Satellite data distribution in video transponder band-edge using 512 Kb/s SQAM

The experimental results of a one-month system field trial using a 512 kb/s superposed quadrature amplitude modulation (SQAM) satellite transceiver are described. The impact of cochannel and adjacent channel interference on the computer-simulated and measured performance of the band-edge system is investigated, and the corresponding bit error rate (BER) is analyzed. As an example application, International Datacasting Corporation's digital audio broadcasting system is discussed. The dispersed spectrum of the video carrier interference is found to be sufficiently low in power to allow high-performance band-edge data transmission with excellent BER. The data link provided 99.8% error-free minutes over a 24-h broadcasting period with degradation to neither video picture quality nor to subcarrier services. Close to compact disc quality digital audio was delivered.<
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