Title :
Coherent multicarrier/DS-CDMA and MC-CDMA for broadband packet wireless access
Author :
Abeta, Sadayuki ; Atarashi, Hiroyuki ; Sawahashi, Mamoru ; Adachi, Fumiyuki
Author_Institution :
Wireless Res. Lab., NTT Mobile Commun. Div., Yokosuka, Japan
Abstract :
This paper compares the packet error rate (PER) performance levels of 3 access schemes, i.e., single-carrier (SC)/DS-CDMA, multi-carrier (MC)/DS-CDMA, and MC-CDMA assuming an over 100-MHz bandwidth for broadband packet wireless access. In a broadband propagation channel, severe multipath interference degrades the accuracy of path search and channel estimation for coherent detection. Computer simulation results show that, in the reverse link, SC/DS-CDMA achieves better performance than MC/DS-CDMA because the pilot signal power in one sub-carrier for path search and channel estimation decreases as the number of sub-carriers increases. The superiority of MC-CDMA to MC(SC)/DS-CDMA is demonstrated, and the results show that, in the forward link, frequency Rake diversity with MC-CDMA is more effective than time Rake diversity with DS-CDMA in a broadband multipath fading channel due to a large amount of multipath interference
Keywords :
broadband networks; code division multiple access; diversity reception; error statistics; fading channels; land mobile radio; multipath channels; packet radio networks; radiofrequency interference; spread spectrum communication; 100 MHz; MC-CDMA; MC/DS-CDMA; PER performance; SC/DS-CDMA; broadband multipath fading channel; broadband packet wireless access; broadband propagation channel; channel estimation; coherent detection; forward link; frequency Rake diversity; multi-carrier DS-CDMA; multipath interference; packet error rate performance; path search; pilot signal power; reverse link; severe multipath interference; single-carrier DS-CDMA; sub-carrier; time Rake diversity; Bandwidth; Channel estimation; Computer simulation; Degradation; Error analysis; Fading; Frequency diversity; Interference; Multiaccess communication; Multicarrier code division multiple access;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851606