Downlink signal preprocessing transmission method and device

A transmission method and preprocessing technology, applied in the field of communication, to achieve the effects of improving spectral efficiency, increasing effective coverage and reducing interference

Inactive Publication Date: 2012-08-22
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention provides a downlink signal preprocessing sending method and device to finally solve the problem of reducing co-channel interference in the system transmission process by at least solving the problem of related combination in multi-point transmission technology

Method used

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  • Downlink signal preprocessing transmission method and device
  • Downlink signal preprocessing transmission method and device
  • Downlink signal preprocessing transmission method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0054] In a distributed precoding system, there are N cooperative base stations, they transmit data for K users at the same time, and the number of transmitted data streams is d k . For each user k, k=1,...,K, each coordinated base station i, i=1,...,N respectively performs the following operations to obtain the distributed precoding matrix corresponding to the user k served by it, and use the precoding matrix The encoding matrix preprocesses the sent data and then sends it out.

[0055] (1) The sender i obtains the channel coefficient matrix H between it and the user i ,in is a matrix of complex coefficients, N R Indicates the number of receiving antennas of the user, Indicates the number of transmitting antennas of the transmitting end i.

[0056] (2) The sender i uses the channel coefficient matrix H i Get the optimal precoding matrix W i ,in, is a matrix of complex coefficients, N R Indicates the number of receiving antennas of the user, d i Indicates the numb...

Embodiment 2

[0069] In a distributed precoding system, there are 2 cooperative base stations, they transmit data for K users at the same time, and the number of data streams to be transmitted is d k =2. For each user k, k=1,...,K, each coordinated base station i, i=1, 2 performs the following operations respectively to obtain the distributed precoding matrix corresponding to the user k served by it, and use the precoding matrix Preprocess the sent data and send it out.

[0070] (1) The sender i obtains the channel coefficient matrix H between it and the user i ,in is a matrix of complex coefficients, N R Indicates the number of receiving antennas of the user, Indicates the number of transmitting antennas of the transmitting end i.

[0071] (2) The sender i uses the channel coefficient matrix H i Get the optimal precoding matrix W i ,in, is a matrix of complex coefficients, N R Indicates the number of receiving antennas of the user, d i Indicates the number of data streams sent...

Embodiment 3

[0079] In a distributed precoding system, there are 2 cooperative base stations, they transmit data for K users at the same time, and the number of data streams to be transmitted is d k =2. For each user k, k=1,...,K, each coordinated base station i, i=1, 2 performs the following operations respectively to obtain the distributed precoding matrix corresponding to the user k served by it, and use the precoding matrix Preprocess the sent data and send it out.

[0080] (1) The sender i obtains the channel coefficient matrix H between it and the user i ,in is a matrix of complex coefficients, N R Indicates the number of receiving antennas of the user, Indicates the number of transmitting antennas of the transmitting end i.

[0081] (2) The sender i uses the channel coefficient matrix H i Get the optimal precoding matrix W i ,in, is a matrix of complex coefficients, N R Indicates the number of receiving antennas of the user, d i Indicates the number of data streams sent...

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Abstract

The invention discloses a downlink signal preprocessing transmission method and device. The downlink signal preprocessing transmission method comprises the following steps that: a transmission end i acquires a channel coefficient matrix Hi between the transmission end i and a user, wherein Hi belongs to C<NR*NTi>, and represents a complex coefficient matrix, NR represents a receiving antenna number of the user, and NTi represents a transmission antenna number of the transmission end i; the transmission end i acquires an optimal precoding matrix Wi by utilizing the channel coefficient matrix Hi, wherein Wi belongs to C<NR*di> and represents the complex coefficient matrix, and di represents a transmission data stream number of the transmission end I; and the transmission end i calculates a rotation matrix Ui of the transmission end by utilizing all acquired channel coefficient matrixes H1,..., the precoding matrixes W1,..., Wi, and the rotation matrixes U1,..., Ui-1 in mutually cooperative transmission ends, wherein the rotation matrix is U1 and is a unit matrix when i is equal to 1; the transmission end calculates a final precoding matrix W<new>i=WiUi according to the precoding matrix Wi and the rotation matrix Ui; and preprocessing the transmitted data, and transmitting the data through an antenna interface. The method and device disclosed by the invention have the advantages of reducing the interference of a cell edge, improving the frequency spectrum efficiency of the cell edge and increasing the effectively coverage range of a cell.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, to a downlink signal preprocessing and sending method and device. Background technique [0002] The traditional cellular network topology is a point-to-multipoint transmission mode in which one sender serves multiple users. For users at the edge of a cell, this transmission mode has greater inter-cell co-channel interference. The current method to solve the same-frequency interference between user cells at the edge of the cell can combine multiple sending ends, and the sending ends cooperate with each other to turn the interference signal into a useful signal. We call the problem of multiple adjacent transmitting ends (which can be base stations, relays, remote radio devices, etc.) and multiple user terminals communicating on the same time-frequency resource as multipoint transmission technology (such as figure 1 As shown), it includes Coordinated Multipoint Transmission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
CPCH04L25/03343H04B7/0417
Inventor 肖华华朱登魁宁迪浩鲁照华
Owner ZTE CORP
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