NDLI: Equivalence of CDMA, FDMA, and TDMA over Gaussian overloaded channels

Content Provider	IEEE Xplore Digital Library
Author	Joon Ho Cho
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA (Joon Ho Cho)
Abstract	It is often claimed that frequency-division multiple-access (FDMA) und time-division multiple-access (TDMA) are inferior to code-division multiple-access (CDMA) in the sense that they have hard limits on the user capacity while the performance of CDMA systems degrade gradually as the number of users increases. In this paper, it is shown that FDMA and TDMA systems with flat spectrum pulses are equivalent to optimum CDMA systems for multiple-access communications over Gaussian overloaded channels. Optimal transmit and receive waveforms are employed to minimize the output mean-squared errors of linear receivers, and equal-power users are assumed with strictly hand-limited continuous-time channels. Using a frequency domain approach, a necessary and sufficient condition is derived for the optimally of a multiple-access scheme. The continuous-time equivalents of Welch bound equality (CTE- WBE) sequences are defined and, as transmit waveforms, shown to comprise the optimal systems together with the matched filter receivers. The equivalence is verified by showing that FDMA and TDMA signals with flat spectrum pulses are CTE-WBE sequences.
Starting Page	519
Ending Page	524
File Size	315059
Page Count	6
File Format	PDF
ISBN	0780383443
ISSN	15253511
DOI	10.1109/WCNC.2004.1311598
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Frequency division multiaccess Time division multiple access Degradation Frequency domain analysis Bandwidth System performance Transmitters Sufficient conditions Matched filters
Content Type	Text
Resource Type	Article

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