分布式阵列系统中反馈比特的分配方法

doi:10.11959/j.issn.1000-0801.2020300

摘要/Abstract

摘要：

在采用频分双工的通信系统中，基站通常需要用户反馈信道状态信息以进行预编码。对于分布式阵列系统，由于多个接入节点布置在小区的不同位置，用户与小区内不同接入节点之间的信道条件不同。当用于反馈信道状态信息的资源受限时，需要对反馈比特的分配方法进行优化，从而提高系统的整体性能。在多用户分布式阵列系统中，采用基于距离阈值的接入节点选择方法，并在此基础上结合随机矢量量化码本的量化特性以及泰勒展开法，对系统量化容量损失进行推导，并给出了近似表达式。基于该表达式，提出了反馈比特分配方法，与其他的分配方法相比，不限制用户选择的接入节点数目使本文的方法更加具有普遍性。仿真结果显示，在反馈资源有限的情况下，提出的策略优于传统的等比特分配方案，可以获得较好的性能。

关键词: 分布式阵列, 有限反馈, 多用户, 比特分配, 预编码

Abstract:

In a frequency division duplex communication system,precoding at the base station usually requires terminal feedback channel state information.In a distributed array system,the channel conditions between the terminal and different access nodes in the cell are different because multiple access nodes are arranged at different locations in the cell.When the resources for feedback channel state information are limited,the allocation method of feedback bit needs to be optimized to improve the overall performance of the system.In a multi-user distributed array system,an access node selection method based on distance threshold was adopted.Based on this method,the quantization characteristics of the random vector quantization codebook and the Taylor expansion method were used to derive the system quantization capacity loss,and then an approximate expression was given.Based on this expression,a feedback bit allocation method was proposed.Compared with other allocation methods,the method of this paper was more universal because it did not limit the number of access nodes selected by the user.The simulation results show that the strategy proposed is superior to the traditional equal-bit allocation scheme and can obtain better performance when the feedback resources are limited.

Key words: distributed antenna array, limited feedback, multi-user, bit allocation, precoding

中图分类号:

TN92

张帅,潘鹏,王璀. 分布式阵列系统中反馈比特的分配方法[J]. 电信科学, 2020, 36(11): 79-88.

Shuai ZHANG,Peng PAN,Cui WANG. Feedback bit allocation in distributed antenna array systems[J]. Telecommunications Science, 2020, 36(11): 79-88.

图/表 4

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