NDLI: A RAKE Combining Scheme for an Energy Detection Based Noncoherent OOK Receiver in UWB Impulse Radio Systems

Content Provider	IEEE Xplore Digital Library
Author	Peng, X. Chin, F. Wong, S.H. Sam, K.Y. Zhongding, L.
Copyright Year	2006
Description	Author affiliation: Inst. for Infocomm Res., Singapore (Peng, X.; Chin, F.; Wong, S.H.; Sam, K.Y.; Zhongding, L.)
Abstract	Ultra-wideband (UWB) impulse radio systems based on non-coherent on-off keying (OOK) energy detection are relatively simpler to implement than their coherent counterparts, because the strict synchronization requirements are relaxed. However, the design challenge is to set a hard decision threshold value after energy detection because the detected energy may vary due to multipath fading and inter-pulse interference (IPI). Moreover, to find and track the starting point of the integration for energy detection, a timing recovery block is needed. This block requires a fairly accurate phase-locked loop (PLL) circuit, the cost of which is prohibitive for a low cost and low power UWB device. In this paper, we propose an orthogonal code sequence with RAKE combining for an energy detection based noncoherent OOK receiver. It uses a RAKE combiner with soft despreading to combat the severe IPI. With this structure, threshold setting for conventional energy detector can be avoided and a larger integration timing offset can be tolerated. Simulation results show that the energy detection based OOK receiver using the proposed orthogonal code sequence and the RAKE combining scheme can improve packet error rate performance significantly in a dense multipath fading channel
Starting Page	73
Ending Page	78
File Size	6046051
Page Count	6
File Format	PDF
ISBN	1424401011
DOI	10.1109/ICU.2006.281518
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Costs Error analysis Circuits Energy Detection Interference On-Off Keying Phase locked loops RAKE RAKE receivers Impulse Radio Detectors Ultra-Wideband Timing Ultra wideband technology
Content Type	Text
Resource Type	Article

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