Telecommunications – Wireless distribution system
Patent
1996-05-29
1999-11-16
Le, Vu
Telecommunications
Wireless distribution system
455 63, 348 6, 348 14, 359125, 359137, 359152, H04N 7173
Patent
active
059873035
ABSTRACT:
A wireless transmission and reception system includes a mixing section using a phase shift keying or quadrature amplitude modulation scheme to modulate a baseband signal, representing voice or data, onto a carrier frequency within the range of standard (cable television format) AM-VSB frequencies. A combiner section combines the modulated carrier signal into a channel of a multiplexed cable television (CATV) signal having two or more channels. The CATV signal is used to modulate a laser source. The laser source generates a laser signal based on the CATV signal. The laser signal is optically coupled into a bidirectional fiber link. The fiber link transmits the laser signal and ultimately converts the laser signal into the electrical CATV signal. A splitting section coupled to the bidirectional fiber link splits the modulated carrier signal from the CATV signal. A demodulating section coupled to the splitting section recovers the baseband signal from the modulated carrier signal. The baseband signal is remodulated onto a carrier signal having a designated wireless frequency and is broadcast into free space using an antenna. Signals received by the antenna from free space are amplified and passed through the bidirectional fiber link.
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patent: 5528582 (1996-06-01), Bodeep et al.
patent: 5623422 (1997-04-01), Willliams
patent: 5640196 (1997-06-01), Behrens et al.
patent: 5657374 (1997-08-01), Russell et al.
patent: 5815794 (1998-09-01), Williams
Dutta Niloy Kumar
Freeman Paul Nathan
AT&T Corp.
Le Vu
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