Multiplex communications – Generalized orthogonal or special mathematical techniques
Reexamination Certificate
2008-04-29
2008-04-29
Pham, Chi (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
C370S206000, C370S208000, C375S346000
Reexamination Certificate
active
10334353
ABSTRACT:
Provided are delta-predicted frequency offset compensation apparatus and method that estimates an offset delta of forthcoming symbols by using a principle that the offset delta of a symbol in a previous section is almost the same as an offset delta of some forthcoming symbols. The offset compensation method of the present research includes the steps of: a) estimating a frequency offset of a communication system based on an estimation period and estimation algorithm; b) outputting a compensation value for offset compensation through a feedback loop by considering the frequency offset value estimated based on the estimation period and the frequency offset delta estimated based on the estimation period and delay interval; and c) shifting the phase of a signal by as much as the offset corresponding to an input signal of the communication system to compensate the symbol for the frequency offset. The apparatus and method of the present invention can be applied to a communication system using an orthogonal frequency division multiplexing.
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Eum Nak Woong
Kim Jong Dae
Kwark Myung Sin
Lee Ju Hyun
Blakley Sokoloff Taylor & Zafman LLP
Electronics and Telecommunications Research Institute
Pham Chi
Phan Tri H.
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