Performance analysis of CDPA: an approach for new cellular access

Abstract

This paper presents a new access method in a cellular environment, known as capture-division packet access, a packet-oriented architecture that overcomes most of the limitations of present cellular systems. The channel reuse of this method is an new alternative compared to TDMA, FDMA and CDMA multiple-access schemes. In CDPA a single frequency channel is used and parallel transmissions are achieved through the "capture" capability of receivers. CDPA integrates the multiple access and channel reuse issues to achieve a high degree of spectral efficiency. It allows each user to access the entire channel, for brief periods of time. Spectrum sharing is done by exploiting the different path losses suffered by the various signals as they appear at the base stations (BS). Packets that are not captured are almost immediately retransmitted. The need for extra radio traffic in handover is eliminated, as CDPA is a connectionless approach with any BS. The CDPA method has been simulated under various system parameters and its performance is analyzed.