无线网络中分布式机会协作的信道接入算法研究  

Research on Channel Access Algorithm for Distributed Opportunistic Collaboration in Wireless Networks

作　　者：陈倩 骆骏 乐婷婷 CHEN Qian;LUO Jun;LE Tingting(School of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650500

出　　处：《电子科技》2018年第11期6-10,共5页Electronic Science and Technology

基　　金：国家自然科学基金(61262040)

摘　　要：在分布式无线网络中,随着高速数据传输的需要与发展,通过一个快速准确的信道接入方式来合理利用现有频谱资源已成为目前的研究热点。文中提出了一种基于竞争的具有解码转发中继的分布式机会信道接入算法(DOCA)。该算法分别提出了第二跳和第一跳的最优信道接入策略,即采用请求发送RTS和清除发送CTS的握手方式进行信道争用,并判断源节点是否获胜。如果源节点获胜,则估计第一跳信道中的信道状态信息,并且确定胜者源是放弃还是继续;若放弃,则让所有源开始新的争用;若继续,则由中继进行第二跳信道的一系列探测。最后,对比DF-CA算法和NCA算法,仿真结果表明,当第二跳信道具有较大的平均信噪比时,DOCA算法在吞吐量和数据包延迟方面都有性能提升。In distributed wireless networks, with the demand and development of high - speed data transmission, a rational use of existing spectrum resources through a last and accurate channel access has become a hot research topic. To this end, this paper proposed a contention - based distributed opportunistic channel access algorithm （DOCA） with decoding and forwarding relays. The algorithm respectively proposed the optimal channel access strategies for the second hop and the first hop that the channel contention was determined by requesting to send RTS and clearing the handshake to send CTS and whether the source node won or not was judged. If the source node won, the channel state information in the first hop channel was estimated, and whether the source of the winner was abandoned or continued was determined. If the winner source was abandoned, all sources started a new contention. If the winner source was continued, the relay would performed a series of probes for the second hop channel. Finally, compared with DF - CA algorithm and NCA algorithm, the simulation results showed that when the second hop channel had a large average signal -to -noise ratio, the perftormance of DOCA algorithm in throughput and data packet delay were significantly improved.

关 键 词：无线网络 机会性传输 最优停止 信道接入 DOCA 

分 类 号：TN929.5[电子电信—通信与信息系统]