摘要
中继协作传输能有效克服信道衰落影响,提高分集效果。为了提高全天候协作系统的频谱效率,在选择解码转发协议的前提下,研究了基于门限决策的中继选择策略,分析了其性能,并推导了高信噪比下的中断概率和频谱效率的近似表达式。仿真表明,在低信噪比和较少中继的场景中,不同门限下的中断概率十分接近,如果协作门限增加0.09,系统频谱效率可提高0.12;在高信噪比和较多中继的场景中,不同门限下的频谱效率较为接近,当系统中断概率为10^(-2)时,如果协作门限减少0.9,可获得约1.1 dB的信噪比增益。
Cooperative transmission can effectively overcome performance degradation caused by channel fading and thus improve diversity effect. In order to improve the spectral efficiency of all-time cooperative, relay selection strategy with selective decode-and-forward protocol based on threshold decision was mainly investigated. The performance was also analysed and the approximate expression of the outage probability and the spectrum efficiency with high signal-to-noise（SNR） were derived. Simulation results show that under low-SNR and few relays circulations, the outage probability under different thresholds are very close. If the collaboration threshold increases by 0.09, the spectral efficiency improves by 0.12. Under high-SNR and many relays circulations, the spectral efficiency under different thresholds are similar. When the system outage probability is 10.2, the collaboration threshold decreases by 0.9 and 1.1 dB SNR gain can be obtained.
出处
《电信科学》
北大核心
2016年第1期18-24,共7页
Telecommunications Science
基金
浙江省自然科学基金资助项目(No.LZ14F010003)
国家自然科学基金资助项目(No.61471152)
东南大学移动通信国家重点实验室开放研究基金资助项目(No.2014D02)~~
关键词
选择解码转发
中继选择
门限决策
中断概率
频谱效率
selective decode-and-forward； relay selection； threshold decision； outage probability； spectrum efficiency
