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本文以提高授权频段的频谱利用率和实现认知无线网络(CRNs)的连续数据传输为出发点,结合频谱空洞的时域和空域特性,定义了新的二维空时机会模型.在此基础上,进一步提出空时联合接入策略,以实现CRNs对授权频段的连续接入以及数据的连续传输.为了验证空时机会模型及空时联合接入策略的合理性和优势,考察了多跳CRNs在Nakagami-m衰落信道下的中断性能.其中,CRNs采用固定中继的多跳传输模式,并且应用了解码转发和选择分集合并策略.结合空时机会模型,推导出多跳CRNs的中断概率的闭式解析式.通过仿真比较和分析了空时联合接入策略与单纯的时域或空域接入策略的中断性能.结果表明,空时联合接入策略的平均网络中断概率更低.
In this paper, based on improving the spectral efficiency of licensed bands and realizing continuous data transmission of Cognitive Wireless Networks (CRNs), this paper defines a new two-dimensional space-time opportunity model based on the temporal and spatial characteristics of spectral holes , To further propose a space-time joint access strategy to achieve continuous access of CRNs to licensed bands and continuous data transmission.In order to verify the rationality and advantages of the space-time opportunity model and the space-time joint access strategy, multi-hop CRNs Interrupt performance in Nakagami-m fading channel, in which CRNs adopts fixed-hop multi-hop transmission mode and applies decoding and selective diversity combining strategy. Combining with space-time opportunistic model, the probability of interrupting multi-hop CRNs Closed-form analytic.Through the simulation, we compared and analyzed the performance of the space-time combined access strategy and the simple interruption of the time-domain or space-domain access strategy.The results show that the average network interruption probability of the space-time combined access strategy is lower.