Use of low pass filter and equalizer for noise reduction in dire

Details Use of low pass filter and equalizer for noise reduction in dire Use of low pass filter and equalizer for noise reduction in dire

1996-09-25

1999-04-20

Pham, Chi H.

Pulse or digital communications

Transmitters

Antinoise or distortion

375298, 375261, 375229, 332103, H04K 102, H04L 2503

Patent

active

058964215

ABSTRACT:
A transmitter in a base transceiver station in a wireless telephony network uses a direct up-conversion scheme to convert an input signal with in-phase and quadrature phase (I, Q) components to a radio frequency within a transmit band. A low-pass filter filters noise from the input signal components and a phase equalizer equalizes the phase distortions caused by the filtering in the input signal components. The signal components are then provided to an up-converter, such as a quadrature modulator, for conversion to a radio frequency signal within a transmit band. The transmitter of the present invention complies with the TIA'S 15-54 emission requirements.r connected to the first low pass filter and a second phase equalizer connected to the second low pass filter.

REFERENCES:
patent: 4700151 (1987-10-01), Nagata
patent: 4780884 (1988-10-01), Karabinis
patent: 5091919 (1992-02-01), Kuisma
patent: 5193223 (1993-03-01), Walczak et al.
patent: 5323329 (1994-06-01), Keane
patent: 5334945 (1994-08-01), Yokoya et al.
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5517491 (1996-05-01), Nanni et al.
patent: 5521943 (1996-05-01), Dambacher
patent: 5588022 (1996-12-01), Dapper et al.
patent: 5629961 (1997-05-01), Kawabata

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