Title :
Joint Carrier Synchronization and Equalization Algorithm for OFDM Systems -- Closed-Loop Derivation
Author :
Wu, Chih-Feng ; Shiue, Muh-Tian ; Wang, Chorng-Kuang
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
Abstract :
In this paper, the closed-loop derivation of the joint carrier synchronization and equalization algorithm for OFDM systems in the tracking stage are presented using the multirate DPLL and the fictitious sampler techniques. As a result, the carrier synchronization scheme is a dual-loop structure, outer and inner loops, which can be regarded as a proportional and a integral parts of DPLL respectively. Besides, the approximation and the stability of the dual-loop are also presented. On the other hand, the equalization scheme is a first-order closed-loop, based on LMS algorithm, for gain equalization on each subchannel.
Keywords :
OFDM modulation; channel estimation; closed loop systems; digital phase locked loops; least mean squares methods; OFDM systems; closed-loop derivation; equalization algorithm; gain equalization; joint carrier synchronization; multirate DPLL; Cost function; Degradation; Fading; Frequency synchronization; Interference; Least squares approximation; Mean square error methods; OFDM; Stability; System performance;
Conference_Titel :
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-2517-4
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2009.5073629
