可变随机域宽度的多用户机会频谱接入方案

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.

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

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 was proposed. By adopting randomized sensing policy which can weaken user-synchronization, while 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 user-synchronization avoidance. Simulations show that the policy can achieve higher network throughput compared to the randomized sensing policy over the whole channels.