Telecommunications receiver and a transmitter

Details Telecommunications receiver and a transmitter Telecommunications receiver and a transmitter

2006-02-21

2006-02-21

Vuong, Quochien B. (Department: 2685)

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

C455S067130, C455S114200, C455S296000, C455S324000, C375S296000, C375S302000, C375S324000

Reexamination Certificate

active

07003263

ABSTRACT:
In a telecommunications transmitter and receiver two IQ-mixers of the same type are operated in 180 degrees phase shift. In both the transmitter and receiver, an input signal is coupled to each IQ-mixer and the output signal of the mixers are combined so as to cancel unwanted error components in each individual output signal. In the transmitter, residual carrier signals are cancelled, and in the receiver, DC-offsets are cancelled. In both, the wanted signals are added, doubling the amplitude of the resultant output signal leading to four times more output power and improved dynamic range.

REFERENCES:
patent: 4736390 (1988-04-01), Ward et al.
patent: 5396196 (1995-03-01), Blodgett
patent: 5438692 (1995-08-01), Mohindra
patent: 5584059 (1996-12-01), Turney et al.
patent: 5724653 (1998-03-01), Baker et al.
patent: 5748681 (1998-05-01), Comino et al.
patent: 6032028 (2000-02-01), Dickey et al.
patent: 6148047 (2000-11-01), Mohindra
patent: 6658070 (2003-12-01), Domokos

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