Conference Paper
Performance of Hybrid DirectSequence TimeHopping Ultrawide Bandwidth Systems in NakagamiM Fading Channels
DOI: 10.1109/PIMRC.2007.4394238 Conference: Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on
Source: IEEE Xplore

Conference Paper: Performance of Multi Scale Direct Sequence UltraWideband Signals for Nakagamim Fading.
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ABSTRACT: Multiscale direct sequence ultrawideband (MS/DSUWB) is a new multiple access technique for UWB systems which utilizes the dyadic scaled orthogonal wavelets spread by direct sequence (DS) codes. It has dyadic scaled multiband structure exposing the scalability of the spectrum. This paper presents the probability of error analysis for the MS/DSUWB system for Nakagamim small scale fading which is suitable for UWB sensor networks. The performance of a MS/DSUWB is compared with a multiprocessing gain (MPG) DSUWB system. It is observed that the MS/DSUWB outperforms substantially the MPG/DSUWB scheme over a Nakagamim fading channel.Proceedings of the Global Communications Conference, GLOBECOM 2011, 59 December 2011, Houston, Texas, USA; 01/2011  [Show abstract] [Hide abstract]
ABSTRACT: Design of highefficiency lowcomplexity detection schemes for ultrawide bandwidth (UWB) systems is highly challenging. This contribution proposes a reducedrank adaptive multiuser detection (MUD) scheme operated in least biterrorrate (LBER) principles for the hybrid directsequence timehopping UWB (DSTH UWB) systems. The principal component analysis (PCA)assisted rankreduction technique is employed to obtain a detection subspace, where the reducedrank adaptive LBERMUD is carried out. The reducedrank adaptive LBERMUD is free from channel estimation and does not require the knowledge about the number of resolvable multipaths as well as the knowledge about the multipaths’ strength. In this contribution, the BER performance of the hybrid DSTH UWB systems using the proposed detection scheme is investigated, when assuming communications over UWB channels modeled by the SalehValenzuela (SV) channel model. Our studies and performance results show that, given a reasonable rank of the detection subspace, the reducedrank adaptive LBERMUD is capable of efficiently mitigating the multiuser interference (MUI) and intersymbol interference (ISI), and achieving the diversity gain promised by the UWB systems.IEEE Transactions on Vehicular Technology 04/2011; · 2.06 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this paper a range of reducedrank adaptive multiuser detectors (MUDs) are proposed and investigated for the hybrid directsequence timehopping ultrawide bandwidth (DSTH UWB) systems. The adaptive MUDs are operated based on the recursive least square (RLS) principles. Three types of reducedrank techniques are investigated, which are the principal component (PC), crossspectral metric (CSM) and Taylor polynomial approximation (TPA). These reducedrank adaptive techniques are beneficial to achieving lowcomplexity, high spectralefficiency and robust detection in hybrid DSTH UWB systems. In this contribution bit error rate (BER) performance of the hybrid DSTH UWB systems using proposed reducedrank adaptive MUDs is investigated by simulations, when communicating over UWB channels modelled by the SalehValenzuela (SV) channel model. Our simulation results show that, given a sufficiently high rank of the detection subspace, the reducedrank adaptive MUDs are capable of achieving a similar BER performance as that of the fullrank ideal minimum meansquare error MUD (MMSEMUD) but with significantly lower detection complexity. Furthermore, the TPAbased reducedrank adaptive MUD is capable of yielding a better BER performance than the PC or CSMbased reducedrank adaptive MUD, when the same but relatively low rank detection subspace is assumed.IEEE Transactions on Wireless Communications 02/2010; · 2.42 Impact Factor
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