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Apparatus and method for compensating for frequency offset in a mobile communication system
| Details |
Inventors: Choi, Pil-Soon; Son, Mi-Hyun; Lee, Seong-Soo; Lee, Kwy-Ro;
Assignee: Samsung Electronics Co., Ltd. (KR) Korea Advanced Institute of Science and Technology (KAIST) (KR)
Primary Examiner: Vuong; Quochien B.
Assistant Examiner:
Attorney, Agent or Firm: Dilworth & Barrese, LLP
An apparatus and method for compensating for the frequency offset of a received signal in a receiving apparatus of a mobile communication system. In the present invention, a sine component is calculated by adding I and Q channel signals resulting from downconverting a training sequence inserted between data symbols, and a cosine component is calculated by subtracting the Q channel signal from the I channel signal. Using the cosine and sine components at two time points, tangent components for the two time points are computed and thus first and second phase values are obtained. The frequency offset is estimated by determining the slope of a second-order line derived from the first and second phase values. The frequency offset of the received signal is compensated for based on the estimated frequency offset. |
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DETAILED DESCRIPTION An object of the present invention is to substantially solve at least the above problems and/or disadvantages and to provide at least the advantages below.
Accordingly, an object of the present invention is to provide an apparatus and method for estimating a frequency offset from a received signal and compensating for the frequency offset of the received signal.
Another object of the present invention is to provide an apparatus and method for compensating for the frequency offset of a received signal by estimating the frequency offset using two channel signals having a predetermined phase difference.
A further object of the present invention is to provide an apparatus and method for compensating for the frequency offset of a received signal by performing a simple computation on an estimated frequency offset, stored in a memory, and a received signal.
Still another object of the present invention is to provide an apparatus and method for estimating a frequency offset by means of a training sequence having a known amplitude, and compensating for the frequency offset of a received signal based on the estimated frequency offset.
The above objects are achieved by providing an apparatus and method for compensating for the frequency offset of a received signal in a receiving apparatus of a mobile communication system.
According to one aspect of the present invention, an apparatus for estimating a frequency offset to compensate for the frequency offset of the I and Q channel signals, in a receiving apparatus of a mobile communication system, said receiving apparatus for receiving a signal containing training symbols of a predetermined pattern inserted in a data symbol sequence, downconverting the received signal by a predetermined carrier frequency, and outputting in-phase (I channel) and quadrature-phase (Q channel) signals includes an adder, a subtractor, and a frequency offset estimator.
The adder adds I and Q channel training signals and outputs a sum channel signal containing one of a cosine component or a sine component
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