Method and apparatus for reducing RF filter induced distortion in a wide bandwidth wireless system by the use of channel-dependent RF filter compensation
US7272366B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2001 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Feb 25, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0475
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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 range…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.