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Multiple access analysis is presented for pulsed direct sequence (DS) and hybrid DS time hopping (DS/TH) ultra-wideband (UWB) communications considering a Saleh-Valenzuela type clustered frequency selective Nakagami fading channel. A general analytical framework is developed for modeling the multiple access interference (MAI) in low-duty systems that is substantially complicated than analysis of more...
In this paper, we investigate the spatial fading correlation and symbol error rate (SER) performance of M-ray phase shift keying (MPSK) with maximal ratio combining (MRC) for a circular antenna array for two types of angle of arrival (AOA) energy distributions: a uniform AOA energy distribution and a Gaussian AOA energy distribution. The spatial fading correlation and SER performance of a circular...
In this paper, we present the impact of timing jitter on a direct sequence ultra wideband (DS-UWB) system in additive white Gaussian noise (AWGN) and multipath environment. Rake receiver is used to capture the multipath profile. Investigation is performed in ordinary and optimum Rake, each with all Rake (ARake) and selective Rake (SRake). Additionally, the equal gain combining (EGC) maximal ratio...
Multiple antenna systems are promising architectures for overcoming the effects of multi-path interference and increasing the spectrum efficiency. Spatial correlation among antenna elements, due to limited angular spread or insufficient antenna spacing, significantly reduces the performance of the diversity reception systems. In this paper, we explore the performance for circular antenna arrays with...
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