Affine projection decoding method of layered algebra space-time codes in downlink multi-user multiple-input-multiple-output system

A technology of affine projection and decoding method, which is applied in the field of layered algebraic space-time code, and can solve problems such as multipath fading and performance reduction of bit error rate at the receiver

Inactive Publication Date: 2013-05-22
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Multipath fading is a very serious problem in narrowband wireless communication systems, and the fading of signal amplitude will lead to the reduction of receiver bit error rate (BER) performance

Method used

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  • Affine projection decoding method of layered algebra space-time codes in downlink multi-user multiple-input-multiple-output system
  • Affine projection decoding method of layered algebra space-time codes in downlink multi-user multiple-input-multiple-output system
  • Affine projection decoding method of layered algebra space-time codes in downlink multi-user multiple-input-multiple-output system

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Embodiment 1

[0056] It is assumed that the system is equipped with 4 transmitting antennas, and 4 users each have 4 receiving antennas. The constellation uses 4-QAM with a total energy of 4. Transfer rate is 8 bit pcu. The transmit antenna system uses a fourth-order hierarchical space-time code.

[0057] Step 1: According to the decoding scheme above. First write the sending and receiving equation as

[0058] y 1 y 2 y 3 y 4 = p M h 1 h ...

Embodiment 2

[0079] It is assumed that the system has 2 transmitting antennas, 2 users each have 4 receiving antennas, and the sending time interval is T=2. The constellation uses 4-QAM, the total energy is 4 and the transmission rate is 8 bits pcu. The system model is The golden code is used as the sending signal matrix X, where x 1 , x 2 is the information sent to the first user, x 3 , x 4 is the information sent to the second user, then the sending and receiving equation is written as

[0080] y 1 y 2 = p M h 1 h 2 1 ...

Embodiment 3

[0102] It is assumed that the system has 2 transmitting antennas, 2 users each have 2 receiving antennas, and the sending time interval is T=2. The constellation uses 4-QAM, the total energy is 4, and the transfer rate is 4 bits pcu. The system model is The Alamouti code is used as the sending signal matrix X, where x 1 , is the information sent to the first user, x 2 is the information sent to the second user, then the sending and receiving equation is written as y 1 y 2 = p M h 1 h 2 x ...

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Abstract

The invention discloses an affine projection decoding method of layered algebra space-time codes in a downlink multi-user multiple-input-multiple-output system. The method includes the following steps: step 1. The received signals Y, channel matrixes H and noise matrixes W are respectively written in the column vector form; step 2. the channel matrixes are decomposed in different forms; step 3. polar decomposition is carried out on H11 and H12; step 4. Affine projection is carried out, namely, y1 is projected to U1 along V1; step 5. P1H is multiplied by R (y1), and repeat step 3, step 4 and step 5; step 6. the signal information received by the first user is decoded through maximum likelihood decoding.

Description

technical field [0001] The invention belongs to the field of wireless communication technology, especially the field of multi-antenna technology. Specifically, the layered algebraic space-time code suitable for point-to-point communication is applied to a downlink multi-user MIMO system by means of an affine projection method. In this application, the base station does not need any information about the channel. Background technique [0002] Multipath fading is a very serious problem in narrowband wireless communication systems, and the fading of signal amplitude will lead to the reduction of the bit error rate (BER) performance of the receiver. Diversity technology is widely used in wireless mobile communications to reduce the impact of multipath fading and improve transmission reliability without increasing transmit power or sacrificing communication bandwidth. Spatial multiplexing is to configure multiple antennas at both the transmitting end and the receiving end, make ...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04L1/00
Inventor 王海泉马路平侯林林陈瑞明陈勰
Owner HANGZHOU DIANZI UNIV
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