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Double-antenna multi-carrier wave MIMO (multi-input and multi-output) system based on mutual complementing codes

A complementary code and multi-carrier technology, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve the problems of poor anti-multi-user interference performance, poor anti-multipath interference performance, and poor anti-Doppler effect ability. Achieve the effect of improving anti-multi-user interference performance

Inactive Publication Date: 2012-03-28
HARBIN INST OF TECH
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Problems solved by technology

[0005] The present invention aims to solve the problems of poor anti-multi-user interference performance, poor anti-multipath interference performance, and poor anti-Doppler effect ability of the MIMO system adopting the existing coding mode, thereby providing a dual-antenna multi-carrier based on complementary codes MIMO system

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  • Double-antenna multi-carrier wave MIMO (multi-input and multi-output) system based on mutual complementing codes
  • Double-antenna multi-carrier wave MIMO (multi-input and multi-output) system based on mutual complementing codes
  • Double-antenna multi-carrier wave MIMO (multi-input and multi-output) system based on mutual complementing codes

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specific Embodiment approach 1

[0027] Specific implementation mode 1. Combination Figure 1 to Figure 3 Describe this specific implementation mode, a dual-antenna multi-carrier MIMO system based on complementary codes,

[0028] For each of the K users, its signal transmission process is:

[0029] Step 1. The data is converted into two sets of parallel data through serial-to-parallel conversion or duplication, and each set of data is converted into N-way parallel data through duplication, and K and N are positive integers;

[0030] Step 2, the N-way data in each group of data are respectively spread by using N groups of complementary codes;

[0031] Step 3, using N channels of spread spectrum data in each group of data obtained in step 2 to perform QPSK modulation using N subcarriers respectively to obtain N channels of modulation results, and combining the gain of the N channels of modulation results into one channel of transmission signals; Two sets of data obtained a total of two transmission signals; ...

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Abstract

A double-antenna multi-carrier wave MIMO (multi-input and multi-output) communication method based on mutual complementing codes relates to a double-antenna multi-carrier wave communication method based on mutual complementing codes and solves the problems that the existing encoded MIMO system is poor in multi-user interference resisting performance, poor in multi-path interference resisting performance, and poor in Doppler effect capacity. The system adopts the mutual complementing codes to carry out spread spectrum, and adopts a multi-carrier wave system framework in signal emitting process; and the system adopts the mutual complementing codes to carry out demodulation spread in signal receiving process. The system adopts the mutual complementing codes to be used as spread spectrum codes of system carrier waves and adopts the multi-carrier wave system framework, so that the multi-user interference resisting performance of the MIMO system is greatly improved, under an AWGN (additive white Gaussian noise) channel, the complete multi-user interference resisting performance can be realized, under time selective fading brought by Doppler frequency shift, the system can resist multi-user interference with 75 percent rate, and under frequency selective fading caused by multi-path interference, the system can resist the multi-user interference with 50 percent rate.

Description

technical field [0001] The invention relates to a dual-antenna multi-carrier communication system based on complementary codes. Background technique [0002] In the mid-1990s, Bell Laboratories in the United States proposed a multi-antenna communication system represented by MIMO (multiple input multiple output) technology that introduced airspace processing technology, and conducted a comprehensive review of its coding technology scheme and signal processing technology. elaborate. Since then, MIMO technology has become a common hotspot in the communication industry and academia, and has achieved rapid development. The biggest advantage of MIMO technology is that the use of space diversity (Space diversity) technology allows the system to increase the transmission rate and reduce the error rate without increasing spectrum resources and antenna transmission power. Information theory has proved that: when the channel between each transmitting antenna and the receiving channe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08
Inventor 陈晓华孙思月孟维晓
Owner HARBIN INST OF TECH
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