In this article, we explore the relationship between an equalizer and a combiner operating on the available polarization states of a received signal in aeronautical mobile telemetry. The maximum likelihood combiner is derived and shown to be equivalent to summing the outputs of two filters matched to the channels in the horizontal and vertical polarization states. For historical reasons, current systems combine right-hand and left-hand circularly polarized antenna feed outputs using a maximum ratio combiner. To compare the two combining approaches, the aeronautical telemetry multipath channel is extended to include polarization state information. The channel extension is used in computer simulations. The simulations results for SOQPSK-TG with a constant modulus algorithm equalizer show that the postequalizer bit error rate for the two approaches is the same.

中文翻译：

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航空移动遥测中的偏振、组合和均衡


在本文中，我们探讨了在航空移动遥测中对接收信号的可用偏振态进行操作的均衡器和组合器之间的关系。最大似然组合器被导出并被证明相当于将与水平和垂直偏振状态下的信道匹配的两个滤波器的输出相加。由于历史原因，当前系统使用最大比组合器组合右手和左手圆极化天线馈电输出。为了比较这两种组合方法，航空遥测多径信道被扩展以包括偏振状态信息。通道扩展用于计算机模拟。具有恒模算法均衡器的 SOQPSK-TG 的仿真结果表明，两种方法的后均衡器误码率是相同的。