Multiuser detection for S‐UMTS and GMR‐1 mobile systems

Abstract

AbstractIn this paper, we dwell on the applicability of successive interference cancellation (SIC) and turbo spatial minimum mean‐squared error joint to parallel interference cancellation (turbo SMMSE‐PIC) to a CDMA and a TDMA mobile satellite system (MSS), i.e. Satellite Universal Mobile Telecommunication System (S‐UMTS) and Geo Mobile Radio (GMR‐1), which provide seamless service and coverage extension to their terrestrial counterparts: UMTS and GSM. The adoption of MUD techniques for the return link of these two systems turns out to be instrumental in achieving the required high spectral efficiency but is also very challenging due to the peculiarities of the MSS environment. The theoretical capacity is computed for the considered scenarios, and is then compared with the system performance in real conditions, considering correlated Rician fading, non‐linear distortion introduced by high‐power amplifiers, and residual parameter estimation errors. Physical layer results are used to perform a link budget study and assess the potential system throughput increase. Our results show that MUD techniques allow to largely increase MSS throughput: in S‐UMTS the gain exceeds 50%, while full frequency reuse can be adopted in GMR‐1, compared with the three or more frequency reuse patterns adopted in currently operating systems. In S‐UMTS, the additional antenna gain in the beam centre is exploited to further boost the achievable capacity. Copyright © 2007 John Wiley & Sons, Ltd.