Title :
On the Error Floor of MC-CDMA Systems over Rayleigh Fading Channels: Uplink vs. Downlink
Author :
Khalaf, Taha A. ; Zekavat, Seyeda Reza
Author_Institution :
ECE Dept., Iowa State Univ., Ames, IA, USA
Abstract :
The paper studies the error floor performance of uplink and downlink multicarrier code division multiple access (MC-CDMA) over Rayleigh fading channels. Error floor is investigated for MC-CDMA systems with equal gain combiner (EGC) and minimum mean square error combiner (MMSEC). An integrated theoretical-numerical method is proposed to evaluate the error floor for EGC. Curve fitting approach is used to find a closed form expression for the error floor of MMSEC. These closed form expressions help designers to study the impact of error floor in the uplink without running time consuming simulations. The results depict that MC-CDMA performance is highly degraded in the uplink compared to the downlink.
Keywords :
Rayleigh channels; code division multiple access; curve fitting; diversity reception; least mean squares methods; MC-CDMA system; Rayleigh fading channel; curve fitting approach; equal gain combiner; minimum mean square error combiner; multicarrier code division multiple access; uplink-downlink error floor performance; Bit error rate; Curve fitting; Diversity reception; Downlink; Fading; Frequency diversity; Mean square error methods; Multicarrier code division multiple access; Signal to noise ratio; USA Councils; EGC; MC-CDMA; MGF; MMSEC; error floor;
Conference_Titel :
Signal Processing and Communications, 2007. ICSPC 2007. IEEE International Conference on
Conference_Location :
Dubai
Print_ISBN :
978-1-4244-1235-8
Electronic_ISBN :
978-1-4244-1236-5
DOI :
10.1109/ICSPC.2007.4728359
