Pre-coding method and device

A precoding and transmit precoding technology, applied in the field of THP technology, can solve the problem that the number of receiving users cannot exceed the number of transmitting antennas and cannot be solved.

Active Publication Date: 2010-10-27
HUAWEI TECH CO LTD
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Problems solved by technology

[0007] The inventors have found that at least the following problems exist in the above prior art: In MIMO Broadcast Downlink (multiple input multiple output downlink broadcasting), and each user receives a single stream, since THP is limited by the channel space, the number of receiving users cannot exceed The number of transmitting antennas

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Embodiment Construction

[0026] Embodiment 1 of the present invention provides a precoding method. In this embodiment and the following embodiments, description is made by taking the transmitting end provided with two transmitting antennas as an example.

[0027] In the MIMO system of this embodiment, the transmitting end is provided with two antennas, that is, the number of transmitting antennas N t is 2, the transmitting end can know all the channel state information; the number of users K in the MIMO system is 2, and the number of receiving antennas of the users is N r Unlimited and N r Can be greater than 2, each user corresponds to a data flow. In the above case, the flow of the method is as attached figure 2 shown.

[0028] figure 2 In S200, a transmitting end such as a base station obtains channel information from two transmitting antennas to two users respectively, and obtains a channel correlation matrix according to the channel information.

[0029] If the channel information obtaine...

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Abstract

The invention discloses a pre-coding method and a pre-coding device. The pre-coding method comprises that: a transmitting end acquires channel information of a plurality of antennas to two users respectively, and acquires channel related matrixes according to the channel information; the transmitting end acquires generalized characteristic vectors of the channel related matrixes; the transmittingend determines transmitting pre-coding vectors of the two users according to the generalized characteristic vectors, acquires receiving vectors of the two users according to the transmitting pre-coding vectors, and acquires equivalent channel matrixes corresponding to the two users according to the receiving vectors and the channel information respectively; and the transmitting end acquires powerscaling matrixes, feedback matrixes and feed-forward matrixes corresponding to the two users according to the equivalent channel matrixes respectively, and performing THP on the two users according to the receiving vectors, the power scaling matrixes, the feedback matrixes and the feed-forward matrixes. According to the technical scheme, the number of the antennas collocated by the two users cannot be limited.

Description

technical field [0001] The present invention relates to the technical field of network communication, in particular to THP technology in a Multi-Input-Multi-Output (MIMO) system. Background technique [0002] Under MIMO Broadcast Channel, Dirty Paper Coding (Dirty Paper Coding, DPC) is an optimized technical solution. Tomplinson Harashima Precoding (THP) can not only implement the DPC technical solution, but also the THP technology has the characteristics of simple implementation and good performance. [0003] The system model of THP is attached figure 1 shown. [0004] figure 1 The relationship between the transceivers of the system model in can be expressed as: y=GHFB -1 v+Gn, where G is the power scaling matrix, H is the channel information from the transmitting antenna of the transmitting end to the user, F is the feedforward matrix, B is the feedback matrix, v is the transmitting signal vector, and n is the channel information on the receiving antenna of the user n...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/02H04B7/00H03M7/00
Inventor 袁超伟李斌罗毅沈晖
Owner HUAWEI TECH CO LTD
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