Channel Capacity Comparison of Several Multiple Antennas Systems

WANG Yi; ZHAO Ming; ZHOU Shi-dong; YAO Yan

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Channel Capacity Comparison of Several Multiple Antennas Systems

更新时间：2025-07-16

- Channel Capacity Comparison of Several Multiple Antennas Systems
- Acta Electronica Sinica Vol. 30, Issue 6, Pages: 787-790(2002)
- 作者机构：
  
  清华大学微波与数字通信国家重点实验室,北京,100084
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN92
- Published：2002
- 稿件说明：
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WANG Yi, ZHAO Ming, ZHOU Shi-dong, et al. Channel Capacity Comparison of Several Multiple Antennas Systems[J]. Acta Electronica Sinica, 2002, 30(6): 787-790.
DOI：

WANG Yi, ZHAO Ming, ZHOU Shi-dong, et al. Channel Capacity Comparison of Several Multiple Antennas Systems[J]. Acta Electronica Sinica, 2002, 30(6): 787-790. DOI：

摘要

分布式天线、智能天线和扇区天线是三种能大大提高无线通信系统容量的技术

本文比较了这三种多天线系统的信道(Shannon)容量.假设每个用户在所有接收天线上的总功率相等

分析表明分布式天线和扇区天线的信道容量远大于智能天线的信道容量

而传统的观点认为智能天线在抑制干扰时要比扇区天线的性能更好

从而获得更大的系统容量.另外我们分析了分布式天线在渐近条件下的信道容量

即用户数

K和载波数M都趋近无穷大

而保证α=K/M一定.分析表明在α

较大时

分布式天线与比扇区天线的信道容量差趋近常数0.44比特/秒/维

但是如果考虑分布式天线的分集增益

那么分布式天线的信道容量要远大于扇区天线.

Abstract

Distributed antenna

smart antenna and sector antenna are three techniques to improve the system capacity in wireless communication.In this paper

we compare the channel/Shannon capacity of multiple antennas in the three cases.Assuming the average received signal power in total antennas from each user is the same

we get that distributed antenna and sector antenna have much larger Shannon capacity than smart antenna.This is in contrast with that smart antenna has a better performance than sector antenna in suppressing interference

which results in an improvement in system capacity.We also analyze the capacity of distributed antenna in unlimited case

that is

with large number of users

and large number antennas

while keeping the number of users per dimension

constant.Analysis show tha

t in case of large

1

the capacity of distributed antenna approaches to that of sector antenna with a constant addition 0.44bit/s/Hz/Dim.It should be noted that if diversity gain by distributed antenna is considered

its capacity is still much larger than that of sector antenna.

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