联合信道状态编码的基函数生成算法

A Function Generation Algorithm Based on Joint Channel Status Coding

针对远距离情况下基函数频谱失配导致的TDCS性能下降的问题,提出一种联合信道状态编码的远距离TDCS基函数生成算法。该算法通过对远距离收发两端的信道状态进行四进制合成编码,将联合信道划分为4种状态,根据频谱失配程度选择信道状态好的频点进行数据传输,并在解调前对接收信号进行滤波。理论分析表明,在相同情况下,使用联合信道状态编码机制的频谱利用率高于频谱交换机制的频谱利用率,从而有效避免收发两端放弃通信,更加接近TDCS的实际应用。仿真结果表明:该算法的抗干扰性能优于频谱交换机制,能够有效提高系统的频谱利用率,降低频谱失配对抗干扰性能的影响,扩展TDCS的应用范围。

Abstract： In view of the performance decline caused by spectrum mismatch in transform domain communi- cation system, a basic function generation algorithm based on joint channel status coding is proposed in this paper. The algorithm is used to conduct quarternary synthetic coding on the channel status of both trans- mitter and receiver, divide the joint channel into four states, choose good frequency points for data trans- mission according to the mismatch rate, and then implement filtering on the received signal before demodu- lation. Theoretical analysis implies that, in the same situation, the spectrum utilization rate of the joint channel status coding is higher than that of spectrum exchange mechanism, thus avoiding the transmitter and receiver to give up communication further close to the real situation. The simulation results show that the anti-interference performance of the algorithm is superior to that of spectrum exchange mechanism, and can effectively improve the spectrum utilization of the system, and reduce the impact of spectrum mismatch on interference performance, and expand the scope of application of TDCS.