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为解决移动通信系统过载传输,在稀疏图多址接入基础上,将低密度扩频技术拓展至多载波传输系统,设计了基于多载波码分多址(MC-CDMA)的多进制联合稀疏图.该多进制联合稀疏图通过变量节点和置换节点,将低密度扩频矩阵和多进制低密度奇偶校验码(LDPC)校验矩阵结合起来,使得系统的接收端能够在整幅稀疏图上同时完成多用户检测和信道译码.多进制联合稀疏图融合了扩频、多载波调制和信道编码等技术,包含多维信号的综合协作处理.计算机仿真表明,多进制联合稀疏图MC-CDMA在系统严重过载情况下,仍然能达到理想的通信性能.
In order to solve the overload transmission in mobile communication system, based on Sparse Map Multiple Access, the low-density spread spectrum technology is extended to multi-carrier transmission system. Multi-carrier joint sparsity based on multi-carrier code division multiple access (MC-CDMA) The multi-joint federated sparse graph combines a low-density spreading matrix with a multi-parity low-density parity-check-code (LDPC) parity check matrix through a variable node and a permutation node, Multi-user joint detection and channel decoding are also implemented on sparse graphs.Multi-ary joint sparse graph combines the technologies of spread spectrum, multi-carrier modulation and channel coding, including multi-dimensional signal processing.Computer simulation shows that multi-band joint sparsity Figure MC-CDMA in the case of serious system overload, still able to achieve the desired communication performance.