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Decoding method of Alamouti code combined with affine projection based on vector quantity superposition

A technology of affine projection and decoding method, which is applied in the directions of space transmit diversity, diversity/multi-antenna system, etc., to achieve the effect of good performance and reduced complexity

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

But these space-time codes can only be applied to point-to-point wireless communication

Method used

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  • Decoding method of Alamouti code combined with affine projection based on vector quantity superposition
  • Decoding method of Alamouti code combined with affine projection based on vector quantity superposition
  • Decoding method of Alamouti code combined with affine projection based on vector quantity superposition

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Experimental program
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Embodiment 1

[0054] 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 transmission signal matrix X. Simulation results such as figure 1 shown.

Embodiment 2

[0056] It is assumed that the system has 2 transmitting antennas, 2 users each have 3 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 2 bits pcu. The system model is The Alamouti code is used as the transmission signal matrix X. Simulation results such as figure 2 shown.

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Abstract

The invention discloses a decoding method of an Alamouti code combined with affine projection based on vector quantity superposition. The method includes that (1) an equation is spread; (2) assignment for y1, h1, h2, w1 and w2 is carried out and accordingly equations of the y1 and the y2 are obtained; (3) conjugate of the y1 and the y2 is obtained, and a column vector mode is formed; (4) polar decomposition is carried out on the H1 and H2 to obtain H1=PC1 and H2=QC2, P and Q are unitary matrixes of 2N*1, C1 and C2 are positive definite matrixes of 1*1, U is a subspace composed by column vectors of P, and V is a subspace composed of column vectors of Q; (5) the affine projection that the conjugate of the y1 and the y2 is projected onto the U along the V is obtained; (6) PH is multiplied with the affine projection; (7) information of a first user is obtained through maximum likelihood decoding. The decoding method has the advantages that dimensionality of space is increased through the vector quantity superposition, and accordingly orthogonality of the space is intensified.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to the technical field of multi-antenna wireless communication, in particular to an application of Alamouti code based on vector superposition combined with an affine projection method in a downlink multi-user MIMO system. Background technique [0002] With the rapid development of wireless communication and the increasing transmission rate, multi-antenna technology can effectively improve the stability of transmission and increase the spectrum efficiency, and will become one of the key technologies of the next generation of wireless communication. The main task of the space-time code is to design a codebook to coordinate multiple antennas, and to transmit different signals at different times at different antennas, so that the entire system has the best performance. With the gradual and widespread application of multi-antenna technology, space-time codes will attract ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/04H04B7/08
Inventor 王海泉马路平侯林林陈瑞明陈勰
Owner HANGZHOU DIANZI UNIV