可变随机域宽度的多用户机会频谱接入方案

Changeable-Domain Based Random Sensing Policy in Multi-User Opportunistic Spectrum Access

在分布式多用户频谱接入(OSA)环境下,从用户间信道选择同步问题成为干扰系统全网吞吐量的重要因素.为解决该问题,提出一种基于可变随机域宽度的多用户频谱接入方案,在充分利用随机化接入方式避免用户间同步的同时,通过改变可供随机接入选择的信道数(即随机域宽度),达到最优信道选择与同步避免的折中.仿真结果表明,相对于传统的全频段随机化接入同步避免方式,本方案可有效提升多用户机会频谱接入系统的全网吞吐量.

In distributed multi-user opportunistic spectrum access （OSA） environment, user-synchronization problem is the vital reason for network throughput deteriorating. To resolve this problem, a changeable-domain based sensing policy is proposed. By adopting randomized sensing policy it can weaken usersynchronization. When changing the number of channels which are available for randomized access （i. e. the width of the random domain）, the proposed policy can achieve a tradeoff between optimal myopic sensing and usersynchronization avoidance. Simulations show that the policy can achieve higher network throughput compared to the randomized sensing policy over the whole channels.