基于差分酉空频调制的多天线DAB系统  

MIMO-DAB Based on Differential Unitary Space-Frequency Modulation

作　　者：武岩波[1] 安建平[1] 卜祥元[1] 卢尧[1] 

机构地区：[1]北京理工大学信息科学技术学院电子工程系,北京100081

出　　处：《北京理工大学学报》2007年第8期695-699,共5页Transactions of Beijing Institute of Technology

基　　金：北京市自然科学基金资助项目(4052024)

摘　　要：在数字音频广播(DAB)系统基础上,引入酉空时码,提出了基于差分酉空频调制(DUSFM)的多天线DAB系统.该系统采用卷积码、时频交织和差分酉空频调制级联的编码调制形式,对无信道状态信息也可实现解调.理论推导证明所提系统可同时获得空、时、频三种分集.通过蒙特卡洛仿真,证实在时频双选信道、4发1收的条件下,为达到0.001的误码率,所提系统比原DAB系统有6.5 dB的信噪比增益,而同条件下CDD-DAB方案的信噪比增益仅为1.0 dB.从而验证了所提系统具有较高的分集增益.Unitary space-time codes were introduced to the digital audio broadcasting （DAUB） system, and a multiple-antenna DAB system based on differential unitary space-frequency modulation （DUSFM） was proposed, which adopts a concatenation of convolutional encoder, time interleaver, frequency interleaver and DUSFM. In DUSFM-DAB, the receiver can perform demodulation without channel status information. Theoretical deduction proved that the DUSFM-DAB can obtain full spatial, temporal, and frequency diversities. By Monte Carlo simulation, with time-frequency selective fading 4 ×1 MIMO channel, to achieve a 0.001 bit-error-rate, the performance of the proposal scheme has a 6.5 dB SNR benefit compared with that of the original DAB, while the SNR benefit of CDD- DAB is 1.0 dB in the same condition, which verifies that the DUSFM-DAB has a higher diversity gain.

关 键 词：差分调制 酉空时码 多天线正交频分复用 数字音频广播 分集 

分 类 号：TN911.3[电子电信—通信与信息系统]