Title :
ML estimation and correction of frequency offset for MC-CDMA systems over fading channels
Author :
Tian, Qingjiang ; Ben Letaief, Khaled
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
Multi-carrier code division multiple access (MC-CDMA) has been proposed as one of the air interface candidates for the third generation wireless communication systems. However, MC-CDMA systems suffer a lot of performance degradation due to carrier frequency offsets. In this paper, we derive the likelihood function for the carrier frequency offset for MC-CDMA systems for the downlink over Rayleigh flat fading channels. We also propose a gradient algorithm to estimate and minimize the carrier frequency offset in a tracking mode. Simulation results show that system performance can be improved significantly even with only a few iterations
Keywords :
Rayleigh channels; cellular radio; code division multiple access; frequency estimation; gradient methods; maximum likelihood estimation; MC-CDMA systems; ML estimation; Rayleigh flat fading channels; air interface; carrier frequency offsets; downlink; fading channels; frequency offset; gradient algorithm; iteration; likelihood function; multi-carrier code division multiple access; performance degradation; third generation wireless communication systems; tracking mode; Computer interfaces; Degradation; Downlink; Fading; Frequency estimation; Information technology; Maximum likelihood estimation; Multiaccess communication; Multicarrier code division multiple access; System performance;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944907
