Abstract: This paper focuses on the Dual-Carrier Modulation（DCM） technology in the Ultra Wide Band（UWB） wireless communication system.A new demodulation algorithm—getting fully usage of frequency diversity in the UWB channel is proposed.System simulator result shows that the proposed method can get 1.5 dB gain at the Per（Packet error） performance of 8% while the data rate is 480 Mb/s under IEEE CM1 channel.What’s more，the method can be implemented by a much fewer complexity hardware architecture，for it avoids LLR calculation in the traditional method.

Key words: Dual-Carrier Modulation（DCM）, Ultra Wide Band（UWB）, diversity, demodulation

摘要： 研究基于多带-正交频分复用（MB-OFDM）超宽带系统中的双载波调制解调技术。在分析双载波（DCM）调制特点的基础上，针对超宽带系统频率选择性信道的特点，提出了利用频域分集信息的双载波解调算法，进一步提高系统性能。仿真结果表明系统在速率为480 Mb/s的IEEE CM1信道下，要达到小于8%的误包率性能，只需信噪比为8.5 dB，比现有文献水平提高了1.5 dB的增益。在算法的实现中摒弃了传统信号检测LLR算法中的对数运算，易于低功耗低成本的硬件实现。

关键词: 双载波调制, 超宽带系统, 分集, 解映射