摘要
为保证低信噪比条件下网络的接通率,在研究强干扰、低信噪比无线网络环境中扩频比分配机制的基础上,提出了一种基于自适应扩频技术的多址接入(ASMAC:Adaptive Spreading Multiple Access Control)协议。该协议提出了一种优化策略,能根据不同移动终端期望的传输速率和所处位置信噪比的不同,动态、自适应地分配扩频比。仿真结果表明,ASMAC协议能在信噪比为-12 dB的环境中提供平均8.6%的接通率。
Allocation mechanisms of spreading-spectrum rate in wireless networks with low signal-to-noise ratio due to strong interference are investigated for the purpose of ensuring relatively reliable communications. Based on DS-TDMA （Direct Spreading-Time Division Multiple Access） , a novel ASMAC （Adaptive Spreading Multiple Access Control） protocol, is present on the basis of adaptive frequency-spreading techniques, whose major innovation lies in that each mobile terminal is configured to piggyback its current SNR （Signal-to-Noise Ratio） and its expected traffic rate with its access request to the BS （Base Station）. Before the beginning of each frame, BS will consider the overall requirements from different mobile terminals and allocate sFreading-speetrum rate among them according to specially designed policy. Simulation results show that this algorithm is capable of providing an average connection rate of 8.6% even under an environment with - 12 dB SNR.
出处
《吉林大学学报（信息科学版）》
CAS
2009年第5期481-486,共6页
Journal of Jilin University（Information Science Edition）
基金
国家自然科学重大基金资助项目(60496316)
高等学校博士学科点专项科研基金资助项目(20050701007)
教育部科学技术研究重点基金资助项目(107103)
关键词
信噪比
扩频比
多址接入
signal-to-noise ratio （SNR）
spread-spectrum ratio
multiple access control （MAC）
