WLCp1-04: Exploring Maximum Doppler Diversity by Doppler Domain Multiplexing

Doppler effect induced by temporal fading variation provides Doppler diversity, which can be exploited to combat the impairments caused by multipath fading. In this paper, a Doppler domain multiplexing (DDM) communication structure is presented to explore the potential Doppler diversity. Data streams in DDM system are encoded and multiplexed at different Doppler shifts to achieve both Doppler diversity and high spectral efficiency. Theoretical performances of both uncoded and coded DDM systems are analyzed. The analytical results show that DDM structure can effectively exploit the potential Doppler diversity inherent in time- varying fading. A sub-optimum decoder with Doppler domain equalization and soft maximum a posteriori decoding is employed to recover the data at the communication receiver. Simulation results show that significant performance gains can be achieved by DDM system over conventional time domain system.