IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0812260
(2001-03-19)
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발명자
/ 주소 |
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| 출원인 / 주소 |
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
116 인용 특허 :
2 |
초록
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An adaptive control system for controlling the effects of narrow to medium bandwidth interferers in a wireless communications system (e.g., wireless LAN devices) by identifying which sub-carriers in a multi-carrier system are located on frequencies that are subject to interfering signals, and using
An adaptive control system for controlling the effects of narrow to medium bandwidth interferers in a wireless communications system (e.g., wireless LAN devices) by identifying which sub-carriers in a multi-carrier system are located on frequencies that are subject to interfering signals, and using only those sub-carriers that are not subject to interference for communications between wireless communications devices.
대표청구항
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1. A method for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the method comprising the steps of:determining at a first communication device sub-carrier frequencies su
1. A method for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the method comprising the steps of:determining at a first communication device sub-carrier frequencies suitable for communication with the first communication device through testing for interference by sampling a radio frequency channel;transmitting data from the first communication device to at least a second communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first communication device;determining at a second communication device sub-carrier frequencies suitable for communication with the second communication device through testing for interference by sampling the radio frequency channel; andtransmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices.2. A method according to claim 1, wherein said method further comprises:commencing data communication from the first communication device to at least the second communication device using the sub-carrier frequencies, in accordance with the data received from the second communication devices.3. A method according to claim 1, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first communication device includes a bitmap.4. A method according to claim 1, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices includes a bitmap.5. A method according to claim 1, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first communication device is transmitted redundantly to the second communication device using a plurality of sub-carriers.6. A method according to claim 1, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices is transmitted redundantly to the first communication device using a plurality of su-carriers.7. A method according to claim 1, wherein said step of determining at a first communication device sub-carrier frequencies suitable for communication with the first communication device, includes spectrum analysis to evaluate energy levels.8. A method according to claim 1, wherein said step of determining at a second communication device sub-carrier frequencies suitable for communication with the second communication device, includes spectrum analysis to evaluate energy levels.9. A method according to claim 1, wherein said multi-carrier modulation technique uses sub-carriers which are orthogonal to each other.10. A method according to claim 1, wherein said step of transmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices, includes the step of transmitting an acknowledge signal to indicate sub-carrier frequencies suitable for data communication with the first and second communication devices.11. A system for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the system comprising:means for determining at a first communication device sub-carrier frequencies suitable for communication with the first communication device through testing for interference by sampling a radio frequency channel;means for transmitting data from the first communication device to at least a second communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first communication device;means for determining at a second communication device sub-carrier frequencies suitable for communication with the second communication device through testing for interference by sampling the radio frequency channel; andmeans for transmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices.12. A system according to claim 11, wherein said system further comprises:means for commencing data communication from the first communication device to at least the second communication device using the sub-carrier frequencies, in accordance with the data received from the second communication device.13. A system according to claim 11, wherein said data indicative of sub-carrier frequencies suitable for data communication with the fist communication device includes a bitmap.14. A system according to claim 11, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices includes a bitmap.15. A system according to claim 11, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first communication device is transmitted redundantly to the second communication device using a plurality of sub-carriers.16. A system according to claim 11, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices is transmitted redundantly to the first communication device using a plurality of sub-carriers.17. A system according to claim 11, wherein said means for determining at a first communication device sub-carrier frequencies suitable for communication with the first communication device, includes means for performing a spectrum analysis to evaluate energy levels.18. A system according to claim 11, wherein said means for determining at a second communication device sub-carrier frequencies suitable for communication with the second communication device, includes means for performing spectrum analysis to evaluate energy levels.19. A system according to claim 11, wherein said multi-carrier modulation technique uses sub-carriers which are orthogonal to each other.20. A system according to claim 11, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices is an acknowledge signal.21. A system for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the system comprising:a first receiver for receiving communication at a first communication device;a first signal processor for determining at the first communication device sub-carrier frequencies suitable for communication with the first communication device;the first receiver and the first processor configured for determining sub-carrier frequencies suitable for communication with the first communication device through testing for interference by sampling a radio frequency channel;a first transmitter for transmitting data from the first communication device to at least a second communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first communication device;a second receiver for receiving communications at a second communication device;a second signal processor for determining at the second communication device sub-carrier frequencies suitable for communication with the second communication device;the second receiver and the second processor configured for determining sub-carrier frequencies suitable for communication with the second communication device through testing for interference by sampling the radio frequency channel; anda second transmitter for transmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices.22. A system according to claim 21, wherein the first transmitter commences data communication from the first communication device to at least the second communication device using the sub-carrier frequencies, in accordance with the data received from the second communication device.23. A system according to claim 21, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first communication device includes a bitmap.24. A system according to claim 21, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices includes a bitmap.25. A system according to claim 21, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first communication device is transmitted redundantly to the second communication device using a plurality of sub-carriers.26. A system according to claim 21, wherein said data indicative of sub-carrier frequencies suitable for data communication with the first and second communication devices is transmitted redundantly to the first communication device using a plurality of sub-carriers.27. A system according to claim 21, wherein said system further comprises a first spectrum analyzer to evaluate energy levels at the first communication device.28. A system according to claim 21, wherein said system further comprises a second spectrum analyzer to evaluate energy levels at the second communication device.29. A system according to claim 21, wherein said multi-carrier modulation technique uses sub-carriers which are orthogonal to each other.30. A system according to claim 21, wherein said second transmitter transmits an acknowledge signal to indicate sub-carrier frequencies suitable for data communication with the first and second communication devices.31. A method for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the method comprising the steps of:determining at a first communication device sub-carrier frequencies suitable for communication with the first communication device through testing for interference by sampling a radio frequency channel; andtransmitting data from the first communication device to at least a second communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first communication device.32. The method of claim 31, the determining step further comprising:converting sampled data to the frequency domain; andevaluating energy levels of each sub-carrier frequency;wherein any sub-carrier frequency having an energy level above a predetermined threshold is determined to be an unusable frequency.33. A method for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the method comprising the steps of:receiving data at a second communication device, wherein said data is indicative of sub-carrier frequencies suitable for data communication with at least a first communication device;determining at the second communication device sub-carrier frequencies suitable for communication with the second communication device through testing for interference by sampling a radio frequency channel; andtransmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with at least the first and second communication devices.34. A method according to claim 33, wherein said method further comprises:commencing data communication from the first communication device to at least the second communication device using the sub-carrier frequencies, in accordance with the data received from the second communication device.35. A system for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the system comprising:means for determining at a first communication device sub-carrier frequencies suitable for communication with the first communication device through testing for interference by sampling a radio frequency channel; andmeans for transmitting data from the first communication device to at least a second communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first communication device.36. A system for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the system comprising:means for receiving data at a second communication device, wherein said data is indicative of sub-carrier frequencies suitable for data communication with at least a first communication device;means for determining at the second communication device sub-carrier frequencies suitable for communication with the second communication device through testing for interference by sampling a radio frequency channel; andmeans for transmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with at least the first and second communication devices.37. A system according to claim 36, wherein said system further comprises:means for commencing data communication from the first communication device to at least the second communication device using the sub-carrier frequencies, in accordance with the data received from the second communication device.38. A system for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the system comprising:a first receiver for receiving communication at a first communication device;a first signal processor for determining at the first communication device sub-carrier frequencies suitable for communication with the first communication device through testing for interference by sampling a radio frequency channel; anda first transmitter for transmitting data from the first communication device to at least a second communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with the first communication device.39. A system according to claim 38, wherein said system further comprises:a second receiver for receiving communications at a second communication device;a second signal processor for determining at the second communication device sub-carrier frequencies suitable for communication with the second communication device; anda second transmitter for transmitting data from the second communication device to at least the first communication device indicative of sub-carrier frequencies suitable for data communication with at least the first and second communication devices.40. A system for selecting sub-carrier frequencies for communication between at least two communication devices using a multi-carrier modulation technique with associated sub-carrier frequencies, the system comprising:a second receiver for receiving communications at a second communication device, wherein said communication includes data indicative of sub-carrier frequencies suitable for data communication with at least a first communication device;a second signal processor for determining at the second communication device sub-carrier frequencies suitable for communication with the second communication device through testing for interference by sampling a radio frequency channel; anda second transmitter for transmitting data from the second communication device to at least the first communication device wherein the data is indicative of sub-carrier frequencies suitable for data communication with at least the first and second communication devices.
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