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| Signal transmission circuit of a wireless telephone handset |
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| Method for selecting cells in multiband system |
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| Visual message waiting indication in a telephone voice message system |
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| System and apparatus for recording and displaying received information at a remote location |
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| Apparatus for providing enhanced addressing capability in voice messaging system networks |
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| Sponsored call and cell service |
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System for canceling internal interference in a receiver
| Details |
Inventors: Domino, William J.; Damgaard, Morten; Agahi-Kesheh, Darioush; Arora, Arvind;
Assignee: Skyworks Solutions, Inc. (Irvine, CA)
Primary Examiner: Chin; Vivian
Assistant Examiner: Pan; Yuwen
Attorney, Agent or Firm: Mintz Levin Cohn Ferris Glovsky & Popeo, P.C.
A system for reducing internal interference in a radio-frequency (RF) receiver includes providing a plurality of time slots within a frame where the receiver is configured to receive external RF signals during a receive time slot within the frame. Data is collected during a receive time slot of a frame, and a receive data value is calculated corresponding to the collected data. A predetermined portion of the data collected is inspected, and a bias data value is calculated. The bias value is attributable to interference signals caused by the internal interference. The bias data value is added to an accumulator, and over time, a running average of the bias data values is determined. A portion of the running average is subtracted from the sample stream of data to provide output data corresponding to the external RF signals absent the internal interference. |
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DETAILED DESCRIPTION FIG.
1 is a specific embodiment of a GSM receiver 10 for use in a GSM communication system.
Note that the inventive system may be used in many types of receivers and is particularly advantageous in TDMA type receivers (e.
g.
, a GSM receiver, IS136 type receiver systems, etc.
).
The GSM receiver 10 includes an antenna 12 for receiving GSM communication signals (radio frequency signals) 14.
The antenna 12 is coupled to a switch 16, which is shown symbolically, for example, as a single-pole single-throw switch.
The switch 16, however, may be for example, a FET (field effect transistor) switch or MOSFET (metal-oxide semiconductor FED) switch, or any suitable device capable of blocking or de-coupling a signal from its source.
The switch 16 is used because the GSM receiver 10 utilizes a single antenna for receiving and transmitting signals.
The switch 16 couples the antenna 12 to a transmitter block 20 or to an RF bandpass filter 22, depending upon its position, such that the GSM receiver 10 can be placed in either a "receive" mode or a "transmit" mode at any particular time.
The filter 22 is coupled via the switch 16 to the antenna 12 when the GSM receiver 10 is in the receive mode of operation.
The transmitter block 20 is shown in block diagram representation only.
The filter 22 filters the RF signals 14 or external signals received on the antenna 12 and passes only a band of frequencies occupied by specific communication channels used for the GSM communication system.
The external signals 14 are typically the communication signals representing voice, data, or other information desired to be transmitted and/or received by a user.
For example, for a typical GSM receiver, the filter 22 may have a pass-band frequency of 935 MHz to 960 MHz, which may provide appropriate bandwidth for 125 individual GSM communication channels or more.
The filter 22 substantially eliminates or reduces interfering signals at frequencies above and below the frequencies used for the 125 GSM communication channels
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