Automatic Gain Control Based on Bandwidth and Delay Spread
First Claim
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1. A method of controlling a signal level in a wireless communication circuit said method comprising:
- receiving a signal propagated through a wireless channel;
determining at least one of the bandwidth of the received signal and the delay spread of the wireless channel; and
adjusting a signal level of the received signal by a gain control circuit based on at least one of the bandwidth of the received signal and the delay spread of the wireless channel.
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Abstract
A gain control circuit adjusts the signal level of a received signal responsive to the bandwidth a received signal and/or the delay spread of the channel in which the signal has propagated. The bandwidth and delay spread are evaluated to estimate the amount of signal variation that is expected due to fast fading. Adjustments to the signal level are then made to avoid clipping while at the same time ensuring that the dynamic range of a receiver component is efficiently utilized.
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20 Claims
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1. A method of controlling a signal level in a wireless communication circuit said method comprising:
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receiving a signal propagated through a wireless channel; determining at least one of the bandwidth of the received signal and the delay spread of the wireless channel; and adjusting a signal level of the received signal by a gain control circuit based on at least one of the bandwidth of the received signal and the delay spread of the wireless channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit for controlling a signal level of a received signal, said circuit comprising:
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a processor to determine at least one of a bandwidth of the received signal and delay spread of a wireless channel; and an gain control circuit configured to adjust the signal level of the received signal based on at least one of the bandwidth of the received signal and delay spread of the wireless channel. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless communication receiver, comprising a circuit configured to control a signal level of a received signal, said circuit comprising:
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a processor to determine at least one of a bandwidth of the received signal and delay spread of a wireless channel; and an gain control circuit configured to adjust the signal level of the received signal to vary the headroom of a signal for a receiver circuit based on at least one of the bandwidth of the received signal and delay spread of the wireless channel. - View Dependent Claims (20)
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Specification