高码率LDPC与MSD技术在PCM/FM遥测体制下性能研究

Research on Performances of LDPC and MSD Techniques in PCM/FM Telemetry Community

PCM/FM作为遥测体制标准被广泛采纳,多符号检测(MSD)技术利用连续相位信号内在的记忆性,能从根本上去除传统的限幅鉴频器中产生的Click噪声,而低密度奇偶校验(LDPC)码是一种高效的信道编码技术。提出一种将这两项技术应用于PCM/FM遥测体制中的系统,并研究其性能。仿真结果表明,在误码率为10-4的条件下,采用MSD技术与码率为7/8的LDPC码,可以使系统获得大约4.2dB的编码增益。

PCM/FM is widely adopted as a standard by the telemetry community.The Multi Symbol Detection technique explores the inherent memory of continuous phase signals,It can essentially eliminate the click noise generated from the traditional limiter discriminator.The Low Density Parity Check Code is a channel coding technique with high performance.This paper proposes a PCM/FM telemetry system with LDPC and MSD techniques and investigates the performances.The simulation results show that with the MSD technique and 7/8 rate LDPC code,the system can obtain 4.2dB channel gain with bit error rate of 10-4.