CN105141392A - Correlation peak location based code division multiple access (CDMA) signal modulation communication method - Google Patents
Correlation peak location based code division multiple access (CDMA) signal modulation communication method Download PDFInfo
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- CN105141392A CN105141392A CN201510446374.0A CN201510446374A CN105141392A CN 105141392 A CN105141392 A CN 105141392A CN 201510446374 A CN201510446374 A CN 201510446374A CN 105141392 A CN105141392 A CN 105141392A
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Abstract
The invention relates to a correlation peak location based code division multiple access (CDMA) signal modulation communication method, belonging to the field of communication and aiming at solving the problem of low information rate of an existing CDMA signal. The method comprises a first step of in a transmitting end, quantifying to-be-sent information into N-scale number I, wherein N is a code length of a spreading code; a second step of performing I-bit cyclic shift on a pseudorandom sequence of corresponding bit of the N-scale number I; a third step of transmitting a signal by the transmitting end; a fourth step of synchronizing the transmitting end and a receiving end; a fifth step of in the receiving end, performing signal detection by use of a correlator; a sixth step of recording a correlation peak location detected by the correlator, wherein the correlation peak location at present is I; and a seventh step of recovering I to be raw material according to a communication protocol. The method is applied to communication of the CDMA signal.
Description
Technical field
The invention belongs to the communications field.
Background technology
Current CDMA signal is the bit come by one or more groups pseudo random sequence in alternative traditional communication, to realize spread spectrum, and the function of synchronous and multiple access.The pseudo random sequence order that each bit is corresponding is constant, so it is also constant to obtain the correlation peak location of each bit at receiving terminal.
In the middle of the process accepting CDMA signal at receiving terminal, correlator is the essential core part of its signal monitoring.One group of spreading code loopy moving, what correlator Output rusults embodied is the change of the correlation peak location of correlation function, as shown in Figure 1.
If the correlation peak location that receiving terminal is received can be controlled artificially, then can carry out carry information by correlation peak location, improve information rate.
Summary of the invention
The object of the invention is the problem that information rate in order to solve existing CDMA signal is low, the invention provides a kind of communication means of the CDMA signal madulation based on correlation peak location.
The communication means of the CDMA signal madulation based on correlation peak location of the present invention, described method comprises the steps:
Step one: at transmitting terminal, be N system number I by information quantization to be sent, N is the code length of spreading code;
Step 2: carry out the cyclic shift of I position to the pseudo random sequence in N system number I corresponding bits;
Step 3: transmitting terminal transmits;
Step 4: transmitting terminal carries out synchronous with receiving terminal;
Step 5: at receiving terminal, carries out input by correlator;
Step 6: the correlation peak location detected by correlator carries out record, now the position of relevant peaks should be I;
Step 7: according to communication protocol, reverts to raw information by I.
Described step 4 is that employing adds pilot tone, GNSS time service or atomic clock calibrating mode and makes transmitting terminal synchronous with receiving terminal.
Beneficial effect of the present invention is, the code phase location that the present invention is detected by change receiving terminal carrys out carry information, thus increases the information rate of CDMA signal.After adopting this method, in conventional CDMA system, not by the positive and negative reversion carry information of code character, the information that each bit carries is promoted to N system number from 2 system numbers; By the positive and negative reversion carry information of code character, the information that each bit carries is promoted to 2N system number from 2 system numbers, and the used time is constant.Amount of information (information rate) in unit interval has become original N/2 or N times
Accompanying drawing explanation
Fig. 1 is the principle schematic of traditional CDMA signal.
Fig. 2 is the principle schematic of the communication means of the CDMA signal madulation based on correlation peak location of the present invention.
Fig. 3 is the CDMA signal of the modulation adopting method of the present invention to obtain in embodiment.
Embodiment
Composition graphs 2 illustrates present embodiment, the communication means of the CDMA signal madulation based on correlation peak location described in present embodiment, for gps system, although the spreading code cycle is 1023, but because every bit comprises the frequency expansion sequence in 20 cycles, therefore the code length N of spreading code should be 1023*20; Information quantization to be sent is N system number I by step one: at transmitting terminal; Step 2: carry out the cyclic shift of I position to the pseudo random sequence in N system number I corresponding bits; Step 3: transmitting terminal transmits; Step 4: owing to sacrificing synchronizing capacity, so can add a pilot tone to remain synchronous, namely provides synchronous, the two synchronized transmissions with the traditional C DMA signal B improving signal A Complete Synchronization to improving signal by one;
Step 5: at receiving terminal, after completing synchronously (and incidentally transmitting a small amount of information in a conventional manner) by signal B, the local code character connecing the correlator of end relevant to signal A is just ready, and line correlation of going forward side by side detects; Step 6: the correlation peak location that signal A is detected, the correlation peak location detected by correlator carries out record, and now the position of relevant peaks should be I; Step 7: according to communication protocol, reverts to raw information by I, carries out the transmission compared with large information capacity.
Adopt present embodiment, the CDMA signal after one section of improvement should as shown in Figure 3, the corresponding group code sequence of each information bit, and the original position of code sequence is modulated according to the information that will transmit.Not being both of original position is realized by cyclic shift.The relevant peaks that receiving terminal obtains then can change according to the degree difference of cyclic shift, thus realizes the transmission of more information.
The cost that the present invention greatly improves the information rate of CDMA signal sacrifices the synchronizing function that CDMA signal itself has, therefore need extra synchronizing process, as added pilot tone, and GNSS time service, atomic clock calibration etc.The present invention does not repel the mode of original CDMA signal carry information, namely by the mode of the positive and negative reversion carry information of spread spectrum code character; That is, after adopting this kind of means, the present invention still by the positive and negative reversion of code character to additional extension one times of amount of information again of each spreading code cycle, after making the amount of information of each cycle spreading code rise to N system from 2 systems, can rise to 2N system further.
Claims (2)
1. based on a communication means for the CDMA signal madulation of correlation peak location, it is characterized in that, described method comprises the steps:
Step one: at transmitting terminal, be N system number I by information quantization to be sent, N is the code length of spreading code;
Step 2: carry out the cyclic shift of I position to the pseudo random sequence in N system number I corresponding bits;
Step 3: transmitting terminal transmits;
Step 4: transmitting terminal carries out synchronous with receiving terminal;
Step 5: at receiving terminal, carries out input by correlator;
Step 6: the correlation peak location detected by correlator carries out record, now the position of relevant peaks should be I;
Step 7: according to communication protocol, reverts to raw information by I.
2. the communication means of the CDMA signal madulation based on correlation peak location according to claim 1, is characterized in that, described step 4 is that employing adds pilot tone, GNSS time service or atomic clock calibrating mode and makes transmitting terminal synchronous with receiving terminal.
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| CN201510446374.0A CN105141392A (en) | 2015-07-27 | 2015-07-27 | Correlation peak location based code division multiple access (CDMA) signal modulation communication method |
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Citations (3)
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|---|---|---|---|---|
| CN101567727A (en) * | 2009-04-10 | 2009-10-28 | 西北工业大学 | Differential cyclic shift spread-spectrum underwater sound communication method |
| US20120039364A1 (en) * | 2007-08-31 | 2012-02-16 | Jeng-Kuang Hwang | Multi-carrier spread spectrum device using cyclic shift orthogonal keying, transmitter, receiver, and communication system thereof |
| CN103873106A (en) * | 2014-03-05 | 2014-06-18 | 北京理工大学 | Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method |
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2015
- 2015-07-27 CN CN201510446374.0A patent/CN105141392A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120039364A1 (en) * | 2007-08-31 | 2012-02-16 | Jeng-Kuang Hwang | Multi-carrier spread spectrum device using cyclic shift orthogonal keying, transmitter, receiver, and communication system thereof |
| CN101567727A (en) * | 2009-04-10 | 2009-10-28 | 西北工业大学 | Differential cyclic shift spread-spectrum underwater sound communication method |
| CN103873106A (en) * | 2014-03-05 | 2014-06-18 | 北京理工大学 | Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method |
Non-Patent Citations (1)
| Title |
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| 何成兵等: "循环移位扩频水声通信", 《物理学报》 * |
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