Antenna selecting diversity receiving apparatus
First Claim
1. An antenna selecting diversity receiving apparatus for use in a time-division multiplexing radio communication system which uses a linear modulating wave, for selecting one of a plurality of antennas which receives a strongest electric field, and to connect the antenna thus selected to a radio receiver through an antenna switching circuit, said apparatus comprising:
- an integrating circuit for respectively integrating electric field levels received by each of said plurality of antennas before a start point of a time slot allotted to said radio receiver, for a predetermined period of time and for outputting the time-integrated electric field level values therefrom;
a comparing circuit for making a comparison among the respective time-integrated values form said integrating circuit, corresponding to each of said plurality of antennas; and
a changeover control circuit for selecting an antenna corresponding to the maximum time-integrated value based on the result of comparison by said comparing circuit by controlling said antenna switching circuit to connect the antenna thus selected to said radio receiver during a period of said allotted time slot.
1 Assignment
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Accused Products
Abstract
An antenna selecting diversity receiving apparatus utilizes linear modulation with information about the envelope of a modulating wave included therein and is employed in a radio communication system using TDM. An integrating circuit serves to integrate electric-field levels received by respective antennas over a predetermined period of time before a start in a time slot allotted to a radio receiver. Then, a comparing circuit makes a comparison among respective time-integrated values corresponding to the respective antennas. In addition, a changeover control circuit serves to select an antenna corresponding to the maximum time-integrated value as the antenna used during the period of the time slot allotted to the radio receiver.
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Citations
9 Claims
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1. An antenna selecting diversity receiving apparatus for use in a time-division multiplexing radio communication system which uses a linear modulating wave, for selecting one of a plurality of antennas which receives a strongest electric field, and to connect the antenna thus selected to a radio receiver through an antenna switching circuit, said apparatus comprising:
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an integrating circuit for respectively integrating electric field levels received by each of said plurality of antennas before a start point of a time slot allotted to said radio receiver, for a predetermined period of time and for outputting the time-integrated electric field level values therefrom; a comparing circuit for making a comparison among the respective time-integrated values form said integrating circuit, corresponding to each of said plurality of antennas; and a changeover control circuit for selecting an antenna corresponding to the maximum time-integrated value based on the result of comparison by said comparing circuit by controlling said antenna switching circuit to connect the antenna thus selected to said radio receiver during a period of said allotted time slot. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An antenna selecting diversity receiving apparatus for use ia time-division multiplexing radio communication system which uses a linear modulating wave, for selecting on of a plurality of antennas which receives a strongest electric field, and to connect the antenna thus selected to a radio receiver through an antenna switching circuit, said apparatus comprising:
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an integrating circuit for respectively integrating electric field levels received by each of said plurality of antennas before a start point of a time slot allotted to said radio receiver, for a predetermined period of time and for outputting the time-integrated electric field level values therefrom; a prediction circuit for predicting variations int he electric field levels received by each of said plurality of antennas during the period of the time slot allotted to said radio receiver, based on the time-integrated values supplied form said integrating circuit before the allotted time slot period of said radio receiver; and a changeover control circuit for selecting an antenna which receives the strongest electric field bas con the result of prediction by said prediction circuit by controlling said antenna switching circuit such that the antenna thus selected is electrically connected to said radio receiver. - View Dependent Claims (8, 9)
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Specification