Detecting channel impulse magnitude response in digital communication systems
View Patent ↗A system and method of detecting the location and magnitude of multi-path echoes in a channel impulse response by going through the channel impulse magnitude response only once and detecting all the multi-path echoes, both location and magnitude, according to certain threshold criteria. The impulse magnitude response samples are processed on-the-fly (on demand) and do not require the storage of the entire channel impulse magnitude response which makes it ideal for ASIC implementation.
1. A method of detecting a channel impulse magnitude response in a digital communication system, said method comprising:
(a) providing a data set of at least one channel impulse magnitude response component and a plurality of noise response components by a processor, wherein said data set comprises a plurality of data points each corresponding to a magnitude response;
(b) calculating an average magnitude response of all components in said data set by a calculator;
(c) comparing a data point corresponding to a magnitude response in said data set with an immediately preceding data point corresponding to an immediately preceding magnitude response in said data set;
(d) comparing said data point corresponding to said magnitude response in said data set with an immediately subsequent data point corresponding to an immediately subsequent magnitude response in said data set;
(e) establishing a first data subset adjacent to said data point, said first data subset comprising a plurality of immediately preceding data points corresponding to a plurality of immediately preceding magnitude responses;
(f) establishing a second data subset adjacent to said data point, said second data subset comprising a plurality of immediately subsequent data points corresponding to a plurality of immediately subsequent magnitude responses;
(g) comparing said data point to an average magnitude response of said first data subset and an average magnitude response of said second data subset; and
(h) classifying said data point as a non-noise channel impulse magnitude response in said digital communication system when said magnitude response of said data point is greater than (i) said average magnitude response of all components in said data set; and (ii) the average magnitude responses of the first and second data subsets.
2. The method of claim 1 , further comprising performing steps (a) through (h) for all data points in said data set.
3. The method of claim 2 , further comprising conducting the performing process exactly once for a given data set of at least one channel impulse magnitude response in said data set.
4. The method of claim 1 , wherein said digital communication system comprises any of a digital terrestrial television (DTV) system, a digital video broadcasting over handheld (DVB-H) system, and an Integrated Services Digital Broadcasting (ISDB) for Terrestrial Television/Sound Broadcasting (ISDB-T/ISDB-T SB ) system.
5. The method of claim 1 , wherein said channel impulse magnitude response comprises a harmonic component in any of a signal spectrum and a power spectrum density distribution.
6. The method of claim 1 , wherein said data point corresponding to said non-noise channel impulse magnitude response comprises a multi-path echo in said digital communication system.
7. The method of claim 1 , wherein the classifying process comprises determining a location and magnitude of said data point corresponding to said non-noise channel impulse magnitude response.
8. A non-transitory computer readable program storage device embodying a program of instructions executable by a machine to perform a method of detecting a channel impulse magnitude response in a digital communication system, said method comprising:
(a) providing a data set of at least one channel impulse magnitude response component and a plurality of noise response components by a processor, wherein said data set comprises a plurality of data points each corresponding to a magnitude response;
(b) calculating an average magnitude response of all components in said data set by a calculator;
(c) comparing a data point corresponding to a magnitude response in said data set with an immediately preceding data point corresponding to an immediately preceding magnitude response in said data set;
(d) comparing said data point corresponding to said magnitude response in said data set with an immediately subsequent data point corresponding to an immediately subsequent magnitude response in said data set;
(e) establishing a first data subset adjacent to said data point, said first data subset comprising a plurality of immediately preceding data points corresponding to a plurality of immediately preceding magnitude responses;
(f) establishing a second data subset adjacent to said data point, said second data subset comprising a plurality of immediately subsequent data points corresponding to a plurality of immediately subsequent magnitude responses;
(g) comparing said data point to an average magnitude response of said first data subset and an average magnitude response of said second data subset; and
(h) classifying said data point as a non-noise channel impulse magnitude response in said digital communication system when said magnitude response of said data point is greater than (i) said average magnitude response of all components in said data set; and (ii) the average magnitude responses of the first and second data subsets.
9. The device of claim 8 , wherein said method further comprises performing steps (a) through (h) for all data points in said data set.
10. The device of claim 9 , wherein said method further comprises conducting the performing process exactly once for a given data set of at least one channel impulse magnitude response in said data set.
11. The device of claim 8 , wherein said digital communication system comprises any of a digital terrestrial television (DTV) system, a digital video broadcasting over handheld (DVB-H) system, and an Integrated Services Digital Broadcasting (ISDB) for Terrestrial Television/Sound Broadcasting (ISDB-T/ISDB-T SB ) system.
12. The device of claim 8 , wherein said channel impulse magnitude response comprises a harmonic component in any of a signal spectrum and a power spectrum density distribution.
13. The device of claim 8 , wherein said data point corresponding to said non-noise channel impulse magnitude response comprises a multi-path echo in said digital communication system.
14. The device of claim 8 , wherein in said method, the classifying process comprises determining a location and magnitude of said data point corresponding to said non-noise channel impulse magnitude response.
15. A system of detecting a channel impulse magnitude response in a digital communication system, said system comprising:
a first processor adapted to provide a data set of at least one channel impulse magnitude response component and a plurality of noise response components, wherein said data set comprises a plurality of data points each corresponding to a magnitude response;
a calculator adapted to calculate an average magnitude response of all components in said data set;
a first comparator adapted to:
compare a data point corresponding to a magnitude response in said data set with an immediately preceding data point corresponding to an immediately preceding magnitude response in said data set; and
compare said data point corresponding to said magnitude response in said data set with an immediately subsequent data point corresponding to an immediately subsequent magnitude response in said data set;
a second processor adapted to:
establish a first data subset adjacent to said data point, said first data subset comprising a plurality of immediately preceding data points corresponding to a plurality of immediately preceding magnitude responses; and
establish a second data subset adjacent to said data point, said second data subset comprising a plurality of immediately subsequent data points corresponding to a plurality of immediately subsequent magnitude responses;
a second comparator adapted to compare said data point to an average magnitude response of said first data subset and an average magnitude response of said second data subset; and
a classifier adapted to classify said data point as a non-noise channel impulse magnitude response in said digital communication system when said magnitude response of said data point is greater than (i) said average magnitude response of all components in said data set; and (ii) the average magnitude responses of the first and second data subsets.
16. The system of claim 15 , wherein said classifier is further adapted to classify all data points in said data set as either a non-noise channel impulse magnitude response or a noise response in said digital communication system.
17. The system of claim 15 , wherein said digital communication system comprises any of a digital terrestrial television (DTV) system, a digital video broadcasting over handheld (DVB-H) system, and an Integrated Services Digital Broadcasting (ISDB) for Terrestrial Television/Sound Broadcasting (ISDB-T/ISDB-T SB ) system.
18. The system of claim 15 , wherein said channel impulse magnitude response comprises a harmonic component in any of a signal spectrum and a power spectrum density distribution.
19. The system of claim 15 , wherein said data point corresponding to said non-noise channel impulse magnitude response comprises a multi-path echo in said digital communication system.
20. The system of claim 15 , wherein said classifier is further adapted to determine a location and magnitude of said data point corresponding to said non-noise channel impulse magnitude response.