Code-spread CDMA with interference cancellation

The performance of an asynchronous code division multiple access (CDMA) system (uplink) employing very low-rate maximum free distance codes for combined coding and spreading is analyzed when successive or parallel interference cancellation is applied. An analytical approach to the evaluation of the...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 1999-12, Vol.17 (12), p.2090-2095
Main Authors: Frenger, P.K., Orten, P., Ottosson, T.
Format: Article
Language:English
Subjects:
Analytical models
Bit error rate
Cancellation
Channel capacity
Channel coding
Code division multiple access
Convolutional codes
Detectors
Interference
Interference cancellation
Matched filters
Mathematical analysis
Multiaccess communication
Performance analysis
Simulation
Spreading
Spreads
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Summary:The performance of an asynchronous code division multiple access (CDMA) system (uplink) employing very low-rate maximum free distance codes for combined coding and spreading is analyzed when successive or parallel interference cancellation is applied. An analytical approach to the evaluation of the bit error rate is presented and shown to give results close to simulations. Our results show that the code-spread system outperforms the conventionally coded and spread system. Without interference cancellation the single-user bound is never reached (except for one user). With two stages of parallel interference cancellation, a code-spread system with a load only slightly less than 1 bit/chip can obtain a bit error rate very close to that of a single-user system.
ISSN:0733-8716
1558-0008
DOI:10.1109/49.814815