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Decoding method of cyclic space-time code based on affine projection

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

Active Publication Date: 2013-05-15
镇江平安科技服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Decoding method of cyclic space-time code based on affine projection
  • Decoding method of cyclic space-time code based on affine projection
  • Decoding method of cyclic space-time code based on affine projection

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Embodiment 1

[0048] It is assumed that the system has M=3 transmitting antennas, K=3 users, and each user has N=3 receiving antennas, and the transmission time interval is T=3. The constellation uses 4-QAM, the total energy is 4 and the transmission rate is 6-bit pcu. The system model is send signal matrix X = x 1 x 2 x 3 x 3 x 1 x 2 x 2 x ...

Embodiment 2

[0070] It is assumed that the system has M=2 transmitting antennas, K=2 users, and each user has N=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 x 2 x 1 , 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

[0071] y 1 ...

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Abstract

The invention discloses a decoding method of a cyclic space-time code based on affine projection in a downlink multi-user multi-input multi-output system which comprises a first step of decomposing a channel matrix into a formula described in the specification, performing polar decomposition on two symbols described in the specification and obtaining a formula 2described in the specification, wherein P (Q) is unitary matrix of the NM*1 (NM*(M-1)), a C1 (C2) is a positive definite matrix of 1*1 ((M-1)* (M-1)), defining a U to be a subspace formed by column vectors of the P, wherein the V is a subspace formed by column vectors of the Q, a second step of projecting a matrix described in the specification on the U along the V and obtaining an affine projection of the matrix, wherein the affine projection is a formula 3 described in the specification, substituting the matrix to the formula 3, carrying out simplification and obtaining formula 4 described in the specification, wherein another symbol is equal to a formula 6, a third step of using a P<H> for multiplying the formula 4 to obtain a formula 5 described in the specification, a fourth step of obtaining information of a first user through maximum likelihood decoding. The decoding method of the cyclic space-time code based on the affine projection has the advantages that under the condition that a sending end doesn't know channel status information, an affine projection method is used and interference information among multiple users in a downlink multi-user multiple input multiple output system can be removed, through the utilization of the cyclic time-space code, information of each user is enabled to pass through all information channels, and therefore spatial diversity is ensured, and information of sending signals of a sending end is recovered accurately.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to the technical field of multi-antennas, and in particular applies a cyclic space-time code to a downlink multi-user multiple-input multiple-output system by means of an affine projection method, that is, a downlink multi-user multiple-input multiple-output system A decoding method for cyclic space-time codes based on affine projection. 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 degradation of the bit error rate (BER) performance of the receiver. Diversity techniques are widely used in wireless mobile communications to reduce the effects of multipath fading and improve transmission reliability without increasing transmit power or sacrificing communication...

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勰陈瑞明
Owner 镇江平安科技服务有限公司
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