| Abstract: | Previously proposed differential modulation schemes for time-varying channels may not achieve the full transmit diversity and the maximum Doppler diversity simultaneously. Based on an existing basis expansion model, a new differential space-time code, which wisely combines interleaver/de-interleaver with traditonal space-time transmitting technique to overcome such limitation, is presented. Two noncoherent differential decoders, named decision-feedback differential detector(DF-DD)and Viterbi-algorithm-based multiple-symbol-detection differential detector(MSD-DD), are also derived. We show that our design may recover data symbols with full antenna diversity and the maximum Doppler diversity at high signal-to-noise ratio. System performance is evaluated with simulations. |
