频谱失配情况下TDCS性能分析及感知结果交换机制

在变换域通信系统(TDCS)中,通常假设收发两端频谱感知结果是一致的,若收发两端频谱感知结果不一致会使TDCS性能恶化。基于TDCS的基本原理,对收发两端频谱感知结果不一致(频谱失配)时的误码率性能进行了理论分析,推导并仿真验证了频谱失配情况下,理论误码率的表达式。为解决频谱失配对TDCS影响,提出了一种不需任何附加控制信道的TDCS收发两端交换频谱感知结果的机制。利用该方案,收发两端在交换各自的频谱感知结果后,利用双方频谱感知结果的交集进行通信,相当于收发两端处于同一频谱环境。最后,对该频谱感知结果交换方案进行了简单的理论分析。

TDCS Performance Analysis and Sensing Result Exchange Mechanism under Spectrum Mismatching

Generally,the spectrum sensing at both the transmitter and receiver is assumed to be same in transform domain communication system(TDCS),once the spectrum between transmitter and receiver mismatches,the performance of TDCS will be worse.Based on basic principle of TDCS,the performance of bit error rate(BER) is analyzed when the spectrum sensing result between transmitter and receiver is not identical.The formula of theoretical BER is derived and verified under spectrum mismatching.In order to solve the effect of spectrum mismatching,a spectrum sensing result exchange mechanism between transmitter and receiver in TDCS is proposed in this paper,and it needs not any additional control channels.Using this scheme,after each spectrum sensing result is exchanged between transmitter and receiver,the intersection of spectrum sensing results between transmitter and receiver is used to communicate.The transmitter and receiver locate in the same spectrum environment in this scheme.Finally,the simple theoretical analysis of this spectrum sensing exchange scheme is performed.