Frequency offset estimation apparatus for intersymbol...

Details Frequency offset estimation apparatus for intersymbol... Frequency offset estimation apparatus for intersymbol...

2006-10-03

2006-10-03

Tran, Khanh Cong (Department: 2611)

Pulse or digital communications

Receivers

Reexamination Certificate

active

07116727

ABSTRACT:
A frequency offset estimation apparatus for intersymbol interference channels. A storage area having M elements is provided to shift a received sample sequence by M samples to generate a lagged sample sequence. A sequence of preliminary values is calculated by differential operation between the received sample sequence and the lagged sample sequence. Next, a summation of the power of the preliminary value sequence over M′ samples is taken to obtain an accumulative sum. Finally, the angle of the accumulative sum is derived and then scaled by a factor. A frequency offset estimate for the received sample sequence is thus obtained.

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patent: 2003/0058966 (2003-03-01), Gilbert et al.
patent: 2003/0147456 (2003-08-01), Kumura
“Simultaneous Clock Phase and Frequency Offset Estimation” K. E. Scott, et al.; IEEE Transactions on Communications; Jul. 1995.
“Fast Frame Synchronization, Frequency Offset Estimation and Channel Acquisition for Spontaneous Transmission Over Unknown Frequency-Selective Radio Channels” S.A. Fechtel, et al.; 1993.
“A Frequency Offset Estimation Technique for Wireless Channels” A. R. S. Bahai, et al.; 1997.
“A Frequency Offset Estimation Technique for Frequency-Selective Fading Channels” H. Viswanathan, et al.; Apr. 2001.

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