Antenna diversity communications device
First Claim
1. An antenna diversity communications device for communicating by frequency hopping among a plurality of channels, comprising:
- at least two antennas;
a unit operable to determine a pre-detection diversity of signals from said at least two antennas; and
a unit operable to switch signals from said at least two antennas based on frequency correlation between a current channel and a next channel.
1 Assignment
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Accused Products
Abstract
An antenna diversity communications device switches communications paths between a plurality of antennas to improve reception in a frequency diversity communications system. Antenna selection is done in response to measurement of the receiving condition of the selected antenna. A memory unit stores frequency difference information between the current channel and the next channel. When the frequency difference between the current channel and the next channel is small enough to predict good correlation between the channels, and if current receiving conditions are good, the current channel remains connected. When the frequency difference between the current channel and the next channel is large enough to predict poor correlation, or if the receiving conditions on the current channel are bad, one of the other channels is selected.
33 Citations
26 Claims
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1. An antenna diversity communications device for communicating by frequency hopping among a plurality of channels, comprising:
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at least two antennas; a unit operable to determine a pre-detection diversity of signals from said at least two antennas; and a unit operable to switch signals from said at least two antennas based on frequency correlation between a current channel and a next channel. - View Dependent Claims (2)
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3. An antenna diversity communications device comprising:
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at least first and second antennas; a switching unit operable to alternatively select a received signal from one of said at least first and second antennas; a reception information measuring unit operable to measure received information that indicates a receiving condition of one of said at least first and second antenna currently selected by said switching unit; a memory unit operable to store frequency difference information between a current channel and a next channel; a switching control unit operable to control said switching unit;
said switching control unit being responsive to said frequency difference information and said signal information to order said switching unit to connect to a different one of said at least first and second antennas when hopping to a next channel if a high frequency correlation exists between said current channel and said next channel and a current receiving condition is poor. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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12. An antenna diversity communications device for communicating by means of frequency hopping, said communications device comprising:
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at least first and second communications paths; a first antenna on said first communications path; a second antenna on said second communications path; a switching unit operable to alternatively select one said first and second communications paths from said at least first and second communications paths; a reception information measuring unit operable to measure signal information that indicates a receiving condition of a path selected by said switching unit; a memory unit operable to store signal information measured by said reception information measuring unit; and a unit operable to select one of said at least first and second communications paths based on said signal information stored in said memory unit; wherein said signal information of a hopping frequency of a current channel is updated each time said hopping frequency is switched, said signal information of said hopping frequency of said current channel being stored in said memory unit, and said signal information stored in said memory unit is updated altogether in a range where high correlations between said corresponding hopping frequencies exist. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification