低轨道卫星CDMA系统发信机的FPGA实现
doi: 10.3724/SP.J.1146.2006.01467
Implementation of LEO CDMA Satellite TrAnsmitter Dased on FPGA
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摘要: 该文研究了低轨道(LEO)卫星CDMA系统发信机的数字部分，介绍了其结构、算法原理及其具体实现。重点介绍了发信机数字信号处理部分在FPGA的实现，主要包括信息数据流的处理及编码、交织、成型滤波、CIC插值滤波和数字上变频等。在设计上采用了基于多相滤波结构和分布式算法(DA)的成型滤波器以及高效CIC插值滤波器，节省了系统的硬件资源，提高了系统的性能。Abstract: In this paper, digital part of LEO CDMA satellite transmitter is researched, and its structure, algorithm and implementation are introduced.The emphasis is pressed upon implementation of signal processing part of the digital transmitter, especially upon the processing of data stream, the shaping filtering, interpolating CIC filtering, and digital up-converting, etc. This method uses the shaping filter based on polyphase filter and Distribute Arithmetic(DA) and efficient CIC interpolating filter, and with this method the performance of the transmitter and the usage of resource have been remarkably improved.
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