多码长码率兼容的多元LDPC码及编码器设计

Multi-length and multi-rate compatible nonbinary LDPC code and encoder design

为适应海上无线通信信道的时变特性,突破多元LDPC码长码率不兼容的技术现状,构造一种多码长码率兼容的多元LDPC码,可以实现在多种码长、多种码率间的相互兼容,并完成编码器的设计.借鉴5G二元LDPC码校验矩阵的特殊结构并将其扩展至伽罗华域,设计的多元LDPC码在兼容多码长码率的同时,又拥有优秀译码性能和较低的硬件实现复杂度.该设计在Xilinx xc7k325tffg900-2芯片上进行实现,采用部分并行的编码方式,兼顾编码效率和硬件开销,可以实现五种信息位长和五种码率间灵活切换.工作时钟频率可达370 MHz,在该时钟频率下编码器吞吐率最高可达601.8 Mbps.

In order to adapt to the time-varying channels for maritime wireless communication systems and break through the current state on length and rate incompatibility of nonbinary LDPC.We construct a nonbinary LDPC code which compatible between multiple lengths and multiple rates,and complete the design of the encoder.Drawing on the special structure of the 5 G binary LDPC check matrix and extending it to the Galois field.The designed nonbinary LDPC check matrix not only compatible between length and rate,but also has excellent decoding performance and low hardware implementation complexity.The design is implemented on the Xilinx xc7 k325 tffg900-2 chip.It adopts partial parallel encoding,taking into account the coding efficiency and hardware overhead.It can realize flexible switching between five information lengths and five code rates.The working frequency of the clock can reach 370 MHz,and the encoder throughput can reach up to 601.8 Mbps at this clock frequency.