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出 处:《科学技术与工程》2014年第8期274-277,共4页Science Technology and Engineering
摘 要:再入遥测信道是遥测过程中的一种特殊信道情况,当飞行器通过再入遥测信道时,黑障和多径效应会造成脉冲编码调制/调频(pulse code modulation/froquence modulation,PCM/FM)遥测信号信噪比降低和频率选择性衰落,甚至突破传统解调方法的解调门限,导致误码率大大增加。针对该问题,研究一种滑动长度为1的多符号检测(multi-symbol detection,MSD)解调算法:对连续观测到的N个码元信号与本地信号进行联合检测,但每次MSD判决较前一次MSD判决有N-1个码元的重合。理论上该算法可以将信道增益提高3 dB左右,仿真和测试结果验证了该算法的有效性。Reentry telemetry channel is a special channel in the process of remote sensing, when aircraft through the reentry telemetry channel, black barrier and multipath effect will cause the PCM/FM telemetry signal to noise ratio and frequency selective fading, even break through the demodulation threshold of traditional demodula- tion method, which led to the bit error rate is greatly increased. In view of this problem, a MSD ( Multi - Symbol Detection) demodulation algorithm with sliding length of 1 is researched : Continuous observations of N element sig- nal and local signal for joint detection, but each time the MSD sentences a MSD earlier with N - 1 element coinci- dence. In theory, the algor/thm can increase the channel gain about 3 dB. Simulation and test results verify the ef- fectiveness of the proposed algorithm.
关 键 词:PCM FM 多符号检测(MSD) 软解调
分 类 号:V556.4[航空宇航科学与技术—人机与环境工程]
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