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A kind of multi-user precoding method and device

A multi-user, precoding matrix technology, applied in the field of precoding, can solve problems such as poor user data stream effect and limited number of antennas at the transceiver end

Active Publication Date: 2011-11-30
ZTE CORP
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Problems solved by technology

[0004] The present invention provides a multi-user precoding method to overcome the problems in the prior art that the effect of eliminating interference between user data streams is poor and the number of antennas at the transceiver end is limited

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  • A kind of multi-user precoding method and device
  • A kind of multi-user precoding method and device

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Embodiment Construction

[0020] The signal-to-noise ratio estimation method and device proposed by the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0021] Assume that the communication system consists of an evolved base station eNB and K mobile users UE 1 , UE 2 ,…,UE K Composition, K is an integer greater than or equal to 1, and each user uses the same time-frequency resource, the evolved base station eNB has M transmit antennas, and the kth (k=1, 2, 3, ..., K) user includes N k root receiving antenna, user UE K The number of data transmission layers is m k (Need to transfer m k independent data streams), m k is an integer greater than or equal to 1. Then the evolved base station eNB sends user UE K The transmitted signal can be expressed as an M-dimensional column vector W k the s k , where M is an integer greater than or equal to 1, W k For user UE K M×m k Dimensional precoding matrix, and satisfy Among them, ...

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Abstract

The invention discloses a method for determining multi-user precoding information, which includes the following steps: estimating the channel matrix Hk between the base station and the user UEk; according to the maximum signal-to-leakage-noise ratio criterion, repeatedly performing the following iterative process until two adjacent iterations are obtained The error between precoding matrices is less than the predetermined threshold: use Hk and the decoding matrix obtained in the previous iteration to obtain the current precoding matrix; use the precoding matrix obtained in this iteration to obtain the current decoding matrix; use the last iteration The obtained precoding matrix and decoding matrix are respectively used when the base station precodes the signal sent to the user UEk, and when the user UEk decodes the data. The present invention adopts the criterion of maximum signal-leakage-to-noise ratio and an iterative method to obtain the precoding matrix and decoding matrix used by the base station and users, thereby eliminating interference between users to a greater extent and making the number of antennas at the receiving and receiving ends unlimited.

Description

technical field [0001] The present invention relates to the technical field of precoding in an LTE-A (Long Term Evolution Advanced, long-term evolution upgrade) system, and in particular to a multi-user precoding method and device. Background technique [0002] In the LTE-A system, when the downlink closed-loop transmit antennas are 2 antennas and 4 antennas, the closed-loop feedback mainly adopts the form of feedback PMI (Precoding Metrix Indicator, precoding matrix indicator), that is, the user receiving end selects one of the precoding books precoding matrix, and then return its corresponding PMI to the evolved base station (eNodeB). In the MU-MIMO (Multiple User Multiple Input Multiple Output) mode, data streams of multiple users are transmitted on the same physical resource to achieve spatial multiplexing. In order to eliminate the interference between multiple user data streams, the base station selects users whose precoding matrix can be approximately pairwise orthog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 王衍文刘文豪
Owner ZTE CORP
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