基于差分酉空频调制的多天线DAB系统

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.

MIMO-DAB Based on Differential Unitary Space-Frequency Modulation

Unitary space-time codes were introduced to the digital audio broadcasting(DAB) 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.