CN108833055A - Communication code method - Google Patents
Communication code method Download PDFInfo
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- CN108833055A CN108833055A CN201810497305.6A CN201810497305A CN108833055A CN 108833055 A CN108833055 A CN 108833055A CN 201810497305 A CN201810497305 A CN 201810497305A CN 108833055 A CN108833055 A CN 108833055A
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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
- H04L1/0057—Block codes
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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
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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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
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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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
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
Abstract
The present invention provides a kind of communication code method, including：Sending ending equipment encodes signal, including lead code, data packet, synchronous code and the protection interval being arranged successively.Low-rate data packet and high data rate packet emit simultaneously, and receiving device receives the signal of form of data frames, carry out correlation analysis to lead code, judge whether to capture signal；If capturing signal, low-rate data packet is further captured, recycles low-rate data packet to carry out channel estimation, extrapolates the frequency deviation and code phase of high data rate packet；By the frequency deviation and code phase of high data rate packet, further aided capture to high data rate packet improves capture, synchronization and the decoding capability of high data rate packet.It has the following advantages that：Communication code method provided by the invention can make equipment under the premise of guaranteeing that data throughput is constant, and the sensitivity of the sensitivity and theoretical formula method that make equipment is closest, and improve the reliability of system.
Description
Technical field
The invention belongs to communication code technical fields, and in particular to a kind of communication code method.
Background technique
Communicate according to traditional understanding be exactly information transmission.The effect of communication system is exactly to send information to from information source
One and multiple destinations.Signal is sent into channel by sending device, and phase is done to the signal received using receiving device in receiving end
The processing answered, the message content sent.Wherein, when signal transmits in the channel, various interference can be generated to signal and are made an uproar
Sound.Noise be for the transmission of signal it is harmful, it can be such that analog signal is distorted, and make digital signal that error code occur, and limit letter
The transmission rate of breath.Different coding modes has direct relationship to channel estimating performance, sensitivity, data throughput.Therefore,
How a kind of coding mode is provided, under the premise of so that equipment is guaranteed that data throughput is constant, makes the sensitivity and theoretical formula of equipment
The sensitivity of calculating is closest, and improves the reliability of system, is thing in the urgent need to address at present.
Summary of the invention
In view of the defects existing in the prior art, the present invention provides a kind of communication code method, can effectively solve the above problems.
The technical solution adopted by the present invention is as follows：
The present invention provides a kind of communication code method, includes the following steps：
Step 1, sending ending equipment obtains signal to be encoded；
Step 2, sending ending equipment encodes signal, obtains the signal of form of data frames, the format of the data frame
For：Including be arranged successively lead code, the 1st data packet, the 1st synchronous code, the 1st protection interval, the 2nd data packet, the 2nd synchronous code,
2nd protection interval, ..., the n-th data packet, the n-th synchronous code, the n-th protection interval；Wherein, for n data packet, the number of the first half
It is the low-rate data packet of signal according to packet, the data packet of later half is the high data rate packet of signal；
Step 3, the signal of the form of data frames that sending ending equipment obtains step 2 is sent into channel, and to receiving device
Transmission；
Step 4, receiving device receives the signal of the form of data frames, and before capturing the signal of form of data frames
Leading code carries out correlation analysis to lead code, judges whether to capture signal；If capturing signal, further capture
The signal gain of low-rate data packet, low-rate data packet is high, guarantees to capture signal in the lower situation of signal power；When
After capturing low-rate data packet, using low-rate data packet carry out channel estimation, extrapolate high data rate packet frequency deviation and
Code phase；By the frequency deviation and code phase of high data rate packet, further aided capture to high data rate packet improves high-speed
Capture, synchronization and the decoding capability of data packet.
Preferably, synchronous code realizes the continuous estimation to channel for correcting Doppler shift.
Preferably, the low-rate data packet is 10K low-rate data packet；The high data rate packet is 2M high-speed number
According to packet.
Communication code method provided by the invention has the following advantages that：
Communication code method provided by the invention can make equipment under the premise of guaranteeing that data throughput is constant, make to set
The sensitivity of standby sensitivity and theoretical formula method is closest, and improves the reliability of system.
Detailed description of the invention
Fig. 1 is the flow diagram of communication code method provided by the invention.
Fig. 2 is the format chart of data frame provided by the invention.
Specific embodiment
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein only to
It explains the present invention, is not intended to limit the present invention.
Design background of the present invention is long term distance communication, designs frame structure under conditions of certain bit rate (10M), if letter
Breath rate (data throughput) is higher, and coding gain decline, space attenuation becomes larger, and not can guarantee long term distance communication, therefore be
The communication for realizing long term distance, High Data Rate, devises communication code method of the invention.
The present invention makes equipment under the premise of guaranteeing that data throughput is constant, makes equipment by designing novel coding
Sensitivity and the sensitivity of theoretical formula method are closest, and improve the reliability of system.
A kind of communication code method provided by the invention, major design are contemplated that：Information frame structure is by leading, low rate
Packet, high rate packet, synchronous code, frame protection interval composition.2M high speed signal and 10K low speed signal are encoded to a data frame,
And emit simultaneously.Receiving end receives signal, receives signal and whether local leading progress correlated judgment captures signal, if catching
Signal is received, then carries out channel estimation, the frequency departure of revise signal, phase deviation, while calculating the frequency of high speed signal
Deviation and phase deviation improve the ability of high speed signal decoding with aided capture high speed signal.Synchronous code in data frame is used for
Synchronization, the decoding of data are realized in continuous channel estimation.
Communication code method specifically includes following steps with reference to Fig. 1：
Step 1, sending ending equipment obtains signal to be encoded；
Step 2, sending ending equipment encodes signal, obtains the signal of form of data frames, the format of the data frame
For：Including be arranged successively lead code, the 1st data packet, the 1st synchronous code, the 1st protection interval, the 2nd data packet, the 2nd synchronous code,
2nd protection interval, ..., the n-th data packet, the n-th synchronous code, the n-th protection interval；Wherein, for n data packet, the number of the first half
It is the low-rate data packet of signal according to packet, the data packet of later half is the high data rate packet of signal；Wherein frame structure is leading
Code gain with higher, guarantee can capture signal, and determine the position of signal, carry out channel estimation and obtain the frequency of signal
Rate deviation；Synchronous code realizes the continuous estimation to channel for correcting Doppler shift.Low-rate data packet is 10K low rate
Data packet；High data rate packet is 2M high data rate packet.
Step 3, the signal of the form of data frames that sending ending equipment obtains step 2 is sent into channel, and to receiving device
Transmission；
Step 4, receiving device receives the signal of the form of data frames, and before capturing the signal of form of data frames
Leading code carries out correlation analysis to lead code, judges whether to capture signal；If capturing signal, further capture
The signal gain of low-rate data packet, low-rate data packet is high, guarantees to capture signal in the lower situation of signal power；When
After capturing low-rate data packet, using low-rate data packet carry out channel estimation, extrapolate high data rate packet frequency deviation and
Code phase；By the frequency deviation and code phase of high data rate packet, further aided capture to high data rate packet improves high-speed
Capture, synchronization and the decoding capability of data packet.
Wherein, synchronous code realizes the continuous estimation to channel for correcting Doppler shift.The low-rate data packet is
10K low-rate data packet；The high data rate packet is 2M high data rate packet.
The content of each data packet includes data packet count, sends message length instruction, CRC check, information bit, the letter
Breath bit has already passed through coded treatment, and the correctness for receiving information can be improved in this way.
It can be seen that 2M high speed signal and 10K low speed signal are encoded to a data frame, and send out simultaneously in the present invention
It penetrates.When frame structure design, low speed signal information rate is low, therefore low speed signal high gain (high 22db, relative to high speed signal
Speech), it can guarantee to capture signal in the lower situation of signal power by design, when capturing low speed signal, utilize
Low speed signal carries out channel estimation, extrapolates the frequency deviation and code phase of high speed signal, and aided capture high speed signal improves high speed and believes
Number capture, synchronization, decoding capability, realize 2M high speed data transfer.
Communication code method provided by the invention has the following advantages that：
(1) correctness for receiving information can be improved in the coding mode of information, reduces and misses under conditions of certain signal-to-noise ratio
Code rate keeps system sensitivity and theoretical sensitivity closest.
(2) if 2M high speed signal can be captured, synchronizes, be decoded, system can be run with the data transfer rate of 2M+10K.Both make 2M
High speed data capture is less than can not decode, 10K low speed data can be with normal transmission, although transmission data rate is low, but system
System reliability can be improved with normal operation.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
Depending on protection scope of the present invention.
Claims (3)
1. a kind of communication code method, which is characterized in that include the following steps：
Step 1, sending ending equipment obtains signal to be encoded；
Step 2, sending ending equipment encodes signal, obtains the signal of form of data frames, and the format of the data frame is：Packet
Include the lead code being arranged successively, the 1st data packet, the 1st synchronous code, the 1st protection interval, the 2nd data packet, the 2nd synchronous code, the 2nd guarantor
Shield interval, ..., the n-th data packet, the n-th synchronous code, the n-th protection interval；Wherein, for n data packet, the data packet of the first half
For the low-rate data packet of signal, the data packet of later half is the high data rate packet of signal；
Step 3, the signal for the form of data frames that sending ending equipment obtains step 2 is sent into channel, and transmits to receiving device；
Step 4, receiving device receives the signal of the form of data frames, and capture form of data frames signal it is leading
Code carries out correlation analysis to lead code, judges whether to capture signal；If capturing signal, further capture low
The signal gain of speed data packet, low-rate data packet is high, guarantees to capture signal in the lower situation of signal power；When catching
After receiving low-rate data packet, channel estimation is carried out using low-rate data packet, extrapolates the frequency deviation and code of high data rate packet
Phase；By the frequency deviation and code phase of high data rate packet, further aided capture to high data rate packet improves high-speed number
According to the capture, synchronization and decoding capability of packet.
2. communication code method according to claim 1, which is characterized in that synchronous code is real for correcting Doppler shift
Now to the continuous estimation of channel.
3. communication code method according to claim 1, which is characterized in that the low-rate data packet is 10K low rate
Data packet；The high data rate packet is 2M high data rate packet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810497305.6A CN108833055A (en) | 2018-05-22 | 2018-05-22 | Communication code method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810497305.6A CN108833055A (en) | 2018-05-22 | 2018-05-22 | Communication code method |
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| CN108833055A true CN108833055A (en) | 2018-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162699A (en) * | 2021-03-31 | 2021-07-23 | 中国科学院地质与地球物理研究所 | Underwater acoustic communication method and device |
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| CN101401358A (en) * | 2006-03-29 | 2009-04-01 | 三星电子株式会社 | Method and system for channel access control for transmission of video information over wireless channels |
| CN102624487A (en) * | 2012-03-09 | 2012-08-01 | 清华大学 | Variable rate coding communication device applicable to satellite interrupted channel |
| CN105453467A (en) * | 2013-10-18 | 2016-03-30 | 华为技术有限公司 | Transmission and receiving method in a wireless communication system |
| CN106341357A (en) * | 2015-07-07 | 2017-01-18 | 中国移动通信集团公司 | Downlink frequency deviation compensation method and device |
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Patent Citations (5)
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| CN101401358A (en) * | 2006-03-29 | 2009-04-01 | 三星电子株式会社 | Method and system for channel access control for transmission of video information over wireless channels |
| CN102624487A (en) * | 2012-03-09 | 2012-08-01 | 清华大学 | Variable rate coding communication device applicable to satellite interrupted channel |
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| US20160234844A1 (en) * | 2013-10-18 | 2016-08-11 | Huawei Technologies Co., Ltd. | Transmission and Receiving Method in a Wireless Communication System |
| CN106341357A (en) * | 2015-07-07 | 2017-01-18 | 中国移动通信集团公司 | Downlink frequency deviation compensation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113162699A (en) * | 2021-03-31 | 2021-07-23 | 中国科学院地质与地球物理研究所 | Underwater acoustic communication method and device |
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