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Multi-input Multi-output communication system

A communication system, multi-output technology, applied in the direction of transmission system, diversity/multi-antenna system, transmission control/equalization, etc., can solve the problem of large bandwidth resource consumption, achieve transmission rate improvement, eliminate multipath interference, and bit errors The effect of rate reduction

Active Publication Date: 2014-02-19
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 is to solve the problem of large consumption of bandwidth resources in the traditional complementary stirring code division multiple access technology, and now provides a multi-input multi-output communication system

Method used

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specific Embodiment approach 1

[0015] Specific implementation mode one: the MIMO communication system described in this implementation mode, in this system, complementary stirring code division multiple access coding is used to eliminate interference, and the complementary stirring code is:

[0016]

[0017] Among them, k is the number of users at the transmitting end, N t is the number of transmitting antennas, N is the code length, N≤N t , M is the number of carriers, and both M and N are positive integers.

[0018] Complementary stirring code division multiple access technology uses the stirring technology, which can reduce the bandwidth utilization rate by 1 / N under the condition that the same carrier and code length are both N. Table 1 is a comparison table of the bandwidth efficiency of the traditional complementary code division multiple access system and the bandwidth efficiency of the stirring code division multiple access system.

[0019] Table 1

[0020]

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment is a further description of the MIMO communication system described in Embodiment 1. In this embodiment, the complementary mixing code is obtained through the following steps:

[0022] Step 1: Establish orthogonal matrices A and D

[0023]

[0024] Then perform step two;

[0025] Step 2: Multiply the orthogonal matrix A by the orthogonal matrix D to obtain the complementary stirred code division multiple access coding matrix C (k)

[0026] C ( k ) = C n t , 1 , t ( k ) ...

specific Embodiment approach 3

[0037] Specific implementation mode three: refer to figure 2 Describe this embodiment in detail. This embodiment is a further description of the MIMO communication system described in Embodiment 1 or 2. In this embodiment, the method for scrambling at the signal transmitting end using a complementary stirring code is as follows:

[0038] user data B. (k) At the signal transmitting end, it is copied to each antenna through a duplicator, and the user data copied to each antenna is scrambled by the following method using complementary stirring code division multiple access coding:

[0039] B ( k ) C n t , m ( k ) = b 1 ...

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Abstract

The invention provides a multi-input multi-output communication system, which belongs to the communication field, and aims at solving the problem of large bandwidth resource consumption in traditional complementary or stirred CDMA (Code Division Multiple Access) technology. The multi-input multi-output communication system uses complementary stirred codes, instead of direct-sequence spread spectrum codes in a prior direct-sequence spread-spectrum multi-input multi-output complementary CDMA system, to eliminate multipath interference, wherein traditional complementary CDMA uses a spread spectrum technology, the complementary stirred codes use a stirring technology, and the bandwidth utilization rate is decreased by 1 / N under the same carrier waves and the same coding lengths (N). Multiple emission antennae and multiple reception antennae are used at the emission end and the reception end via a multi-input multi-output technology, so that the error rate is reduced by 80%, and the transmission rate is increased by 75%. The multi-input multi-output communication system is suitable for eliminating the multipath interference in the complementary stirred CDMA technology.

Description

technical field [0001] The invention belongs to the communication field, in particular to a multiple-input multiple-output communication system in the communication field. Background technique [0002] The traditional Direct-sequence Spread Spectrum Multiple Input and Output Complementary Code Division Multiple Access (Direct-sequence Multiple Access) system uses codes to distinguish antennas. Since the data transmitted by different antennas can be separated by codes, it can realize multiple access transmission or space diversity. But 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, but direct-sequence spread spectrum technology consumes a lot of bandwidth, especially when transmitting data faster and faster. Since the traditional multi-antenna complement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B1/10H04B7/005
Inventor 陈晓华刘权孟维晓许宏铭
Owner HARBIN INST OF TECH
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