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在一个多信道无线通信系统中,节点可以通过控制包的交互过程探测各无线信道,机会地利用拥有高传输效率的信道,而信道探测过程会消耗用于真正数据包传输的时间和能量。文中详细介绍了最优停止时间理论的基本原理,分析了该理论在慢衰落环境下的局限性,并通过引入有限状态马尔可夫信道模型,提出了一种时频二维的机会频谱接入算法。
In a multi-channel wireless communication system, nodes can detect each wireless channel by controlling the interaction of the packets, opportunistically utilize the channel with high transmission efficiency, and the channel sounding process consumes time and energy for the real data packet transmission. In this paper, the basic principle of optimal stop-time theory is introduced in detail. The limitation of this theory in slow-fading environment is analyzed. A finite-state Markov channel model is introduced to propose a two- algorithm.