Performance of adaptive modulation techniques in the UMTS system

Francesco Alesiani, Ezio Biglieri, Giorgio Taricco, Emanuele Viterbo

Research output: Contribution to conferencePaper

2 Citations (Scopus)


We study the performance of a UMTS 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.

Original languageEnglish
Number of pages5
Publication statusPublished - 1 Dec 2001
Externally publishedYes
EventIEEE Global Telecommunications Conference 2001 - San Antonio, United States of America
Duration: 25 Nov 200129 Nov 2001 (Proceedings)


ConferenceIEEE Global Telecommunications Conference 2001
Abbreviated titleIEEE GLOBECOM 2001
CountryUnited States of America
CitySan Antonio
Internet address

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