Telecommunications – Transmitter – Diversity
Reexamination Certificate
2007-02-20
2007-02-20
Anderson, Matthew D. (Department: 2618)
Telecommunications
Transmitter
Diversity
C455S103000, C455S121000, C455S561000
Reexamination Certificate
active
10473883
ABSTRACT:
A transmit network for cellular mobile radio networks incorporates tow transmit multiplexers (122ABE) and (122CD): the first transmit multiplexer122ABE receives a group of output signals from three transmitters (124A,124B and124E), and filters them in respective band-pass filters (126A,126B and126E); the second transmit multiplexer (122CD) receives a group of output signals from two further transmitters (124C and124D), and filters them in respective band-pass filters (126C and126D). The transmit frequencies in each signal group are non-adjacent, which improves isolation between transmitters provided by the filters (126). Filtered output signals from respective band-pass filters (126) are combined at filter outputs (128X and128Y) from which signals are combined in a combiner (132) providing a degree of isolation between these outputs and enabling the signals to be combined with minimal distortion. Signals from the combiner (132) are fed via a duplexer to a transmit/receive antenna.
REFERENCES:
patent: 4211894 (1980-07-01), Watanabe et al.
patent: 4641365 (1987-02-01), Montini, Jr.
patent: 5212815 (1993-05-01), Schumacher
patent: 5229729 (1993-07-01), Toshio et al.
patent: 5408690 (1995-04-01), Ishikawa et al.
patent: 5499033 (1996-03-01), Smith
patent: 5584058 (1996-12-01), Pitt
patent: 6085094 (2000-07-01), Vasudevan et al.
patent: 2001/0012788 (2001-08-01), Gammon
patent: 0380914 (1989-08-01), None
patent: 0 566 603 (1996-06-01), None
patent: 2006579 (1979-05-01), None
patent: 92/12579 (1992-07-01), None
patent: 97/44914 (1997-11-01), None
S. Smith, “Site Sharing for Cost Minimisation” www.twsinternational.com/papers/Nov98SiteSharing.pdf, Nov. 1998, pp. 1-7.
B.L. Wixon, “Tunable CDMA Combiners Add Cellular/PCS Capacity” www.klmicrowave.com.news/mrf—sept97.html, Sep. 1997.
Sinclair Technologies Inc., “Suggested VHF/UHF Trunking Configurations Reference Guide” www.sinctech.com, Oct. 2001.
Bradbeer Geoffrey Raymond
Bullers Stephen
Nimmo-Smith Norman Richard
Spicer John Allerton
Thomas Louis David
Anderson Matthew D.
Pham Tuan
Quintel Technology Limited
LandOfFree
Transmit network for a cellular base-station does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmit network for a cellular base-station, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmit network for a cellular base-station will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3853059