无线通信系统中时频域联合的机会频谱接入算法

Joint Time-frequency Opportunistic Spectral Access Algorithm for Wireless Communication Systems

该文讨论一个多信道的无线通信系统,信道建模为慢衰落瑞利信道。根据信道信噪比,将信道质量划分多个状态,每个状态对应一个最大传输速率。此类系统中,发送节点一般已知信道状态的部分信息,并可以通过逐信道探测的方法获取实时的信道状态信息(Channel State Information,CSI)。而探测过程会消耗可以用于真正数据包(DATA)的时间。通过分析基于最优停止时间理论的机会频谱接入算法的局限性,该文提出了时频域联合的机会频谱接入算法,仿真分析证明在不同条件下本算法性能优越。

A multichannel wireless communication system is discussed in this paper,and the channels are modeled as slow fading Raylelgh channel.Channel quality is divided into several state,and each state corresponding to a maximum transmission rate.The senders usually have partial information about the channel state,and can get more real time Channel state information （CSl） through channel probing.But channel probing will consume time which could transmit true DATA packet.To deal with the limitation of the opportunistic spectral access algorithm based on optimal stopping time theory,we propose a joint time-frequency opportunistic access algorithm.Simulations and analysis show that the algorithm gets better performance.