Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1998-01-14
2000-07-18
Hunter, Daniel S.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
4551501, 4551791, 4551881, H04B 118
Patent
active
060919639
ABSTRACT:
The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occurring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occurring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.
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Carlsson Torsten
Gustafsson Kjell
Hagberg Hans
Isberg Martin
Jakobsson Peter
Hunter Daniel S.
Nguyen Thvan T.
Telefonaktiebolaget LM Ericsson
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