:
2.1.1) packetizing the short-wave signal to be transmitted, the packet length of the data packet being set to h2；
2.1.2) attaching a packet sequence code to the head of each data packet;
2.1.3) carrying out CRC check on an integral sequence formed by the data packet and the packet sequence code, namely, attaching the CRC check code after the data packet, thereby finishing the data packet setting;
2.2) Transmission Rate set to v at initial Transmission2(ii) a Front end signal sending module with transmission rate v2Transmitting short wave data packets to k receiving/transmitting stations;
2.3) after k receiving/transmitting stations receive the data packet with the same serial number, performing CRC check on the data packet without check bits, checking whether error codes occur, and setting the short wave signal transmission rate of a front-end signal transmitting module and the packet length of the data packet according to the checking result, wherein the three conditions are mainly as follows:
I) if at least one receiving/transmitting station has correct CRC, the short wave multi-site fusion receiving module takes the receiving data with correct CRC as receiving data; and the quality grade of the current channel is not changed;
II) if the data packets received by the k receiving/transmitting stations have error codes, any receiving/transmitting station of the short wave multi-site fusion receiving module sends a data retransmission request to the front-end signal sending module;
after receiving the data retransmission request, the front-end signal sending module retransmits the short-wave signal;
if the data packets received by the k receiving/transmitting stations still have error codes after the retransmission of the short wave signals, the short wave multi-site fusion receiving module sends a short wave channel quality grade adjustment request to the front-end signal sending module;
after receiving a channel quality grade adjustment request, a front-end signal sending module reduces the quality grade of the current short-wave channel and resends the short-wave signal according to the transmission rate corresponding to the quality grade of the short-wave channel and the packet length of the data packet;
III) if at least one branch CRC is correct and more than p data packets are continuously not retransmitted, the short wave multi-site fusion receiving module sends a short wave channel quality grade adjustment request to the front end signal sending module;
after receiving a channel quality grade adjustment request, a front-end signal sending module improves the quality grade of the current short-wave channel and resends the short-wave signal according to the transmission rate corresponding to the quality grade of the short-wave channel and the packet length of the data packet;
3) and the short wave multi-site fusion receiving module performs fusion receiving processing on the received k-path short wave signals so as to restore the short wave signals.
2. The dynamic transmission method for error-free fusion reception of the short-wave multi-station according to claim 1, characterized in that: 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;
k receiving/transmitting stations receive short wave signals sent by the front end signal sending 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 A1，A2，...，Ak(ii) a 1, 2, k is a serial number;
the received digital signal matrix a is as follows:
in the formula, ak，nAn nth signal received for a kth receiving/transmitting station; a. ther＝（ar，1，ar，2，...，ar，n) R 1, 2.., k; and a isr，1，ar，2，...，ar，n∈{0，1}；
k short wave modems receive digital signal sequence A through IP link1，A2，...，AkAnd sending the data packet to the fusion processing center.
3. The dynamic transmission method for error-free fusion reception of the short-wave multi-station according to claim 1, characterized in that: the front-end signal sending module comprises a short wave channel quality evaluation system;
according to Doppler spread and multipath time delay in the short wave channel, the short wave channel quality evaluation system divides the short wave channel into three stages in a quality descending manner of the short wave channel, and the three stages are respectively marked as an I-stage channel, a II-stage channel and a III-stage channel;
the class I channel transmission rate is denoted v1And the packet length of the short-wave signal data packet is recorded as h1；
The class II channel transmission rate is denoted v2And the packet length of the short-wave signal data packet is recorded as h2；
The class III channel transmission rate is denoted v3And the packet length of the short-wave signal data packet is recorded as h3。
4. The dynamic transmission method for error-free fusion reception of the short-wave multi-station according to claim 1, wherein the short-wave multi-station fusion reception module performs fusion reception processing on the received k-path short-wave signals mainly by the following steps:
1) k receiving/sending stations send the received digital signals to a fusion processing center;
2) the fusion processing center carries out CRC (cyclic redundancy check) on the data packets of the received digital signals, and if at least one path of the received digital signals has no error, the error-free received digital signals are used as a final received signal sequence;
if the k paths of received digital signals have errors, judging whether the received digital signals belong to retransmission signals, if not, sending a data retransmission request to a front-end signal sending module by any receiving/sending station of the short-wave multi-site fusion receiving module; after receiving the data retransmission request, the front-end signal sending module retransmits the short-wave signal;
if the received digital signal is a retransmission signal, further judging whether the current channel quality grade is III grade, if not, reducing the current channel quality grade by the front-end signal sending module, retransmitting the short-wave signal, and if so, giving up the received digital signal.
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