 Delay line time compression correlation circuit |
| OF THE DISCLOSURE FIG. 1 is a schematic representation of a control counter 10 which provides the S... |
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| Equalizer and equalizing circuit using the same |
| Therefore, an object of the present invention is to provide an equalizing circuit which can be ... |
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| Loran-C signal processor |
| FIG. 1 shows the detailed block diagram of my novel signal processor 10. The signal waveform input ... |
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| CDMA communications method and system |
| It is therefore an object of the present invention to provide a CDMA communications method and ... |
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| Automatic power control system for a code division multiple access (CDMA) communications system |
| The present invention includes a system and method for closed loop automatic power control (APC) ... |
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| Impulse autocorrelation function communications system |
| I claim: 1. A bi-orthogonal pulse code modulation communication system, comprising: means for ... |
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| Pickup device for disc player |
| With the above deficiencies of the prior art in view, it is an object of this invention to provide ... |
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| Spread spectrum receiving device |
| In order to achieve the above object, according to the present invention, in a spread spectrum ... |
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| Mobile radio communications system |
| This invention is a mobile radio communications system which has radio base stations that are ... |
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| Device for measuring the average value of pulse signals |
| OF THE PRESENT FIG. 5 illustrates an embodiment of the present invention, in which the parts ... |
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Digital radio frequency interference canceller
| Details |
Inventors: Wiese, Brian R.; Bingham, John A. C.;
Assignee: Amati Communications Corporation (San Jose, CA)
Primary Examiner: Tse; Young T.
Assistant Examiner:
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 frequency domain model for the AM radio interference and the estimated frequency of the AM radio interference, and removing the estimated AM 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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Multiplexer-related 
