Present day requirements of high quality audio and video surveillance has instigated research interests in wireless multimedia sensor networks (WMSN). In order for the WMSN to achieve trademark performance in audio an...
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ISBN:
(纸本)9781467377010
Present day requirements of high quality audio and video surveillance has instigated research interests in wireless multimedia sensor networks (WMSN). In order for the WMSN to achieve trademark performance in audio and video surveillance applications, certain design requirements must be met. In this work, we identify vital design issues affecting diversity gain in conditions especially, where channel fading characteristics fluctuate rapidly. We apply the cooperative communication technique in WMSN to create a framework that optimizes diversity gain in an environment where channel state information (CSI) is unknown. We then discuss promising research directions for optimizing diversity gain and non-coherent communication efficiency in cooperative WMSN.
Present day requirements of high quality audio and video surveillance has instigated research interests in wireless multimedia sensor networks (WMSN). In order for the WMSN to achieve trademark performance in audio an...
详细信息
ISBN:
(纸本)9781467377027
Present day requirements of high quality audio and video surveillance has instigated research interests in wireless multimedia sensor networks (WMSN). In order for the WMSN to achieve trademark performance in audio and video surveillance applications, certain design requirements must be met. In this work, we identify vital design issues affecting diversity gain in conditions especially, where channel fading characteristics fluctuate rapidly. We apply the cooperative communication technique in WMSN to create a framework that optimizes diversity gain in an environment where channel state information (CSI) is unknown. We then discuss promising research directions for optimizing diversity gain and noncoherent communication efficiency in cooperative WMSN.
OFDM (Orthogonal Frequency Division Multiplexing) can effectively eliminate the ISI between different symbols and has high frequency efficiency. OFDM is sensitive to the Doppler frequency offset caused by moving that ...
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OFDM (Orthogonal Frequency Division Multiplexing) can effectively eliminate the ISI between different symbols and has high frequency efficiency. OFDM is sensitive to the Doppler frequency offset caused by moving that can be overcome by space-timecoding. So the application the combination of the space-timecoding and OFDM in next generation wireless telecommunications has attracted more and more attention. In this article, the structure of DSTBC (differential space-time block coding) combined with OFDM system is given first. Because of no need of channel estimation, the complexity of the receiver is simpler than STBC-OFDM system. Then, performance comparison is made by simulation among pure OFDM system, STBC-OFDM system and DSTBC-OFDM system under Rayleigh fading channel and SUI channel. It is concluded that the STBC-OFDM system can be replaced by DSTBC-OFDM system under stationary or low to moderate velocity conditions.
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