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Method for transmitting and receiving signal of complementary stirring code division multiple access system on basis of multi-path attenuation channels

A technology of multipath attenuation and code division multiple access, which is applied in the field of communication, can solve the problems of low transmission rate, high bit error rate, and high demand for bandwidth, and achieve the goal of increasing transmission rate, reducing bit error rate, and reducing bandwidth resources effect of demand

Active Publication Date: 2015-06-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of traditional direct-sequence spread spectrum MIMO CDMA system with high bandwidth requirements, high bit error rate and low transmission rate, and further provides complementary agitated code division based on multipath attenuation channel Signal transmission and reception method for multiple access system

Method used

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  • Method for transmitting and receiving signal of complementary stirring code division multiple access system on basis of multi-path attenuation channels
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  • Method for transmitting and receiving signal of complementary stirring code division multiple access system on basis of multi-path attenuation channels

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specific Embodiment approach 1

[0057] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, the signal transmission method of the complementary stirring code division multiple access system based on the multipath attenuation channel described in this embodiment, the transmission method is:

[0058] Step 1. Send the signal B to be sent (k) Data copied to N t pcs, N t is a positive integer greater than zero, k=1,2,...K;

[0059] Step 2. Convert each signal B (k) The data is then copied into M signals, where M is a positive integer greater than zero;

[0060] the nth t The m-th signal and code of the M signals corresponding to the signal Perform the stirring operation and get the signal no t =1,2,...N t , m is a positive integer greater than zero and less than M;

[0061] Step 3, the output signal obtained in step 2 and Carry out the product, and get the signal after the product the nth t The M modulated signals corresponding to the si...

specific Embodiment approach 2

[0062] Specific embodiment two: this embodiment further limits the signal transmission method of the complementary stirring code division multiple access system based on the multipath attenuation channel described in specific embodiment one, and in this embodiment, the method for stirring operation in step two:

[0063] The initial transmit signal is B ( k ) = [ b 1 ( k ) , b 2 ( k ) , . . . , b N ( k ) ] , - - - ( 2 - 1 ) ...

specific Embodiment approach 3

[0075] Specific implementation mode three: the following combination Figure 3 to Figure 7 Describe this embodiment, the signal receiving method of the complementary stirring code division multiple access system based on the multipath attenuation channel described in this embodiment, the signal receiving method of user k is:

[0076] Step 4, N at the receiving end r receiving antennas to receive the signal transmitted by the transmitter, N r is a positive integer greater than zero, and N t less than or equal to N r , the nth r The nth receiving antenna receives the nth t The superimposed signal transmitted by transmitting antennas, and by N r ×1-dimensional signal combined to form vector Y t , n r =1,2,...N r , vector Y t After being superimposed with N, the signal U is obtained t , N is the encoding degree;

[0077] Step five, the obtained signal U t Data copied to N r indivual;

[0078] Step 6. Convert each signal U t in f mThe carrier frequency is demodulate...

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Abstract

The invention discloses a method for transmitting and receiving signals of a complementary stirring code division multiple access system on the basis of multi-path attenuation channels, and relates to the field of communication. The method aims to solve problems of high bandwidth requirements and bit error rate and low transmission rate of the traditional direct-sequence spread-spectrum multiple-input-multiple-output complementary code division multiple access system. The method has the advantages that the method is combined with an MIMO (multiple-input-multiple-output) technology, a plurality of transmitting antennas and a plurality of receiving antennas are arranged at a transmitting end and a receiving end, accordingly, a bit error rate can be reduced and is comparably reduced by 15%, and a transmission rate can be increased and is comparably increased by 17%; bandwidth resources required by the complementary stirring code division multiple access system can be reduced and are comparably reduced by 20%; a stirring technology is combined with the traditional orthogonal complementary codes; a wireless channel transmission system is established among multiple users via multiple access; the method is applicable to the field of communication.

Description

technical field [0001] The present invention relates to the field of communication. Background technique [0002] The traditional Direct-sequence Spread Spectrum MIMO Complementary CDMA (Direct-sequence Multiple Access) system uses codes to distinguish antennas. Because the data transmitted by different antennas can be separated by codes, it can realize multiple access transmission or space diversity. At the same time, it also increases the demand for bandwidth, which does not meet the main concept of multiple input and multiple output. [0003] Traditional direct-sequence spread spectrum MIMO CDMA systems use direct-sequence spreading codes to eliminate interference, and direct-sequence spread spectrum technology consumes a lot of bandwidth, especially when transmitting data faster and faster. Since the traditional multi-antenna complementary code technology uses codes to separate the data transmitted by different antennas, the traditional multi-antenna complementary code ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/711H04B7/06H04B7/08
Inventor 陈晓华刘权孟维晓许宏铭
Owner HARBIN INST OF TECH