中文摘要：

提出了一种性能优化的Benes网络结构作为开关网络用于WiMAX系统中的低密度奇偶校验码译码器．该网络结构在译码器的输入数目不是2的指数时，能获得最优化的性能．该网络结构是非阻塞的并且可以实现输入输出之间的任何排列组合，因此可以支持WiMAX系统中规定的19种模式．为了减少网络结构的硬件复杂度，提出一种用来产生该网络中所有2×2开关的控制信号的高效算法．同时，使用该高效算法可以减少整个网络的延时．结果表明，该控制信号的生成电路可以节省25．4％的芯片面积，并且总体网络的延时可以缩短36．2％．

英文摘要：

A modified Benes network is proposed to be used as an optimal shuffle network in worldwide interoperability for microwave access （WiMAX） low density parity check （LDPC） decoders, When the size of the input is not a power of two, the modified Benes network can achieve the most optimal performance. This modified Benes network is non-blocking and can perform any sorts of permutations, so it can support 19 modes specified in the WiMAX system. Furthermore, an efficient algorithm to generate the control signals for all the 2 × 2 switches in this network is derived, which can reduce the hardware complexity and overall latency of the modified Benes network. Synthesis results show that the proposed control signal generator can save 25.4% chip area and the overall network latency can be reduced by 36. 2%.