Multiple access communication system with polarized antennas

• US 6,275,704 B1
• Filed: 03/03/1997
• Issued: 08/14/2001
• Est. Priority Date: 03/03/1997
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Xircom Incorporated (Intel Corporation)
• Inventors: Dixon, Robert C.
• Primary Examiner(s): Maung, Nay
• Application Number:
  US08/810,354
• Time in Patent Office: 1,625 Days
• Field of Search: 455/422, 455/446, 455/447, 455/448, 455/454, 455/562, 370/319, 370/320, 370/321, 370/328, 343/874, 343/875, 343/879, 343/890, 343/891, 343/893
• US Class Current: 455/446
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
• CPC Class Codes: H04W 16/24 Cell structures

Abstract

A multiple access communication system comprising a plurality of cells, each cell comprising a plurality of sectors. A base station is located in each cell and has a plurality of antennas. Each antenna covers a sector of the cell and is associated with a polarization characteristic. In one embodiment, each cell has two sectors, and each sector facing a first direction has an antenna with a first polarization characteristic, while each sector facing a second, opposite direction has an antenna with a second polarization characteristic. In another embodiment, each cell is divided into four sectors generally arranged as quadrants. Two adjacent sectors have antennas with a first polarization characteristic, while the other two adjacent sectors have antennas with a second polarization characteristic. In a preferred embodiment, the first polarization characteristic is left hand circular polarization, and the second polarization characteristic is right hand circular polarization. Alternatively, vertically polarized antennas and horizontally polarized antennas may be used instead of circularly polarized antennas. Frequencies may be assigned to the cells in a three-frequency reuse pattern or a seven-frequency reuse pattern, or in any other suitable arrangement.

Claims

1. A wireless system, comprising:

a plurality of cells disposed in a repeating frequency reuse pattern, such that a frequency assigned to each cell is different from frequencies assigned to its immediately adjacent cells;

each of said cells including at least a first, second, third, and fourth sector;

a base station in each of said cells and having a plurality of antennas;

a first antenna associated with each of said first sectors in each of said plurality of cells;

a second antenna associated with each of said second sectors in each of said plurality of cells, said first antenna associated with a first polarization characteristic, and said second antenna associated with a second polarization characteristic, wherein said first and second sectors in adjacent cells are substantially adjacent to one another;

a third antenna associated with each of said third sectors in each of said plurality of cells; and

a fourth antennas associated with each of said fourth sectors in each of said plurality of cells, said third antenna associated with said first polarization characteristic, and said fourth antenna associated with said second polarization characteristic, wherein said third and fourth sectors in adjacent cells are substantially adjacent to one another.

2. The multiple access communication system of claim 1 wherein said first sector, said second sector, said third sector and said fourth sector are arranged as quadrants of said cell, said first sector adjacent to said third sector, and said second sector adjacent to said fourth sector.

3. The multiple access communication system of claim 1 wherein said first antenna and said third antenna are left hand circularly polarized, and said second antenna and said fourth antenna are right hand circularly polarized.

4. A communication system, comprising:

a plurality of cells, each cell having a plurality of sectors, including at least a first, second, third, and fourth sector, each sector being oriented in an identical pattern,

a plurality of base stations, at least one base station located in each of said plurality of cells, and each base station having a plurality of antennas, including a first antenna associated with each of said first sectors in each of said plurality of cells, a second antenna associated with each of said second sectors in each of said plurality of cells, a third antenna associated with each of said third sectors in each of said plurality of cells, and a fourth antenna associated with each of said fourth sectors in each of said plurality of cells;

said first antenna and said third antenna having a first polarity, and said second antenna and said fourth antenna having a second polarity;

wherein said first and second sectors in adjacent cells are substantially adjacent to one another and said third and fourth sectors in adjacent cells are substantially adjacent to one another.

5. A method for configuring a communication system, comprising the steps of:

dividing a geographic region into a plurality of cells, including a first cell and a second cell;

assigning a first frequency to said first cell and a second frequency to said second cell;

dividing each of said cells into an identical pattern of sectors, comprising at least a first, second, third, and fourth sector, wherein said first and second sectors in adjacent cells are substantially adjacent to one another and said third and fourth sectors in adjacent cells are substantially adjacent to one another;

locating a base station in each of said cells, each base station having a plurality of antennas, including at least a first antenna associated with each of said first sectors in each of said plurality of cells, a second antenna associated with each of said second sectors in each of said plurality of cells, a third antenna associated with each of said third sectors in each of said plurality of cells, and a fourth antenna associated with each of said fourth sectors in each of said plurality of cells having a second polarization characteristic; and

selecting a first polarity for said first antennas and said third antennas, and selecting a second polarity for said second antennas and said fourth antennas.