Implementation of LEO CDMA Satellite TrAnsmitter Dased on FPGA

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.