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Affine projection decoding method used in downlink multiuser multi-input multi-output (MIMO) system

A technique of affine projection and decoding method, which is applied in the application field of affine projection method in downlink multi-user multiple-input multiple-output system (MIMO)

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

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Problems solved by technology

Suppose K≤M≤N

Method used

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  • Affine projection decoding method used in downlink multiuser multi-input multi-output (MIMO) system
  • Affine projection decoding method used in downlink multiuser multi-input multi-output (MIMO) system
  • Affine projection decoding method used in downlink multiuser multi-input multi-output (MIMO) system

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Embodiment 1

[0043] It is assumed that the system has 2 transmitting antennas, 2 users each have 2 receiving antennas, and the transmission time interval is T=2. The constellation uses 4-QAM, the total energy is 4, and the transmission rate is 4-bit pcu. The system model is Send signal matrix X=(x 1 ,x 2 ) t , where x 1 , is the message sent to the first user, x 2 is the information sent to the second user, then the sending and receiving equation is written as

[0044] Y = p M h 1 h 2 x 1 x 2 + W

[...

Embodiment 2

[0056] It is assumed that the system has 4 transmitting antennas, 4 users each have 4 receiving antennas, and the transmission time interval is T=2. The constellation uses 4-QAM, the total energy is 4, and the transmission rate is 8-bit pcu. The system model is Send signal matrix X=(x 1 ,x 2 ,x 3 ,x 4 ) t , where x 1 , is the message sent to the first user, x 2 is the message sent to the 2nd user, x 3 is the message sent to the 3rd user, x 4 is the information sent to the fourth user, then the sending and receiving equation is written as Y = p M h 1 h 2 h 3 h 4 ...

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Abstract

The invention discloses an affine projection decoding method used in a downlink multiuser multi-input multi-output (MIMO) system. The method includes the steps of: S1, processing H1 and H2 with polar decomposition and obtaining H1=PC1, H2=QC2, wherein P (Q) is unitary matrix of N*k (N*(M-k)), C1 (C2) is a positive definite matrix of k*k ((M-k)*(M-k)), letting U be a subspace composed of column vectors of P and letting V be a subspace composed of column vectors of Q, S2, simplifying a formula1 of an affine projection of Y on U along V, and obtaining a formula2, S3, multiplying PH by a formula3, S4, decoding information received by the ith user through a maximum likelihood decoding. The affine projection decoding method used in a MIMO system has the advantages that the affine projection method is capable of removing interference information among the multiple users of the downlink multiuser MIMO system when a sending terminal is unaware of channel state information, and information of a signal sent by the sending terminal.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to the technical field of wireless communication multi-antenna, in particular to a technology in which an affine projection method is applied in a downlink multi-user multiple-input multiple-output system (MIMO). Background technique [0002] At present, it has been proved theoretically and practically that the transmitter's complete or partial knowledge of the channel state information can improve the performance of multiple-input multiple-output (MIMO) systems. On the one hand, precoding for downlink multi-user MIMO communication is a method for preprocessing signals before transmission. It requires the transmitting end to obtain information related to the channel state, and use the channel state information to preprocess the signal at the transmitting end, eliminate the adjacent channel interference of the MIMO channel, and improve the system performance, so as to ...

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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