On the Variable Capacity Property of CC/DS-CDMA Systems

On the Capacity of Cdma Systems

The per-chip capacity of a CDMA communication channel with a varying number of users is calculated. It was assumed that users transmit using BPSK modulation and that the receiver achieves chip-synchronous decoding; therefore inter-symbol interference was ignored. In such a channel, CDMA is characterized by its chipwise operation, which can be accurately modeled as an additive channel. The perch...

CDMA Systems Capacity Engineering

On the Shannon capacity of chaos-based asynchronous CDMA systems

We here compare the limit performance asynchronous DS-CDMA systems based on different set of spreading sequences, namely chaos-based, ideal random, Gold codes and maximum-length codes. To do so we consider the Shannon capacity associated to each of those systems that is itself a random variable depending on the relative delays and phases between different users. The statistical features of such...

On the shadowing property of nonautonomous discrete systems

In this paper we study shadowing property for sequences of mappings on compact metric spaces, i.e. nonautonomous discrete dynamical systems. We investigate the relation of  weak contractions with shadowing and h-shadowing property.

Comments on 'The coverage-capacity tradeoff in cellular CDMA systems'

In cellular CDMA systems that employ single-user detectors, in-cell interference limits the coverage of the cell. Thus for a given upper limit on transmit power, the coverage of a cell is inversely proportional to the number of users in it. This tradeoff between coverage and number of users is explicitly characterized here. Our analysis may be used in cellular planning to set hard limits on the...