Analysis of CDMA downlink capacity enhancements

The CDMA downlink capacity obtained by a system simulator is considered. Capacity improvements with macro-diversity, reception antenna diversity and with interference reduction techniques are analyzed. A cellular system simulator is utilized in assessing the achievable capacity gains with these techniques. Interference reduction can be achieved with, for example, interference canceling or with appropriate spreading code design. Algorithms for canceling interference are not described in this paper nor are antenna hardware requirements considered but the possible capacity gains are evaluated. Urban macro- and micro-cell environments are studied. The intra-cell interference cancellation is found to be important for the macro-cell environment, where as for micro-cell environment macro- or antenna-diversity means are seen as essential