System for continuous wave rejection
First Claim
1. A method for receiving transmitted signals in a CDMA communication system having a detection threshold for comparing with a sample of a received signal in order to determine the presence of CW interference in the received signal, comprising the steps of:
- (a) obtaining a first sample of the received signal at a first sample time, the first sample including a calculated correlation value between a first input signal and a locally-generated pseudorandom code;
(b) obtaining a second sample of the received signal at a second sample time, the second sample including a calculated correlation value between a second input signal and a locally-generated pseudorandom code;
(c) comparing the first and second samples in order to provide an input sample comparison;
(d) repeating steps (a)-(c) in order to provide a plurality of input sample comparisons; and
(e) adjusting the detection threshold in response to at least one of said input sample comparisons.
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Abstract
A method for receiving transmitted signals in the presence of CW interference is used in a communication system that determines the presence of a code in a received signal. A detector threshold is compared calculations made in accordance with a sample of a received signal. A first input power value of the received signal is obtained at a first sample time and a second input power value of the received signal is obtained at a second sample time. The first and second power values are compared in order to provide an input sample comparison and the forgoing steps are repeated in order to provide a plurality of input sample comparisons, and the detector threshold is adjusted in accordance with the plurality of sample comparisons. The CW signal can be strongly correlated with a short code used for the acquisition purposes, while avoiding false alarms.
10 Citations
24 Claims
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1. A method for receiving transmitted signals in a CDMA communication system having a detection threshold for comparing with a sample of a received signal in order to determine the presence of CW interference in the received signal, comprising the steps of:
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(a) obtaining a first sample of the received signal at a first sample time, the first sample including a calculated correlation value between a first input signal and a locally-generated pseudorandom code;
(b) obtaining a second sample of the received signal at a second sample time, the second sample including a calculated correlation value between a second input signal and a locally-generated pseudorandom code;
(c) comparing the first and second samples in order to provide an input sample comparison;
(d) repeating steps (a)-(c) in order to provide a plurality of input sample comparisons; and
(e) adjusting the detection threshold in response to at least one of said input sample comparisons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a CDMA communication system, a method of receiving transmitted signals in the presence of CW interference comprising:
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sampling a received signal to generate a plurality of signal samples;
calculating a correlation value between said signal samples and a locally-generated pseudorandom code;
converting each signal sample into a respective power value;
selecting and eliminating a maximum power value from the plurality of power values and said correlation values;
averaging the remaining power values to generate an average power value;
determining an average difference between each power value and the power value of an adjacent sample; and
comparing the average power value to the average difference to adjust a detection threshold in response to said CW interference. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for a user equipment (UE) to receive transmitted signals in a CDMA communication system having a detection threshold for detecting codes in the received signals in the presence of CW interference in the received signal, characterized by the steps of:
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(a) obtaining a first sample of the received signal at a first sample time, the first sample including a calculated correlation value between a first input signal and a locally-generated pseudorandom code;
(b) obtaining a second sample of the received signal at a second sample time, the second sample including a calculated correlation value between a first input signal and a locally-generated pseudorandom code;
(c) comparing the first and second samples in order to provide a first correlation; and
(d) adjusting the detection threshold in response to said first correlation. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification