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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >PCM/FM aeronautical telemetry in frequency selective multipath interference
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PCM/FM aeronautical telemetry in frequency selective multipath interference

机译：频率选择性多径干扰中的PCM / FM航空遥测

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摘要

The performance of PCM/FM using a delay-line detector in multipath interference is analyzed. In aeronautical telemetry applications, the multipath interference causes a null in the signal spectrum which is web modeled by a channel composed of a line-of-sight signal and a strong specular reflection with magnitude /spl Gamma/ and excess delay less than a bit time. Analysis shows that the bit error probability is strongly dependent on the location of the null within the spectrum. The bit error probability averaged over the null location is also analyzed. For the case of no predetection filtering, the average bit error probability is dependent on the depth of the null but not on the width. The loss in performance (relative to the AWGN environment) is bounded by (1-/spl Gamma/)/sup -2/ which is the depth of the null. For the case of predetection filtering, the average bit error probability is dependent on both the width and depth of the null. The performance loss is bounded by (1-/spl Gamma/)/sup -2/spl Gamma// which is less than that for the case of no predetection filtering.
机译：分析了使用延迟线检测器的PCM / FM在多径干扰中的性能。在航空遥测应用中，多径干扰会导致信号频谱中的零点，该零点由一个由视线信号和强度为/ spl Gamma /的强镜面反射组成的通道进行网络建模，且多余延迟小于位时间。分析表明，误码概率很大程度上取决于频谱中零点的位置。还分析了在空位置上平均的误码概率。对于不进行预检测滤波的情况，平均误码率取决于空值的深度，而不取决于宽度。性能损失（相对于AWGN环境）以（1- / spl Gamma /）/ sup -2 / 2为限，即空值的深度。对于预检滤波，平均误码率取决于空值的宽度和深度。性能损失受（1- / spl Gamma /）/ sup -2 / spl Gamma //的限制，该损失比没有预检测过滤的情况要小。

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