To overcome the defects of current convolutional code decoders in occupying too much resource and being with low working frequency,a new decoder of(2,1,8) convolutional code based on Viterbi algorithm is designed.To effectively improve the operating frequency of the decoder,registers are used to store the path metrics and survivor path of each state.By analyzing the relationship among one state and its former states which come to it,a simple way to realize the process in hardware is found.The minimum register width for storing the path metric of each state is calculated by analyzing the change rule of the path metric difference between any two states.The source code is written and then compiled,synthesized and simulated on the Quartus2 integrated development platform.The experimental results show that the decoder not only has a higher working frequency and shorter output delay,but also consumes less resource,and thus is of certain practical value.

P4处理器推出已经足足有年多的时间了,而P4处理器的接口也从Socket423更改为Socket478、核心从最早的Willamette更换为Northwood、制作工艺也从原先的0.18微米更新到0.13微米.随着Northwood系列的推出,英特尔这款桌面型处理器的旗舰产品也完全得到市场的认可,Pentium 4终于如愿以偿地稳坐市场的主流位置,虽然AMD仍然依靠着自己的性价比优势顽强奋战,但Inel凭着自己成熟独到的市场策略和多年积累的品牌影响力,Pentium 4成为了目前CPU市场的主流.