Method and device for removing narrow band interference in spreading frequency system
First Claim
1. A method for eliminating narrow-band interference in a spread spectrum system, comprising the following steps of:
- (A) extracting data of N sampling points to perform frequency spectrum transform each time and obtaining transformed data of N points;
(B) for the N sampling points, getting an energy accumulation of individual data after transform for M times and obtaining N energy values, wherein M is an integer greater than or equal to 1;
(C) removing partial excessive large values from said N energy values and averaging remaining energy values to get an average value, calculating a threshold value for interference determination based on the average value;
(D) comparing said N energy values with the threshold value, and obtaining identification information of all points that have energy values exceeding the threshold value;
(E) based on the identification information of said points, performing interference suppression for the data of corresponding points after frequency spectrum transform, performing frequency spectrum inverse transform for processed data and then outputting;
wherein step (C) is first to sequence said N energy values and remove K largest energy values, and K is computed in one of following methods;
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Abstract
Narrow-band interference in spread spectrum systems is eliminated by performing a frequency spectrum transform on N sampling points of the data to obtain N points of data; after M transforms, getting an energy accumulation of individual data to obtain N energy values; removing partial excessive large values from the N energy values, averaging the rest, then calculating the threshold value for interference determination based on the average value; identifying all points that have energy values exceeding the threshold value, and performing interference suppression for the data of corresponding points after frequency spectrum transform and finally outputting the data after frequency spectrum inverse transform.
11 Citations
16 Claims
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1. A method for eliminating narrow-band interference in a spread spectrum system, comprising the following steps of:
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(A) extracting data of N sampling points to perform frequency spectrum transform each time and obtaining transformed data of N points; (B) for the N sampling points, getting an energy accumulation of individual data after transform for M times and obtaining N energy values, wherein M is an integer greater than or equal to 1; (C) removing partial excessive large values from said N energy values and averaging remaining energy values to get an average value, calculating a threshold value for interference determination based on the average value; (D) comparing said N energy values with the threshold value, and obtaining identification information of all points that have energy values exceeding the threshold value; (E) based on the identification information of said points, performing interference suppression for the data of corresponding points after frequency spectrum transform, performing frequency spectrum inverse transform for processed data and then outputting; wherein step (C) is first to sequence said N energy values and remove K largest energy values, and K is computed in one of following methods; - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for eliminating narrow-band interference in a spread spectrum system, characterized in that it comprises a frequency spectrum transform unit, an interference elimination unit, an interference elimination control unit and a frequency spectrum inverse transform unit, wherein:
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said frequency spectrum transform unit is used to perform frequency spectrum transform for one-time-extracted N sampling points of data and output transformed data to the interference elimination unit and the interference elimination control unit; said interference elimination unit is used to perform interference elimination processing on data of points based on identification information of these points output from the interference elimination control unit and then send processed data to the frequency spectrum inverse transform unit; said frequency spectrum inverse transform unit is used to perform frequency spectrum inverse transform for the data output from the interference elimination unit and then output them; said interference elimination control unit is used to get an energy accumulation of individual data after transform for M times for the N sampling points to obtain N energy values (M≧
1), remove K excessive large values and average remaining energy values to get an average value, compute a threshold value based on the average value and compare the threshold value with the N energy values, and then output the identification information of the points that have energy values exceeding the threshold value to the interference elimination unit;wherein K is computed in one of following methods; - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification