System aspects and transmission impairments of active phased arrays for satellite communications
IEEE Transactions on Aerospace and Electronic Systems(2007)
摘要
The communications link and system aspects of active phased arrays that are used in multiple-beam satellite systems are assessed through measurements and analysis. Three link parameters are investigated and their effects on the overall carrier-to-interference ratio (CIR) are quantified. The first parameter is the intermodulation components that are generated at the nonlinear amplifier outputs and contribute to well-formed interference in the far-field radiation of the array. The second is the bit-error ratio (BER) degradation due to the multi-carrier operation of the active array. Measurement results are shown to demonstrate this effect. The third link parameter is the cochannel interference caused by frequency reuse in multiple-beam systems. The paper starts by reviewing early developments of phased arrays for multiple-beam satellite communications applications. A key component in these developments is the modular monolithic microwave integrated circuit (MMIC) beam-forming matrices that generate a number of simultaneous and independently digitally controlled beams
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关键词
MMIC,cochannel interference,error statistics,phased array radar,satellite communication,telecommunication links,active phased arrays,beam-forming matrices,bit-error ratio degradation,cochannel interference,communications link,intermodulation components,monolithic microwave integrated circuit,multicarrier operation,multiple-beam satellite systems,satellite communications,system aspects,transmission impairments
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