Space-time UMTS-FDD receiver with weighted interference cancellation

This contribution investigates a space-time multiuser receiver with weighted non-linear parallel interference cancellation for the uplink of UMTS FDD mode. More specifically, we tailor a receiver concept originally proposed by Divsalar et al. to the uplink of UMTS FDD and extend the concept to space-time processing. This receiver consists of several concatenated identical processing stages. The concept turns-out to be well-suited for the uplink which employs long-code CDMA. Our simulations show that this receiver offers a graceful trade-off between computational complexity (expressed in the number of stages) and bit error rate in UMTS. With pilot-based channel estimation, four receive antenna elements, and two receiver stages we obtain an uncoded bit error rate of 4% at an E_b/N₀ of 4dB.