Research On Sparse Code Multiple Access And FPGA Implementation

The 5th generation communication system technologies(5G) are the hot topics among recent researches. The Sparse Code Multiple Access(SCMA)is one of the new non-orthogonal multiple access technologies in 5G, the difference between the SCMA and the other ones is that SCMA encode with sparse codebooks and mapping, which makes both of the encoder and decoder have a simple algorithm. And SCMA has a better overloading factor which infer the SCMA can solve the problem between the increasing accesses and the scarcer spectrum resources.In this paper, our purposes are the implementation of SCMA and optimization of the SCMA algorithm. Finally, we simulate the system to examine the performance and finish the FPGA implementation. Therefore,this paper concludes the following tasks:1?Research on the SCMA with LDPC(Low-Density Parity-Check Code).Due to the high complexity on encoding and decoding with Turbo code, we use LDPC instead of Turbo code as the forward error correction code(FEC).And in order to verify the correctness of this combination and examine its performance, we propose a SCMA uplink communication system model with LDPC.2?Considering the complexity of the implementation of SCMA, we simplify the SCMA decoding algorithm. The simulation results show that the decoding performance of the system with LDPC is better than the one with Turbo code in AWGN channel.3?The simulation of SCMA system and FPGA implementation. This paper finishes the floating-point and fixed-point simulation and implement the whole system on FPGA platform. The experiments show that the system performance is good and FPGA implementation is right. Finally, we summarize the resource consumption and decoding delay of the FPGA implementation.