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Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system

A technology of precoding matrix and precoding vector, applied in diversity/multi-antenna system, error prevention/detection using return channel, error prevention/detection through diversity reception, etc., can solve the problem of reducing system performance and not considering retransmission data and other issues to achieve the effect of increasing throughput, increasing link peak rate or cell capacity, and increasing the probability of pairing

Inactive Publication Date: 2009-10-14
NTT DOCOMO INC
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for selecting a precoding matrix / vector in a multiple-input multiple-output system, which solves the problem that in the prior art, when the user feeds back the antenna index information, retransmission data is not considered, which leads to a certain degree of reduced system performance technical issues

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  • Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system
  • Method and device for selecting pre-coding matrix/vector in multi-input and multi-output system

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[0045] In order to make the object, technical solution 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.

[0046] The present invention mainly provides a method for selecting an effective vector index in a MIMO precoding system, and the method can further improve the throughput of the system after considering whether the user retransmits or not.

[0047] The present invention is divided into two cases according to the number of users of the MIMO precoding system, one is a single user case, and the other is a multi-user case, and the two cases will be described in detail below.

[0048] 1. Single user situation.

[0049] The application of the present invention in the downlink single-user MIMO system is a retransmission-based PMI (Preferredmatrix Index preferred matrix index) selection method.

[0050] For a single-user MIMO system, all antennas transmit...

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Abstract

The invention provides a method and a device for pre-coding matrix / vector in a multi-input and multi-output system. The method comprises the steps as follows: a data receiving terminal selects the pre-coding matrix index or the pre-coding vector index of a user by judging whether every data stream of the user transferred is retransmission data stream or not. After the condition that the user retransmission is needed or not is considered, pre-coding index information fed back by the user in a multi-input and multi-output pre-coding system is selected, thereby the throughput of the system is further enhanced.

Description

technical field [0001] The invention relates to a scheduling method for effectively improving link peak rate or cell capacity in a MIMO precoding system, in particular to a method and device for selecting a precoding matrix / vector in a MIMO system. Background technique [0002] Over the past few years, wireless services have become increasingly important, while the need for higher network capacity and higher performance continues to grow. Several options such as higher bandwidth, optimized modulation and even code multiplexing systems have limited potential to improve spectral efficiency, and the focus of development has been placed on MIMO (Multiple Input Multiple Output, or "Multiple Input Multiple Output") systems , which utilizes spatial multiplexing techniques to improve the efficiency of the used bandwidth by employing antenna arrays. [0003] MIMO requires precoding before the antenna array transmits data streams. MIMO precoding technology can effectively improve lin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/02H04L1/18H04B7/04
Inventor 刘芳佘小明陈岚
Owner NTT DOCOMO INC
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