Multiplex communications – Duplex – Communication over free space
Patent
1997-02-26
1998-12-22
Ton, Dang
Multiplex communications
Duplex
Communication over free space
370281, H04J 300
Patent
active
058526030
ABSTRACT:
A transceiver is described which in a FDD mode of operation receives at a first frequency (F1) and transmits at a second frequency (F2); and in a TDD mode of operation receives and transmits at a third frequency (F3). The transceiver incorporates in a receiving branch at least a first mixer for forming a first intermediate frequency (IF1) from a received frequency (F1, F3) and a first local oscillator frequency (LO1); and a second mixer for forming a second intermediate frequency (IF2) from the first intermediate frequency (IF1) and the second local oscillator frequency (LO2). In a transmission branch the transceiver includes a modulator for modulating signals to be transmitted (TXI, TXQ) to a third intermediate frequency (IF3); a third mixer (16) for forming a transmission frequency (F2, F3) from a third intermediate frequency (IF3) and a fourth local oscillator frequency (LO4). Also included is a first synthesizer for forming equally high first and fourth local oscillator frequencies (LO1, LO4), and a second synthesizer and a frequency multiplier or divider and a switching arrangement for forming and switching a fourth frequency (FS) and its M times multiple (M*FS) such that the fourth frequency (FS) is an absolute value of the difference between the reception frequency (F1) and the transmission frequency (F2) of the FDD mode of operation divided by (M-1).
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24th European Microwave Conference, 5-8 Sep. 1994, Cannes pp. 1575-1580; Lehtinen et al., "High frequency part of a real time test mobile station for UMTS system evaluations".
Lehtinen Kari
Pesola Mikko
Nokia Mobile Phones Limited
Ton Dang
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