Receiver gain control using a pilot signal
AssigneeCisco Technology, Inc.
InventorHang Jin
Life of this patent
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Abstract
A method and system is disclosed for perform receiver gain control. A pilot signal is transmitted prior to each transmit period to facilitate an initial gain setting for a corresponding receiver period. This pilot signal has known properties and requires a much smaller receiver dynamic range than the rest of the traffic. An initial gain setting is derived based on the pilot signal received at a beginning of a corresponding receive period. A gain setting for traffic signals is then generated following the pilot signal in the receive period based on the initial gain setting.
Claims19
A method for adjusting a gain setting in a telecommunication system comprising:
- at a first device, generating a pilot signal that has a dynamic range much smaller than a dynamic range associated with traffic signals to be transmitted from the first device to a second device;
- transmitting the pilot signal from the first device to the second device preceding each transmit period during which traffic signals are transmitted from the first device to the second device;
- receiving the pilot signal at the second device prior to a receive period that corresponds to the transmit period and during which receive period the second device receives traffic that is transmitted from the first device;
- deriving an initial gain setting associated with a receiver at the second device based on the pilot signal and on the basis of a gain setting computed at a most recent receive period, a first gain adjustment representing a difference between a desired reference received signal strength (RSS) of the pilot signal and a desired reference RSS of the traffic signals, and a second gain adjustment representing a profile difference between the pilot signal and the traffic signals of the most recent receive period;
- and
- generating a gain setting for use by the receiver when receiving the traffic signals based on the initial gain setting.
A system comprising:
- a first device that comprises a transmitter circuit configured to transmit a pilot signal that has a dynamic range much smaller than a dynamic range associated with traffic signals, wherein the transmitter is configured to transmit the traffic signals during a transmit period and to transmit the pilot signals preceding each transmit period;
- and
- a second device that comprises a receiver circuit that is configured to receive the traffic signals during a receive period that corresponds to the transmit period and to receive the pilot signal prior to each receive period, wherein the second device is configured to derive an initial gain setting associated with the receiver circuit based on the pilot signal using a gain setting computed at a most recent receive period, a first gain adjustment representing a difference between a desired reference received signal strength (RSS) of the pilot signal and a desired reference RSS of traffic signals, and a second gain adjustment representing a profile difference between the pilot signal and the traffic signals associated with the most recent receive period, and wherein the second device is further configured to generate a gain setting when receiving traffic signals based on the initial gain setting.
Dependencies are inferred from the claim text.