Title :
Performance of adaptive modulation techniques in the UMTS system
Author :
Alesiani, Francesco ; Biglieri, Ezio ; Taricco, Giorgio ; Viterbo, Emanuele
Author_Institution :
Dipt. di Elettronica, Politecnico di Torino, Italy
Abstract :
We study the performance of a UNITS downlink, as achieved by a single-user (RAKE) and a multiuser (linear MMSE) receiver with adaptive modulation and multicode in the presence of multipath fading. We advocate an adaptive transmission scheme that varies the number of virtual users and the modulation spectral efficiency in order to optimize the system throughput. Two multipath channel models are considered, exhibiting 3 and 9 paths, respectively. Over the more favorable multipath channel, the multiuser MMSE receiver yields a significant performance enhancement with respect to the RAKE receiver
Keywords :
adaptive modulation; fading channels; least mean squares methods; mobile radio; multipath channels; multiuser channels; optimisation; radio receivers; telecommunication traffic; RAKE receiver; UMTS downlink; adaptive modulation; adaptive transmission; channel models; future-generation mobile systems; linear MMSE receiver; modulation spectral efficiency; multicode; multipath fading; multiuser receiver; performance; single-user receiver; system throughput optimization; virtual users; 3G mobile communication; Channel capacity; Delay; Fading; Multipath channels; Quality of service; RAKE receivers; Rayleigh channels; Throughput; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965691
