Title :
A hybrid multi-rate scheme for WCDMA
Author :
Kim, Seok Ho ; Shin, S.H. ; Kwak, Kyung Sup
Author_Institution :
Sch. of Electr. & Comput. Eng., Inha Univ., Inchon, South Korea
Abstract :
Different kinds of multi-rate communication systems are considered for accommodating information sources with different data rates. Direct-sequence code-division multiple access (DS/CDMA) techniques have attracted much attention for use in such systems. In this paper three multi-rate transmission schemes in a WCDMA system are compared. Both AWGN and multipath Rayleigh fading channels are considered. It is shown that for high data rates the spreading factor in the variable spreading factor scheme will be very small and thus the performance will be significantly degraded due to intersymbol interference. Thus variable spreading factors are used for the low and medium high data rates, and combined with multicode transmission for the highest data rates. Simulation result shows that hybrid multi-rate transmission scheme is suitable for WCDMA
Keywords :
AWGN channels; Rayleigh channels; channel coding; code division multiple access; data communication; intersymbol interference; land mobile radio; multipath channels; radiofrequency interference; spread spectrum communication; AWGN channels; DS/CDMA techniques; WCDMA; data rates; direct-sequence code-division multiple access; high data rates; hybrid multi-rate scheme; intersymbol interference; multi-rate communication systems; multi-rate transmission schemes; multipath Rayleigh fading channels; performance; spreading factor; wireless CDMA; AWGN; Bit rate; Degradation; Error analysis; Fading; Intersymbol interference; Multiaccess communication; Multimedia communication; Multimedia systems; Multipath channels;
Conference_Titel :
TENCON 99. Proceedings of the IEEE Region 10 Conference
Conference_Location :
Cheju Island
Print_ISBN :
0-7803-5739-6
DOI :
10.1109/TENCON.1999.818648
