现场可编程门阵列参数化多标准高吞吐率基4 Viterbi译码器

为了同时达到高性能和灵活性的目标，提出一种基于现场可编程门阵列的参数化多标准自适应基4 Viterbi译码器。译码器采用3～9可变约束长度，1/2、1/3可变码率，支持任意截断长度的纠错译码，并采用码字无符号量化、加比选单元设计优化和归一化判断逻辑分离策略优化关键路径设计，提高译码器工作频率。实验结果表明，该译码器能根据用户设定的参数改变结构，在多种通信标准之间实现动态切换；性能达到了541 Mbps，明显优于相关工作；对GPRS，WiMAX，LTE，CDMA，3G等通信标准都取得了良好的误码性能，可满足多种通信标准的译码需求。
To achieve the goal of high performance and flexibility, a parameterized multi-standard adaptive radix-4 Viterbi decoder based on the field-programmable gate array was presented. This decoder adopts constraint lengths ranging from 3 to 9, code rates of 1/2 or 1/3 and supports error-correcting decoding of arbitrary truncation lengths. The unsigned quantization, add-compare-select unit optimization and normalization judgment logic separation strategies were used to optimize the design of critical path, so that it can improve system throughput. Experiment results show that: the decoder can change the structures according to the parameters set by users and achieve dynamic switching in multiple communication standards; the throughput can reach up to 541 Mbps, apparently superior to the related works; the decoder achieves low bit error ratio in multiple standards such as GPRS, WiMax, LTE, CDMA and 3G and satisfies the decoding requirements of multiple communication standards. 