快速哈达马变换在3G 无线通信中具有广泛的应用。本文在分析快速哈达马变换算法的基础上提出了两种快速哈达马变换的折叠结构,并分别分析了这两种折叠结构的电路结构、时钟频率要求、资源消耗等因素。最后给出了这两种电路结构在Altera FPGA 上实现的对比情况。 关键词: 哈达马变换;折叠;分时复用 The folded structure design of fast Hadamard transform ZHU Jian-guang ( VLSI design center, UESTC, Chengdu 610054,China) Abstract: Fast hadamard transform (FHT) is used widely in 3G wireless communication. This paper proposed two different unfolded structures of FHT, and analyzed the circuit characteristics ,clock speed requirement and resources. Finally we gave the implementation results of the two structures on Altera FPGA. Key words: Fast Hardmad transform;unfolding;time-division multiple used