Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1995-12-06
1998-09-15
Vo, Nguyen
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455425, 455446, 455 63, H04B 138, H04M 100
Patent
active
058094318
ABSTRACT:
A local multipoint distribution system having a head end coupled to a plurality of base stations with each base station constituting a cell. Each base station has a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of the cell with RF communication signals. A plurality of RF subscriber stations for each sector of a cell, with each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector. Time division multiple access control is provided at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so that the subscribers in a given sector do not interfere with each others' transmissions, respectively. The power level transmitted by the subscribers are adjusted or controlled so that the subscriber signals arrive at the respective base stations at about the same power level. The cells can be hexagonally shaped and the sectors arranged such that the subscribers do not radiate directly into the three db beam width of base stations of immediately adjacent cells. Alternatively, the cells can be rectangularly shaped and the sectors of the cells arranged such that the subscribers do not radiate directly into the three db beam width of base stations of immediately adjacent cells.
REFERENCES:
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5276907 (1994-01-01), Meidan
patent: 5448753 (1995-09-01), Ahl et al.
patent: 5585850 (1996-12-01), Schwaller
Bustamante Herman
Chen Horen
Armstrong Darnell R.
Stanford Telecommunications, Inc.
Vo Nguyen
Zegeer, Esq. Jim
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