Method and apparatus for reducing RF filter induced distortion in a wide bandwidth wireless system by the use of channel-dependent RF filter compensation
First Claim
1. A mobile station comprising:
- a transceiver comprising a transmitter circuit having a transmit RF filter that passes a transmit band of frequencies that is partitioned into transmit frequency channels and a receiver circuit having a receiver RF filter that passes a receive band of frequencies that is partitioned into receiver frequency channels, wherein the transmit band of frequencies comprises at least one first end channel, at least one second end channel, and interior channels between the first and second end channels, wherein the receive band of frequencies comprises at least one first end channel, at least one second end channel, and interior channels between the at least one first and second end channels; and
baseband circuitry capable of compensating for a non-ideal RF operation of channels from the transmit and receive bands of frequencies, the baseband circuitry arranged to compensate for the non-ideal operation of said RF filters of at least one of the at least one first and second end channels of the transmit and receive bands of frequencies and arranged to not compensate for the non-ideal RF operation of said RF filters of any of the interior channels of the transmit and receive bands of frequencies.
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Accused Products
Abstract
A mobile station is constructed to include a transceiver comprising a transmitter circuit having a transmit RF filter that passes a transmit band of frequencies that is partitioned into transmit frequency channels and a receiver circuit having a receiver RF filter that passes a receive band of frequencies that is partitioned into receiver frequency channels. Also included is an antenna coupled through a duplexer to an output of the transmitter circuit and to an input of the receiver circuit. The mobile station further includes circuitry, responsive to a currently selected RF channel, for compensating for a non-ideal operation of the RF filters and the duplexer over a full bandwidth range of the transmit and receive frequencies. The compensating circuitry compensates for RF filter operation in a transmit RF channel that is nearest to the band of receive RF frequencies and/or compensates for RF filter operation in a receive RF channel that is nearest to the band of transmit RF frequencies. The compensation circuitry can be implemented using a digital signal processor (DSP) device or a finite impulse response (FIR) device. In the preferred embodiment the transmit and the receive ranges of frequencies are each about 60 MHz and are each partitioned into 12 frequency channels, and a highest frequency channel in the transmit range of frequencies and a lowest frequency channel in the receive range of frequencies are separated by about 20 MHz.
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Citations
30 Claims
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1. A mobile station comprising:
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a transceiver comprising a transmitter circuit having a transmit RF filter that passes a transmit band of frequencies that is partitioned into transmit frequency channels and a receiver circuit having a receiver RF filter that passes a receive band of frequencies that is partitioned into receiver frequency channels, wherein the transmit band of frequencies comprises at least one first end channel, at least one second end channel, and interior channels between the first and second end channels, wherein the receive band of frequencies comprises at least one first end channel, at least one second end channel, and interior channels between the at least one first and second end channels; and baseband circuitry capable of compensating for a non-ideal RF operation of channels from the transmit and receive bands of frequencies, the baseband circuitry arranged to compensate for the non-ideal operation of said RF filters of at least one of the at least one first and second end channels of the transmit and receive bands of frequencies and arranged to not compensate for the non-ideal RF operation of said RF filters of any of the interior channels of the transmit and receive bands of frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 30)
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8. A method for operating a mobile station comprising:
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providing the mobile station with a transceiver having a transmitter circuit having a transmit RF filter that passes a transmit band of frequencies that is partitioned into transmit frequency channels and a receiver circuit having a receiver RF filter that passes a receive band of frequencies that is partitioned into receiver frequency channels, wherein the transmit band of frequencies comprises at least one first end channel, at least one second end channel, and interior channels between the at least one first and second end channels, wherein the receive band of frequencies comprises at least one first end channel, at least one second end channel, and interior channels between the first and second end channels; and compensating, in a baseband with the capability of compensating non-ideal RF filter operation for both RF receive and transmit channels, the non-ideal operation of said RF filters is provided for at least one of the at least one first and second end channels of the transmit and receive bands of frequencies when the at least one of the at least one first and second end channels is selected and for not compensating the non-ideal operation of said RF filters of the interior channels of the transmit and receive bands of frequencies when one of the interior channels is selected. - View Dependent Claims (9, 10, 11, 12, 13, 14, 21)
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- 15. A circuit comprising means for coupling to a transceiver having a transmitter circuit comprising at least one transmit radio frequency (RF) filter that passes a transmit band of radio frequencies that is partitioned into transmit RF channels and a receiver circuit having at least one receiver RF filter that passes a receive band of radio frequencies that is partitioned into receive RF channels, wherein the transmit RF channels comprise at least one first end channel, at least one second end channel, and interior channels between the first and second end channels, wherein the receive RF channels comprise at least one first end channel, at least one second end channel, and interior channels between the at least one first and second end channels, and means for compensating, in a baseband, for at least one of the first and second end channels of the transmit and receive RF channels when the at least one of the at least one first and second end channels is selected and for not compensating for the non-ideal operation of said RF filters of the interior channels of the transmit and receive RF channels when one of the interior channels is selected, wherein the circuitry is capable for compensating for the non-ideal RF operation of channels from the transmit and receive bands of frequencies.
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22. A mobile station comprising:
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a transceiver comprising a transmitter circuit having a transmit RF filter that passes a transmit band of frequencies that is partitioned into transmit frequency channels and a receiver circuit having a receiver RF filter that passes a receive band of frequencies that is partitioned into receiver frequency channels, wherein the transmit RF channels comprise at least one first end channel, at least one second end channel, and interior channels between the first and second end channels, wherein the receive RF channels comprise at least one first end channel, at least one second end channel, and interior channels between the at least one first and second end channels; and baseband circuitry capable of compensating for a non-ideal RF operation of transmit frequency channels and receive frequency channels, wherein the non-ideal RF filter operation is compensated for one of the at least one first and second end channels of the transmit and receive bands of frequencies when selected and the non-ideal RF operation is not compensated for any of the interior channels of the transmit and receive bands of frequencies when selected. - View Dependent Claims (23, 24)
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- 25. A circuit comprising a circuit portion for coupling to a transceiver having a transmitter circuit comprising at least one transmit radio frequency (RF) filter that passes a transmit band of radio frequencies that is partitioned into transmit RF channels and a receiver circuit having at least one receiver RF filter that passes a receive band of radio frequencies that is partitioned into receive RF channels, wherein the transmit RF channels comprise at least one first end channel, at least one second end channel, and interior channels between the at least one first and second end channels, wherein the receive RF channels comprise at least one first end channel, at least one second end channel, and interior channels between the first and second end channels, and a circuit portion, in a baseband, for compensating at least one of the at least one first and second end channels of the transmit and receive RF channels when the at least one of the at least one first and second end channels is selected and for not compensating for the non-ideal operation of said RF filters of the interior channels of the transmit and receive RF channels when one of the interior channels is selected, wherein the circuitry is capable of compensating the non-ideal RF operation of channels from the transmit and receive bands of frequencies.
Specification