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本文介绍一个在一般遥测用射频信道上实现16路沃尔什复用(序率分割复用)系统(SDM)的实验。沃尔什函数作为付载波经带限信道后其波形要产生上升、下降沿,这将导致各路间的正交误差。为此引进间断开关将脉冲上升下降沿部分切除,得到间断沃尔什付载波,它仍是一组正交函数。这样在视频带宽320KHz的通道上传输16路沃尔什多路信号时其正交误差可忽略不计。而误差的主要来源是射频通道非线性引起的交叉干扰,但在目前射频通道的一般水平上交叉干扰最大值小于5％,这已满足一般的工程要求。因此SDM作为一个与FDM和TDM相平行的多路复用系统是完全能用于遥测中的。
This article describes an experiment to achieve a 16 Walsh Multiplexing (Sequential Division Multiplexing) system (SDM) on a general telemetry RF channel. The Walsh function, as a carrier wave, passes through the band limited channel to produce a rising and falling edge waveform. This will result in quadrature errors among the paths. To this end, the introduction of intermittent switch will be part of the rising and falling edge of the pulse cut off, get interrupted Walsh paid carrier, it is still a set of orthogonal function. This orthogonal error is negligible when transmitting 16 Walsh multipath signals over a channel of 320KHz video bandwidth. The main source of error is the cross-talk caused by the non-linearity of the radio frequency channel. However, the maximum cross-talk on the current RF channel is less than 5%, which meets the general engineering requirements. Therefore, SDM as a parallel system with FDM and TDM multiplexing system can be fully used in telemetry.