Abstract: Dual Carrier Modulation(DCM) technology is chosen as the higher data rate modulation technology in Wireless USB system. Different demodulation methods for the DCM are presented, including soft bit, Maximum Likely(ML) soft bit and Log Likelihood Ratio(LLR). Frequency diversity and Channel State Information(CSI) are further technologies to enhance the system decoding. Experimental results show that using LLR demodulation methods with frequency diversity and CSI decoding technologies can maximize system transmission performance.

Key words: Dual Carrier Modulation(DCM), soft-bit, Maximum Likelihood(ML), Log Likelihood Ratio(LLR), frequency diversity, channel state information

摘要： 双载波调制技术是无线通用串行总线系统在高速率传输时的调制模式，根据双载波调制技术提出软比特、最大似然、数似然比 3种解调方法，采用频率分集和信道状态信息作为辅助解调技术来提高系统解码性能。实验结果证明，在频率分集和信道状态信息2种辅助解调技术下，使用数似然比解调方法能使无线通用串行总线系统传输性能达到最大。

关键词: 双载波调制, 软比特, 最大似然, 数似然比, 频率分集, 信道状态信息

CLC Number: 

• TP393