Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Reexamination Certificate
2007-05-08
2007-05-08
Maung, Nay (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
C455S165100, C455S183100, C455S205000, C375S223000, C375S239000, C375S241000
Reexamination Certificate
active
10363158
ABSTRACT:
This patent describes a method and system which overcomes the LO-leakage problem during modulation and demodulation, common to direct conversion and similar RF transmitters and receivers. This problem is solved using a virtual local oscillator (VLO™) signal which emulates mixing with a local oscillators (LO) signal. The VLO signal is constructed using complementary mixing signals that suppress mixing power in the bandwidth of the input signal, and within the bandwidth of the output frequency. Specifically, mixing is done in two or more stages, using time-varying mixing signals φ1and φ2which satisfy the following criteria: φ1*φ2having significant power at the frequency of the LO being emulated, one of φ1and φ2having minimal power around the frequency of the output signal y(t), and the other of φ1and φ2having minimal power around the center frequency, fRF, of the input signal x(t).
REFERENCES:
patent: 4110834 (1978-08-01), Altwein
patent: 4791377 (1988-12-01), Grandfield et al.
patent: 5390346 (1995-02-01), Marz
patent: 5519732 (1996-05-01), Chester
patent: 5572264 (1996-11-01), Mizukami et al.
patent: 5796783 (1998-08-01), Crawford
patent: 5838717 (1998-11-01), Ishii et al.
patent: 6014408 (2000-01-01), Naruse et al.
patent: 6061551 (2000-05-01), Sorrells et al.
patent: 6798848 (2004-09-01), Claxton et al.
patent: 6965759 (2005-11-01), Aoki
patent: 2001/0024943 (2001-09-01), Welland
patent: 2002/0094794 (2002-07-01), Manku et al.
patent: 2004/0131125 (2004-07-01), Sanderford et al.
patent: 2005/0153677 (2005-07-01), Vorenkamp et al.
patent: 0837565 (1998-04-01), None
patent: 902549 (1999-03-01), None
patent: 977351 (2000-02-01), None
patent: 2331207 (1999-05-01), None
patent: 9601006 (1996-01-01), None
Multi Carrier Spread Spectrum Modulation with Reduced Dynamic Range by Aue et al. 1996.
International Search Report dated Oct. 10, 2002.
Manku Tajinder
Snyder Chris
Weale Gareth
Wong Lawrence
Borden Ladner Gervais LLP
Hung Shin
Maung Nay
Sirific Wireless Corporation
Wendell Andrew
LandOfFree
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