NDLI: Performance of convolutionally coded CDMA/OFDM in a frequency-time selective fading channel and its near-far resistance

Content Provider	IEEE Xplore Digital Library
Author	Fazel, K.
Copyright Year	1994
Description	Author affiliation: Inst. for Commun. Technol., German Aerosp. Res. Establ., Oberpfaffenhofen, Germany (Fazel, K.)
Abstract	The OFDM technique is an interesting approach in mobile communications in order to achieve a high spectral efficiency and to combat the frequency selectivity of the channel. Another interesting technique is a CDMA system with Rake-receiver. The main advantages of CDMA are well known, but its capacity is limited by multiuser interference. The aim of this study is to analyze the performance of a convolutionally-coded CDMA system combined with OFDM in a frequency/time selective fading channel, taking into account the near-far problem. This combination allows one to perform a maximum-likelihood detection (MLD), to use the available spectrum in an efficient way, to exploit frequency diversity and time diversity (provided by channel coding), and to retain many advantages of a CDMA system with a simpler hardware realization. An example for a mobile communication system using convolutionally-coded CDMA/OFDM with Walsh-Hadamard code-spreading for the downlink (base-mobile) is studied. The performance of a MLD is examined by taking into account the near-far problem. It is shown that the MLD is very robust to the near-far problem. It is also shown that by using BPSK modulation, in a 1.28 MHz bandwidth, one can transmit 64 active users at rate of about 10.34 kbit/sec.<>
Starting Page	1438
Ending Page	1442
File Size	538147
Page Count	5
File Format	PDF
ISBN	0780318250
DOI	10.1109/ICC.1994.368869
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-05-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Convolutional codes Multiaccess communication OFDM Mobile communication Interference Performance analysis Fading Maximum likelihood detection Frequency diversity Channel coding
Content Type	Text
Resource Type	Article

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