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Precoding method and device for multi-user MIMO system

A multi-input, multi-output technology, applied in the field of communication, can solve the problem that the number of base station transmitting antennas cannot be small.

Active Publication Date: 2016-12-14
HUAWEI TECH CO LTD
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  • Description
  • Claims
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Problems solved by technology

[0015] However, the precoding method of this MIMO system in the prior art has a constraint: for user i, the number of transmitting antennas of the base station cannot be less than the sum of the receiving antennas of all other users
This is a big limitation for practical multi-user MIMO systems

Method used

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Embodiment Construction

[0079] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0080] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0081] figure 1 It is a flow chart of Embodiment 1 of the precoding method of the multi-user MIMO system of the present invention. Such as figure 1 As shown, the method may include:

[0082] Step S101: Obtain c...

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Abstract

The invention discloses a pre-coding method for a multi-user multi-input multi-output system and an apparatus thereof. The method comprises the steps of acquiring channel gains of a plurality of user terminals; initializing an autocorrelation matrix of receiving weights of each user terminal; calculating a pre-coding vector of each user terminal based on channel gain matrixes and the autocorrelation matrixes; calculating updated autocorrelation matrixes based on the pre-coding vectors; calculating a updated pre-coding vector of each user terminal; executing the steps of calculating the updated autocorrelation matrixes and calculating the updated pre-coding vector of each user terminal in a cyclic manner; and adjusting power and phase of a signal transmitted to each user terminal based on the calculated pre-coding vectors of each user terminal by a preset number of times. The method or the apparatus can be used for removing the limitation that the number of antennas transmitted by the base station must not be less than the total number of antennas received by all the other users thereby reducing a bit error rate of the system.

Description

technical field [0001] The invention relates to the communication field, in particular to a precoding method and device for a multi-user MIMO system. Background technique [0002] A multi-user multiple input multiple output (Multi-User Multiple Input Multiple Output, MU-MIMO) system broadcast channel refers to a downlink in which both a sender (such as a base station) and a receiver (such as a mobile station) are equipped with multiple antennas. In the MU-MIMO system, co-channel interference exists because multiple user signals are transmitted and received at the same time. In the prior art, the problem of co-channel interference is mainly solved by precoding the output signal of the sender. [0003] figure 1 It is a schematic structural diagram of a MIMO system in a downlink single-cell multi-user environment. Such as figure 1 As shown, the base station communicates with K users simultaneously. Both the base station and the user adopt multi-antenna configuration, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 林华炯张忠培王营
Owner HUAWEI TECH CO LTD
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