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Method and device for estimating rank indication and precoding matrix indication in precoding system

A technology of precoding matrix and rank indication, applied in the field of multiple-input multiple-output detection, can solve problems such as non-robustness, even-numbered multiple roots, and complexity, and achieve controllability and robustness, improve performance, and reduce algorithms effect of complexity

Inactive Publication Date: 2010-01-13
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0008] If the terminal estimates PMI and RI separately, the computational complexity is relatively large
By performing singular value decomposition (SVD) on the channel matrix H, the rank and right singular matrix of the spatial channel H can be obtained, but the traditional SVD algorithm is more complicated and not robust
The traditional QR decomposition algorithm of Jacobi rotation and Householder transformation is mainly for real symmetric matrices. For the complex channel matrix H in the communication system, it is necessary to convert the complex matrix N*N into a 2N*2N real matrix, which will lead to calculation iterations The amount of calculation is greatly increased, and the problem of even multiple roots will be introduced at the same time

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  • Method and device for estimating rank indication and precoding matrix indication in precoding system

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[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Reference figure 1 The method for estimating the rank indicator and the precoding matrix indicator in the precoding system of the embodiment of the present invention mainly includes the following steps:

[0052] Step 101: Calculate the autocorrelation matrix A of the channel matrix H: A=H H H;

[0053] Obviously, the matrix A is a complex conjugate symmetric (Hermitian) matrix. If the singular value decomposition of matrix H is: H = U∑ 1 V H , Then A=H H H=V(∑ 1 ) 2 V H It can be seen that the singular value decomposition of matrix H can be converted to the singular value decomposition of Hermitian matrix A. Among them, the right singular matrix after singular value decomposition of matrix A and matrix H are the same, and the singular values ​...

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Abstract

The invention provides a method and a device for estimating rank indication and precoding matrix indication in a precoding system. The method comprises the following steps: A. calculating a self-correlation matrix A of a channel matrix H: A=H<H>H; B. carrying out singular value decomposition on the matrix A: A=VsigmaV<H>, wherein V is a unitary matrix, and sigma is a diagonal matrix; C. confirming a rank of the matrix H according to a matrix sigma and generating rank indication according to the rank of the matrix H; D. confirming a precoding matrix according to the rank of the matrix H and a matrix V<H> and generating precoding matrix indication according to the precoding matrix. The invention can effectively reduce the complexity of an algorithm for estimating the rank indication and the recoding matrix indication by a terminal and improve the performance of the precoding system.

Description

Technical field [0001] The present invention relates to multiple input multiple output (MIMO) detection, and more particularly to a method and device for estimating rank indicator (RI) and precoding matrix indicator (PMI) in a pre-coding (Pre-coding) system. Background technique [0002] Precoding is a pre-processing of the signal when the channel state information (CSI) is known at the transmitter. Its main purpose is to reduce the system bit error rate or increase the system capacity. Precoding has received extensive attention both in Long Term Evolution (LTE) and in the 802.16 series of standards, and has been introduced into the MIMO system, becoming an important technical means to improve the performance of MIMO technology. The following takes LTE as an example for corresponding introduction. [0003] At the RAN1 meeting in Sophia-Antipolis, the system capacity reached by the downlink orthogonal frequency division multiplexing (OFDM) technology was agreed. Among them, the mai...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04B7/06H04L1/06
Inventor 邓冰
Owner ST ERICSSON SEMICON BEIJING
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