Frequency offset compensation for communication systems
First Claim
1. A first station comprising:
- (a) a transmitter adapted to transmit, to a second station, signals at a first carrier frequency modulated to represent first data signals; and
(b) a receiver adapted to receive, from the second station, signals at a second carrier frequency modulated by second data signals, and to generate an estimate of the carrier frequency offset between the first station and the second station based on the signals received from the second station,wherein the transmitter is adapted to;
compare the carrier frequency offset estimate to a specified minimum value; and
adjust the first carrier frequency based on the carrier frequency offset estimate only if the carrier frequency offset estimate exceeds the specified minimum value.
9 Assignments
0 Petitions
Accused Products
Abstract
In communications between a pair of stations using modulated carrier signals, a first station estimates the carrier frequency offset with respect to the second station and transmits signals that are responsive to the estimated carrier frequency offset. The first station may adjust the carrier frequency of the signals it transmits in response to the estimated carrier frequency offset, and/or transmit data to the second station representing the estimated carrier frequency offset. The second station adjusts the carrier frequency of the signals it transmits to the first station, and/or compensates for carrier frequency offset in its processing of received signals, in response to estimated carrier frequency offset data received from the first station.
31 Citations
17 Claims
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1. A first station comprising:
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(a) a transmitter adapted to transmit, to a second station, signals at a first carrier frequency modulated to represent first data signals; and (b) a receiver adapted to receive, from the second station, signals at a second carrier frequency modulated by second data signals, and to generate an estimate of the carrier frequency offset between the first station and the second station based on the signals received from the second station, wherein the transmitter is adapted to; compare the carrier frequency offset estimate to a specified minimum value; and adjust the first carrier frequency based on the carrier frequency offset estimate only if the carrier frequency offset estimate exceeds the specified minimum value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a communication system comprising a first station and a second station, the first station having a transmitter adapted to transmit signals to a second station at a first carrier frequency modulated by first data signals and having a receiver adapted to receive signals from the second station at a second carrier frequency modulated by second data signals, a method comprising, at the first station:
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(a) generating, in the receiver, an estimate of the carrier frequency offset between the first station and the second station based on the signals received from the second station; (b) comparing the estimated carrier frequency offset to a specified minimum value; and (c) adjusting the first carrier frequency based on the carrier frequency offset estimate only if the carrier frequency offset estimate exceeds the specified minimum value. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification