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

fYear

2009

fDate

26-29 April 2009

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th

Conference_Location

Barcelona

ISSN

1550-2252

Print_ISBN

978-1-4244-2517-4

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2009.5073629

Filename

5073629