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Downlink precoding method, device and base station

A precoding and algorithmic technology, applied in the direction of radio transmission system, advanced technology, electrical components, etc., can solve problems such as multiple iterations

Active Publication Date: 2021-12-03
HUAWEI TECH CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] This application provides a downlink precoding method, device and base station to solve the problem that traditional precoding methods need to perform multiple iterations

Method used

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  • Downlink precoding method, device and base station
  • Downlink precoding method, device and base station
  • Downlink precoding method, device and base station

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Embodiment approach

[0098] Based on this, in order to achieve the effect of maximizing channel capacity, a schematic implementation of the method for solving the optimal weight value in this application is as follows:

[0099] S301: Setting an objective function.

[0100] In order to obtain the effect of maximizing the channel capacity, the function corresponding to the channel capacity can be set as the objective function, and iteratively solved to obtain the corresponding power weight when the channel capacity is maximized.

[0101] For example, take the maximum value of mutual information:

[0102]

[0103] Since, the maximum channel capacity is:

[0104]

[0105] Therefore, as long as the Shannon formula is maximized, the channel capacity can be maximized, namely:

[0106]

[0107] Among them, h(Y) is the entropy information of the output signal Y, h(Y|X) is the conditional entropy information of the output signal Y under the condition that the input signal is X, P Y is the varian...

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Abstract

The embodiment of the invention provides a downlink precoding method, a downlink precoding device and a base station. According to the downlink precoding method, after channel information of a downlink channel is obtained, a power allocation weight of the downlink channel is iteratively generated by using an MIMA algorithm, a target function of the MIMA algorithm is a mutual information lower bound function of the downlink channel, and initialization parameters of the MIMA algorithm are an initial weight and a channel feature matrix in the channel information; and performing precoding on the downlink data according to the power allocation weight to realize transmission of the downlink data. According to the downlink pre-coding method, a mutual information lower bound function is used as a target function, calculation of power and weight is completed through iteration so as to determine an optimal constellation combination, and under the condition of a small number of iterations, it is guaranteed that channel capacity allocation is maintained in a globally optimal solution when a discrete modulation constellation is conducted.

Description

technical field [0001] The present application relates to the technical field of digital communication, and in particular to a downlink precoding method, device and base station. Background technique [0002] Precoding is a signal processing link of digital communication, which is to pre-process the transmitted signal at the sending end when the channel state information is known. The precoding stage can be used to transmit multiple data streams in parallel through multiple transmit antennas to increase the peak transmission rate. In a multiple input multiple output (MIMO) scenario, if the number of antennas and antenna size remain unchanged, the performance of signal transmission in the scenario will be constrained, so that single user (single user, SU) and multiple user (multiple user, MU ) is limited in capacity. [0003] In order to improve signal transmission performance, the transmission power of each channel can be allocated by adjusting the downlink weight in the p...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/0426
CPCH04B7/0456H04B7/0426Y02D30/70
Inventor 郭森宝李桂宝乐春晖
Owner HUAWEI TECH CO LTD
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