NDLI: Performance analysis of a spread spectrum M-ary orthogonal modulation under multipath fading

Content Provider	IEEE Xplore Digital Library
Author	Hongbao Zhang Rutkowski, D.
Copyright Year	1994
Description	Author affiliation: Inst. of Electron. Syst., Aalborg Univ., Denmark (Hongbao Zhang; Rutkowski, D.)
Abstract	The performance of orthogonal Walsh functions spread spectrum modulation under multipath, selective Rayleigh fading channel is analyzed. This modulation scheme is used for a DS CDMA mobile communication system which is being investigated. Orthogonal modulation and noncoherent detection seems to be suitable for the up-link of a DS CDMA system in which the multi-user interference are more severe than on the down-link. For simplicity, the analysis has been carried out only for a fixed path reception. The results of analysis show that although orthogonal modulation is an effective method to combat the noise and interference in an AWGN channel, under the multipath fading channel and reception based on one path, the performance is still poor. However, a computer simulation under a more practical condition shows that this modulation scheme combined with the RAKE receiver and convolutional encoding will achieve an acceptable performance. A comparison of the simulation results for orthogonal modulation and DPSK shows that the performance of a 64-ary Walsh modulation is nearly 7 dB better than DPSK, while the bandwidth of the latter is 1.5 times more than the former.<>
Starting Page	602
Ending Page	606
File Size	337719
Page Count	5
File Format	PDF
ISBN	0780320468
DOI	10.1109/ICCS.1994.474182
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-11-14
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Performance analysis Spread spectrum communication Fading Multiaccess communication Interference Differential quadrature phase shift keying Mobile communication Additive white noise Gaussian noise AWGN channels
Content Type	Text
Resource Type	Article

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