对协作系统自适应角色选择策略的思考

[摘要] 在传统协作系统基础上提出了一种新颖的自适应协作方式——机会角色选择协作。为进一步说明该策略，构建了一种最基本的两用户机会协作框架，其中两个用户相互竞争将各自信息发送给同一目的端。根据瞬时信道条件，两用户均可以机会地充当信息源角色，而另一用户将作为放大转发中继来为信源服务。同时，在此基础上提出并简要描述了一种最优的中心化角色选择策略(C-ROSE)。该策略能够最大化目的端接收信噪比(SNR)，进而提高系统传输性能。研究表明，通过这种动态、灵活、高效的节点角色分配方式，协作系统的传输可靠性可得到进一步增强，从而为构建稳固、高效、互惠的协作传输体系开辟了新道路。

[关键词] 协作通信；中断概率；角色选择

[Abstract] This paper describes an adaptive cooperative technique and opportunistic role-selection scheme based on a traditional cooperative scheme. We create an opportunistic cooperative framework where two users compete to transmit their own information to a common destination. Depending on the instantaneous channel conditions, either of the users can be the information source and the other user is an amplify-and-forward relay. To reduce the likelihood of system outages, an optimal centralized role selection scheme called C-ROSE is proposed. This scheme maximizes the received signal-to-noise ratio at the destination. Our dynamic, flexible role-selection scheme can ameliorate transmission reliability in order to create an effective cooperative communication system.

[Keywords] cooperative communications; outage probability; role selection