| Publisher | Sharif University of Technology | ||
|---|---|---|---|
| Format | 337.8KB PDF | Date added | 30 Dec 2008 |
| Topics | TDMA - CDMA, Mobile - Wireless Communications | ||
| Downloads | 6 | ||
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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