WPAN/WLAN应用环境下的一类混合链路自适应算法

钱小勇; 沈连丰; 胡静; 许国军; 徐平平

WPAN/WLAN应用环境下的一类混合链路自适应算法

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出版历程
- 收稿日期: 2001-11-05
- 修回日期: 2002-06-20
- 刊出日期: 2003-04-19

Hybrid link adaptive algorithms for wpan/wlan applications

摘要

摘要: 该文分析了基于包错误率(PER)测量及基于我干比(C/I)估计的链路自适应算法的优缺点,在此基础上提出了两种WPAN/WLAN应用环境下的混合算法,即同时考虑PER与C/I的混合算法和选择性考虑PER与C/I的混合算法,并对它们进行了理论分析和数值仿真。结果表明,在理想的单用户接入情况下,同时考虑PER与C/I的混合算法的吞吐量要大于其它算法。在实际的多用户接入情况下,分配给每个用户的资源相对较少,此时,选择性考虑PER与C/I的混合算法能够减小接收包数目较少或C/I估计误差大大以及信道误判等因素造成的吞吐量损失,达到比其它算法更大的网络吞吐量。
- 无线个域网; 无线局域网; 高性能无线局域网; 载干比; 包错误率; 链路自适应
Abstract: In this paper, the characteristics of two link adaptive algorithms based on Carrier to Interference ratio (C/I) and Packet Error Rate (PER) are discussed. Furthermore, two hybrid algorithms of link adaptation are proposed on the analysis of the existing algorithms. One is named integrated hybrid method, in which PER and C/I are taken as the estimates of channel quality simultaneously. The other that selectively considers C/I or PER as the estimates of channel quality at a time is called selective hybrid method. Simulation results indicate that the integrated hybrid method can achieve the maximum throughputs at an ideal uni-user scenario. While at a multi-user scenario, a few received packets of one user lead to the large variance of PER values, which results in throughput loss. Therefore, at the scenario above, selective hybrid method is superior to other methods in term of network throughputs.

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