Apparatus and method for sampling frequency offset estimation and correction in a wireless communication system
AssigneeBroadcom Corporation
InventorsRohit V. Gaikwad, Rajendra T. Moorti
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Abstract
A method is described for correcting sampling frequency offset (SFO) of a data packet in a communications system where carrier frequency (fc) and sampling frequency (fs) are driven by a common clock source. The method comprises, for each lth symbol in the data packet, estimating carrier frequency offset (CFO) in a received data packet. From the CFO estimate, an SFO estimate is derived, wherein the SFO is approximately equal to fs multiplied by said CFO estimate, and divided by fc. An SFO phase correction is generated according to the SFO estimate for each kth tone in a data stream. The SFO phase correction is then applied to each received data stream.
Claims9
A method for correcting sampling frequency offset (SFO) of a data packet with one or more data streams (M) in a communications system where carrier frequency (fc) and sampling frequency (fs) are driven by a common clock source, the method comprising:
- for each lth symbol in the data packet:
- (a) estimating carrier frequency offset (CFO) in a received data packet;
- (b) deriving a SFO estimate from said CFO estimate, wherein the SFO is approximately equal to fs multiplied by said CFO estimate, and divided by fc;
- (c) generating a SFO phase correction according to said SFO estimate for each kth tone in the data packet;
- and
- (d) applying said SFO phase correction to said one or more data streams.
Dependencies are inferred from the claim text.