面向LTE-A终端软基带的矢量处理器设计

面向移动终端处理器的低功耗、低成本、高效率、灵活升级的需求,本文在对LTE-A基带算法并行性分析的基础上,提出了一种基于超长指令字（Very Long Instruction Word,VLIW）和单指令多数据（Single Instruction Multiple Data,SIMD）混合结构的矢量处理器作为终端软基带解决方案.该矢量处理器采用变长的VLIW指令字,共有7条矢量数据通路,每条通路可执行16个16bit的定点运算;采用分组的系数存储器提高灵活性,受限访问的寄存器组降低电路面积;同时设计了SHUF和ISHUF指令专门用于快速傅里叶变换（FFT）和雏特比（vIT-ERBI）译码算法的矢量化实现.最后本文实现和分析了FFT和VITERBI译码算法.

Vector Processor for Soft Baseband Terminals

To satisfy the low power, low cost, high efficiency and flexible upgrade requirements of mobile terminal processor, we propose a Very Long Instruction Word （VLIW） and Single Instruction Multiple Data （SIMD） mixed structure vector processor by analyzing the parallelism of LTE - A baseband algorithm. The vector processor adopts variable length VLIW; owns 7 vector data paths, each of which contains 16 scalars; banked coefficient memory is adopted for higher flexibility and access restricted register file for smaller circuit area; SHUF and ISHUF instruction is proposed to complete the parallel implementation of Fast Fourier Transform （FFT） and VITERBI algorithm. Finally, we implement and analyze FFT and VITERBI algorithm.