The tradeoff between processing gains of an impulse Radio UWB system in the presence of timing jitter
Author
Gezici, Sinan
Molisch, A. F.
Poor, H.V.
Kobayashi, H.
Date
2007Source Title
IEEE Transactions on Communications
Print ISSN
0090-6778
Electronic ISSN
1558-0857
Publisher
Institute of Electrical and Electronics Engineers
Volume
55
Issue
8
Pages
1504 - 1515
Language
English
Type
ArticleItem Usage Stats
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Abstract
In time hopping impulse radio, Nf pulses of duration Tc are transmitted for each information symbol. This gives rise to two types of processing gains: i) pulse combining gain, which is a factor Nf, and (ii) pulse spreading gain, which is Nc=Tf/Tc, where Tf is the mean interval between two subsequent pulses. This paper investigates the tradeoff between these two types of processing gains in the presence of timing jitter. First, an additive white Gaussian noise (AWGN) channel is considered, and approximate closed-form expressions for bit error probability (BEP) are derived for impulse radio systems with and without pulse-based polarity randomization. Both symbol-synchronous and chip-synchronous scenarios are considered. The effects of multiple-access interference (MAI) and timing jitter on the selection of optimal system parameters are explained through theoretical analysis. Finally, a multipath scenario is considered, and the tradeoff between processing gains of a synchronous impulse radio system with pulse-based polarity randomization is analyzed. The effects of the timing jitter, MAI, and interframe interference (IFI) are investigated. Simulation studies support the theoretical results.
Keywords
Impulse radio ultra wideband (IR-UWB)Interframe interference (IFI)
Multiple-access interference (MAI)
Rake receiver
Timing jitter