Title :
Performance of EM-based multiuser detection for space-time block coded WCDMA systems over multipath fading channels
Author :
Iraji, Sassan ; Lilleberg, Jorma
Author_Institution :
Nokia Mobile Phones, Oulu, Finland
Abstract :
We present a multiuser detection (MUD) scheme derived from the expectation maximization (EM) algorithm for the downlink of space-time block coded (STBC) WCDMA systems. We consider the downlink scenario with two transmit antennas and a single receive antenna and multipath fading channels. The EM-based MUD looks iteratively for the maximum-likelihood solution. Its structure is very similar to the parallel interference cancellation (PIC) receiver but with better convergence properties. Our simulation results show significant performance gains over conventional and PIC receivers.
Keywords :
Rayleigh channels; block codes; code division multiple access; convergence of numerical methods; interference suppression; iterative methods; maximum likelihood detection; multipath channels; multiuser detection; optimisation; radio receivers; space-time codes; EM algorithm; PIC receiver; Rayleigh channels; W-CDMA; WCDMA; convergence properties; expectation-maximization algorithm; fading channels; maximum-likelihood solution; multipath channels; multiuser detection; parallel interference cancellation receiver; space-time block codes; space-time codes; Downlink; Fading; Interference cancellation; Iterative algorithms; Maximum likelihood detection; Multiaccess communication; Multiuser detection; Performance gain; Receiving antennas; Transmitting antennas;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2002 IEEE Seventh International Symposium on
Print_ISBN :
0-7803-7627-7
DOI :
10.1109/ISSSTA.2002.1049351
