NDLI: Bit Error Probabilities for Ultra-Wideband DS- and Hybrid DS/TH-CDMA with Arbitrary Chip-Duty

Content Provider	IEEE Xplore Digital Library
Author	Rahman, M.A. Sasaki, S. Jie Zhou Kikuchi, H.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Electron. Eng., Niigata Univ. (Rahman, M.A.; Sasaki, S.; Jie Zhou; Kikuchi, H.)
Abstract	In this paper, ultra-wideband (UWB) multiple access systems are introduced by using direct-sequence (DS) and hybrid direct-sequence time-hopping (DS/TH) code division multiple access (CDMA) that use arbitrary chip-duty of the spreading sequences. The bit error probabilities are presented. First of all, the variances of the multiple access interference are developed. Afterwards, various approximations are applied. The standard Gaussian approximation (SGA) for the DS system is shown to become extremely optimistic as the chip-duty becomes low. Though the hybrid system performs better, the SGA still remains optimistic. To obtain accurate results Holt/man's simplified improved Gaussian approximation (SIGA) and Morrow and Lehnert's improved Gaussian approximation (IGA) are used. A shortcoming of SIGA is rediscovered that renders it unusable for low-duty DS systems. However, for the hybrid system, the SIGA works as an excellent tool. The IGA is used to get accurate results for the low-duty DS systems. It is shown that lowering of chip-duty by keeping chip rate and chip length unchanged improves performance for asynchronous DS and both asynchronous and synchronous hybrid systems. However, under the same processing gain, a high-duty system performs better than a low-duty system. Performance of synchronous DS system remains independent of chip-duty
Starting Page	1202
Ending Page	1207
File Size	1338160
Page Count	6
File Format	PDF
ISBN	0780393058
DOI	10.1109/WIRLES.2005.1549583
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Error probability AWGN Error analysis Multiple access interference Binary phase shift keying Multiaccess communication Pulse modulation Gaussian approximation Ultra wideband technology Random sequences
Content Type	Text
Resource Type	Article

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