一种内部自适应的LDPC编码超宽带系统

Internally adaptive LDPC coded UWB impulse radio system

针对传统UWB-IR系统重复编码方法进行改进,提出了一种内部自适应的LDPC编码UWB-IR系统实现方案,即自适应选择LDPC码的码率和重复编码的数目。在AWGN信道进行了仿真和性能分析,并且与Turbo编码的UWB-IR系统进行了比较分析。理论分析和仿真结果表明,该系统在码长为512,比特速率为8.33 Mbps,误码率为10-4数量级时,性能优于Turbo编码的UWB-IR系统,并且复杂度较低。

Considering that traditional UWB IR system repeats and transmits very short pulses for each bit, an internally adaptive LDPC coded UWB-IR system to improve the repetition code was proposed.In the system LDPC code rate and the number of the repetition code are adaptively chosen. Simulation and performance analysis were conducted under AWGN channel. It is shown that the performance of the proposed system is greatly improved compared with that of the traditional UWB-IR system and at high code rate it is also better than that of Turbo coded UWB-IR system.