A HIGH-ORDER-MODULATION SPACE-TIME RECEIVER WITH INCREASED PEAK RATE AND THROUGHPUT FOR WIDEBAND CDMA

In this work, we significantly increase the peak rate of the wideband CDMA spatio-temporal array-receiver (STAR) by enabling its operation with high-order modulations (HOM) up to 256QAM (i.e., peak rate of 768 Kb/s per spreading code with 32 spreading factor and 1/2 coding rate in 5 MHz). In order to allow an effective rate control for adaptive modulation and maximize throughput with the resulting HOM-STAR, we propose the use of power control (PC) jointly with new rate allocation schemes (RAS). At a load of 20 users per cell or sector, simulations suggest that HOM-STAR with the new RAS can deliver an average throughput per user of 120-140 Kb/s, i.e., an increase of about 100 % over conventional RAS. 1