Abstract: Satellite communication is widely used in fields such as encrypted communication and emergency communication. Its baseband processing algorithm is relatively complex and requires strong computing power support. Traditional FPGA and DSP platforms have a long development cycle, while GPU-based software-defined radio (SDR) solutions are convenient and have excellent performance. This paper proposes a group of baseband algorithms for satellite communication based on GPU, which realizes high-speed processing of the satellite communication downlink. Experimental results show that the GPU-based satellite communication link meets the lowest latency requirements, and the maximum baseband processing speed reaches 978Mbps.

Key words: 5G, satellite communication, low density parity check(LDPC), Viterbi, read-solomon(RS)