Reduced complexity multiuser receivers for asynchronous trelliscoded DS-CDMA systems

GRACIELA CORRAL-BRIONES; MARIO R. HUEDA; CARMEN E. RODRIGUEZ

Rhodes, Greece

Conferencia; Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd; 2001

IEEE

Previous works have shown that multiuser receivers with Trellis-Coded Modulation signijicantly improve performance in CDMA transmissions over bandwidth limited A WGN channels [4][5][6]. In [8] a reduced-state multiuser receiver (RSMR) that jointly decodes the trellis code and equalizes the multiuser interference of the channel has been introduced. In this papec the performance of this reducedstate family is studied for a heavily loaded bandwidth limitedcommunication system. Unlike the previous work, we address the performance of RSMR in situations of practical interest such as in high bandwidth eficiency situations andin near-far situations. Simulation results show that performance near the trellis-coded single user bound is achieved with this scheme at a drastically reduced complexity compared with that of the optimal receiver Moreover, we analyze the near-far resistance of RSMR and other suboptimalschemes. Results show that RSMR significantly outperforms previously known suboptimal structures.