Performance of packet data in adaptive processing gain CDMA with correlated interferers and truncated ARQ

Abstract

This paper analyzes an adaptive processing gain based data transmission in cellular CDMA where processing gain is allocated depending on traffic intensity based on a constraint on bit error rate. Truncated automatic repeat request (T-ARQ) is used at link layer to satisfy a prescribed delay constraint. Effects of correlation among signal and interferers are included in the study. The impact of processing gain, number of retransmissions and correlation on throughput, delay and packet loss are studied. A variable packet size scheme is also evaluated to maintain a limit on packet loss associated with truncation. Index Terms-CDMA, truncated ARQ, correlated interferers, where W is the spread bandwidth. The processing gain for all codes are considered to be equal. A user distribution as in [9] with imperfect power control is