Title :
Space-time receiver for multi-rate CDMA systems: multi-code and variable spreading length access methods comparison
Author :
Ma, Janwen ; Ge, Hongya
Author_Institution :
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
fDate :
6/21/1905 12:00:00 AM
Abstract :
Linear space-time multiuser detectors are proposed for CDMA systems which support users transmitting at different bit rates. The performance of the LMMSE space-time dual-rate receiver is studied in the context of two multi-rate access methods: multi-code (MC) access where high data rate users multiplex information streams onto multiple codes, and variable spreading length (VSL) access where signature sequences of different lengths are assigned to users with different data rates. Simulation results show that the proposed LMMSE space-time dual-rate receiver can significantly enhance the multimedia services that can be provided by multi-rate CDMA systems, and the VSL access system offers a distinct advantage over the MC system
Keywords :
code division multiple access; land mobile radio; least mean squares methods; multimedia communication; multiuser channels; personal communication networks; radio receivers; signal detection; spread spectrum communication; variable length codes; LMMSE space-time dual-rate receiver; bit rates; high data rate; information streams multiplexing; linear space-time multiuser detectors; minimum mean-squared error; mobile telephony; multi-code access method; multi-rate CDMA systems; multi-rate access methods; multimedia services; multiple codes; performance; personal communications; signature sequences; simulation results; variable spreading length access method; Data communication; Detectors; Fading; Multiaccess communication; Multimedia systems; Multipath channels; Multiple access interference; Receiving antennas; Signal processing; Space technology;
Conference_Titel :
Global Telecommunications Conference, 1999. GLOBECOM '99
Conference_Location :
Rio de Janeireo
Print_ISBN :
0-7803-5796-5
DOI :
10.1109/GLOCOM.1999.830233
