Title :
Unified multiple-access performance analysis of several multi-rate multicarrier spread-spectrum systems
Author :
Nikjah, R. ; Nas-Kenari, M.
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
A unified multiple-access performance analysis and comparison of three multicarrier spread-spectrum multiple-access schemes, namely MC-CDMA (multicarrier code-division multiple-access), MC-FH (multicarrier frequency hopping) and a hybrid of the above systems, called DS-MC-FH (direct-sequence MC-FH), in synchronous and asynchronous multi-rate environments, where each user can have several multi-rate services, in which a maximum-ratio combining (MRC) receiver is provided. Near-far and power-control-error (PCE) effects on the systems´ performances have also been investigated. Our analyses indicate that MC-CDMA systems with Walsh codes outperform the other schemes. DS-MC-FH systems with Walsh codes always surpass MC-FH systems. Furthermore, all of the schemes are susceptible to the near-far effect and PCE with an MRC receiver.
Keywords :
Walsh functions; code division multiple access; frequency hop communication; power control; spread spectrum communication; DS-MC-FH; MC-CDMA; MC-FH; MRC receiver; PCE; Walsh codes; asynchronous multirate environments; direct-sequence MC-FH; maximum-ratio combining receiver; multicarrier code-division multiple-access; multicarrier frequency hopping; multicarrier spread-spectrum multiple-access schemes; multirate services; near-far effects; power-control-error effects; synchronous multirate environments; unified multiple-access performance analysis; Bandwidth; Fading; Frequency division multiplexing; Hafnium; Multiaccess communication; Multicarrier code division multiple access; Neural networks; OFDM; Performance analysis; Spread spectrum communication;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400037
