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| CDMA communications method and system |
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Digital radio frequency interference canceller
| Details |
Inventors: Wiese, Brian R.; Bingham, John A. C.;
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Examiner: Pham; Chi
Assistant Examiner: Al-Beshrawi; Tony
Attorney, Agent or Firm: Hernandez; Pedro P., Brady, III; W. James, Telecky, Jr.; Frederick J.
Disclosed are radio frequency (RF) interference cancellation techniques that effectively estimate RF interference to the data signals being received using a frequency domain model, and then remove the estimated RF interference from the received data signals. Improved techniques for digitally filtering multicarrier modulation samples to reduce sidelobe interference due to the RF interference are also disclosed. |
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DETAILED DESCRIPTION Broadly speaking, the invention pertains to radio frequency (RF) interference cancellation techniques that effectively estimate RF interference to transmitted data signals being received using a frequency domain model for the RF interference, and then remove the estimated RF interference from the received data signals.
The invention also pertains to improved techniques for digitally filtering multicarrier modulation samples to reduce sidelobe interference due to the RF interference.
The invention can be implemented in numerous ways, including as an apparatus, system, method, or computer readable media.
Several embodiments of the invention are discussed below.
As a method for mitigating radio frequency (RF) interference in a multicarrier modulation system, one embodiment of the invention includes the operations of: obtaining frequency domain data associated with a frequency band; identifying a restricted frequency sub-band within the frequency band; estimating a frequency of the RF interference within the restricted frequency sub-band; estimating the RF interference in accordance with a frequency domain model for the RF interference and the estimated frequency of the RF interference; and thereafter removing the estimated RF interference from the frequency domain data.
As a method for mitigating radio frequency interference in a multicarrier modulation system, another embodiment of the invention includes the operations of: identifying AM radio interference to the multicarrier modulation system, estimating a frequency of the AM radio interference, and disabling certain frequency tones of the multicarrier modulation system adjacent to the estimated frequency of the AM radio interference from carrying data during the data transmission, these operations occur prior to data transmission.
Thereafter, during or following data reception, the invention also includes the operations of estimating the AM radio interference in accordance with a frequency domain model for the AM radio interference and the estimated frequency of the AM radio interference, and removing the estimated AIM radio interference from the frequency domain data on those of the frequency tones of the multicarrier modulation system that carry data
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