White Papers

Bounds on the Sum Capacity of Synchronous Binary CDMA Channels

Overview This paper obtains a family of lower bounds for the sum capacity of Code Division Multiple Access (CDMA) channels assuming binary inputs and binary signature codes in the presence of additive i.i.d. noise with an arbitrary distribution. The envelope of this family gives a relatively tight lower bound in terms of the number of users, spreading gain and the noise distribution. The derivation methods for the noiseless and the noisy channels are different but when the noise variance goes to zero, the noisy channel bound approaches the noiseless case. The behavior of the lower bound shows that for small noise power, the number of users can be much more than the spreading gain without any significant loss of information (overloaded CDMA).

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Publisher
Sharif University of Technology
File Format
PDF
Date Published
Apr 15, 2009
Format
White Papers
Topics
TDMA - CDMA, Mobile - Wireless Communications

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