Interference reduction using an adaptive receiver filter, signal strength, and BER sensing
AssigneeMotorola, Inc.
InventorStephen V. Cahill
Life of this patent
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Abstract
A radio receiver having a variable bandwidth received channel filter (113,115) to reduce interference is disclosed. A interference is detected by comparing received signal strength and received signal BER. The bandwidth of the filter (113,115) is narrowed to improve BER when a received signal strength is greater than a threshhold value and BER is worse than a threshhold value.
Claims5
A radio receiver having a variable bandwidth received channel filter to pass a desired signal having a plurality of time slots and reject an undesired signal, the radio receiver comprising:
- means for producing a first signal having a value related to the signal strength of the desired signal received by the receiver;
- means for determining a bit error rate of the desired signal during a first one of the plurality of time slots;
- means for comparing said first signal value to a predetermined threshold value and for comparing said determined bit error rate to a predetermined bit error rate and for producing an output signal when said first signal value crosses said predetermined threshold value and said determined bit error rate exceeds said predetermined bit error rate;
- and
- means, responsive to said output signal, for adjusting the bandwidth of the variable bandwidth received channel selectivity filter for passage of a second one of the plurality of time slots.
A method of reducing adjacent channel interference in a radio receiver having a variable bandwidth received channel filter to pass a desired signal having a plurality of time slots and to reject an undesired signal, comprising the steps of:
- producing a first signal having a value related to the signal strength of the desired signal received by the receiver;
- determining a bit error rate of the desired signal during a first one of the plurality of time slots;
- comparing said first signal value to a predetermined threshold value;
- comparing said determined bit error rate to a predetermined bit error rate;
- producing an output signal when said first signal value crosses said predetermined threshold value and said determined bit error rate exceeds said predetermined bit error rate;
- and
- adjusting the bandwidth of the variable bandwidth received channel selectivity filter for passage of a second one of the plurality of time slots in response to said output signal.
Dependencies are inferred from the claim text.