多径衰落信道中多OFC-SAW传感器同时读取算法

摘要

针对多个正交频率编码声表面波（OFC-SAW）传感器存在同时读取困难的问题，对理想信道中多OFC-SAW传感器反射信号进行了建模分析，通过理论推导实现了对理想信道中多OFC-SAW传感器信息的同时读取。针对实际应用中的多径衰落信道特点，建立了多径衰落信道中阅读器接收到的OFC-SAW传感器反射信号数学模型。对理想信道中阅读器接收到的信号与多传感器反射信号之间的关系模型进行修正，从而得到多径衰落信道中阅读器接收到的信号与多传感器反射信号之间的关系模型。实际应用中通过适时监测信道来估计信道模型参数，从而实现多径衰落信道中多OFC-SAW传感器信息的同时读取。最后经过仿真分析验证了该算法的有效性。%In order to solve the problem of simultaneous reading of multiple orthogonal frequency code surface acoustic wave(OFC-SAW)sensors,the signals reflected from multiple OFC-SAW sensors in ideal channel are ana⁃lyzed. The simultaneous reading of multiple OFC-SAW sensors in ideal channel is accomplished by theoretical deri⁃vation. According to the characteristic of multipath fading channel in practice,the mathematical model of a signal reflected from an OFC-SAW sensor in multipath fading channel is established. Then,the model of the relation be⁃tween signals received in reader and signals reflected from each OFC-SAW sensor in multipath fading channel is ob⁃tained by revising the relation model in ideal channel. The channels parameters are estimated by measuring chan⁃nels in time in practical application,and the simultaneous reading of multiple OFC-SAW sensors in multipath fad⁃ing channel is accomplished accordingly. Finally,the feasible is proved by simulation test.