NDLI: Increasing CDMA capacity using multiple orthogonal spreading sequence sets and successive interference cancellation

Content Provider	IEEE Xplore Digital Library
Author	Vanhaverbeke, F. Moeneclaey, M. Sari, H.
Copyright Year	2002
Description	Author affiliation: TELIN/DIGCOM, Ghent Univ., Gent, Belgium (Vanhaverbeke, F.; Moeneclaey, M.)
Abstract	In this paper, we present a code-division multiple access (CDMA) system with a spreading factor of N that can accommodate up to mN users, where m/spl ges/2. The m sets of orthogonal spreading sequences are constructed by overlaying the same N orthogonal Walsh-Hadamard sequences with a set-specific pseudo-noise (PN) sequence. Interference between user signals from different sets is cancelled by means of soft-decision iterative interference cancellation. We show that this technique, which is referred to as m-OCDMA, can accommodate more users and is computationally less complex than conventional PN-CDMA with the same type of interference cancellation. Assuming BPSK transmission over an additive white Gaussian noise (AWGN) channel and perfect power control, a degradation of 0.4 dB at the BER of 10/sup -5/ in m-OCDMA is obtained with 2.56N users in the uplink or 3.03N users in the downlink. In PN-CDMA, this figure is 2.16N for both the uplink and the downlink.
Starting Page	1516
Ending Page	1520
File Size	241967
Page Count	5
File Format	PDF
ISBN	0780374002
DOI	10.1109/ICC.2002.997103
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-04-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Interference cancellation AWGN Downlink Additive white noise Noise cancellation Binary phase shift keying Frequency conversion Time division multiple access Error correction
Content Type	Text
Resource Type	Article

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