Re has a very complicated interconnections and needs a high power consumption . tb needs a large quantity of buffers and has long decoding delay . in this paper a modified register - exchange ( re ) method is presented , which reduce its memory access rate and its amount of memory , thus , reduces the power consumption 在smu中,由于要進行頻繁的存儲器讀寫,功耗很大,成為整個viterbi譯碼器中消耗功率最大的單元,因此對smu單元進行低功耗設(shè)計對降低viterbi譯碼器的功耗起著非常重要的作用。