Throughput Analysis of DS-CDMA Wireless Packet Access using Frequency-Domain Equalization and Random TPC

Recently, we proposed a random transmit power control (TPC) to increase the uplink capacity of DS-CDMA wireless packet access using Rake combining. Furthermore, we evaluated the combined effect of random TPC and inter-path interference (IPI) cancellation and showed that a significant throughput improvement can be achieved if the IPI is sufficiently suppressed. Frequency-domain equalization (FDE) is a promising technique to suppress the IPI. In this paper, we derive an expression for the received signal-to-interference plus noise power ratio (SINR) for a DS-CDMA wireless packet access using FDE and random TPC. Using the derived SINR expression, we evaluate its throughput performance by numerical computation. We compare the throughput using Rake combining with that using FDE to discuss the IPI suppression effect of FDE. It is shown that the throughput using MMSE-FDE approaches that achievable using rake combining w/perfect IC.