A Compared Performance Analysis Between  CDMA Random Access System and S  ALOHA System

Xu Dayong; Xiang Haige

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A Compared Performance Analysis Between CDMA Random Access System and S ALOHA System

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- A Compared Performance Analysis Between CDMA Random Access System and S ALOHA System
- Acta Electronica Sinica Issue 1, (1999)
- 作者机构：
  
  北京大学电子学系
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN914.5
- Published：1999
- 稿件说明：
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[1]徐大勇,项海格.CDMA随机接入系统与S-ALOHA系统的性能对比分析[J].电子学报,1999(01):134-136.

Xu Dayong, Xiang Haige. A Compared Performance Analysis Between CDMA Random Access System and S ALOHA System[J]. Acta Electronica Sinica, 1999, (1).
[1]徐大勇,项海格.CDMA随机接入系统与S-ALOHA系统的性能对比分析[J].电子学报,1999(01):134-136. DOI：

Xu Dayong, Xiang Haige. A Compared Performance Analysis Between CDMA Random Access System and S ALOHA System[J]. Acta Electronica Sinica, 1999, (1). DOI：

摘要

传统的ＳＡＬＯＨＡ随机接入协议用于通信网络，其理论上的极限通过量为３６％，但在这种情况下，系统的时延随着负荷的增加也变得越来越大，因此传统ＳＡＬＯＨＡ方式不适合于时延要求较高的通信系统．本文通过研究系统在较低负荷的情况，发现采用ＣＤＭＡ技术的随机接入方式在占用相同的系统带宽的条件下，可以获得与传统ＳＡＬＯＨＡ方式相同的通过量，而时延却大大降低，而且随着ＣＤＭＡ领域抗干扰技术的发展，它的系统性能还可以进一步提高．本文在理论分析的基础上给出了一些数值结果．

Abstract

The theoretical throughput of the S ALOHA system is 36%

but meanwhile there’s a large average delay in the system due to frequent retransmission.So it does not fit for the condition that needs real time services.The paper finds that a random access system based on CDMA techniques can achieve the same throughput as ALOHA system

while has a reduced average delay.And with some anti inference methods of CDMA technique

the system performance can be improved.Some numerical results are given.

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