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The impulse response of a typical wireless multipath channel can be modeled as a tapped delay line filter whose non-zero components are sparse relative to the channel delay spread. In this paper, a novel method of estimating such sparse multipath fading channels for OFDM systems is explored. In particular, Sparse Bayesian Learning (SBL) techniques are applied to jointly estimate the sparse channel...
In this paper, a time and frequency (TF) domain spreading multicarrier direct sequence code division multiple access (MC-DS-CDMA) scheme employing zero correlation zone (ZCZ) sequences, designed specifically for quasi-synchronous uplink transmissions, is proposed to exploit frequency and temporal diversity in frequency-selective block-fading channels. This is in contrast to previously proposed schemes...
Ultra-wideband (UWB) communications exhibit many unique characteristics, one of which is the random clustering phenomenon in the resolved channel multipaths. The randomness in path arrivals will, however, make exact performance analysis quite challenging. In this paper, an analytical framework for precise performance characterization of communications over the generic IEEE 802.15.4a channel structure...
Cyclic delay transmit diversity (CDTD) using frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion is a powerful technique to improve the bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) signal transmission in a frequency-selective fading channel. CDTD simultaneously transmits the same signal from different antennas after...
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