System and method for transmit and receive antenna patterns calibration for time division duplex (TDD) systems
First Claim
1. A method of calibrating a station in a communications network comprising at least two antennas configured to operate together for both transmitting and receiving modes, and a plurality of radio circuits configured to transmit and receive via said antennas in a time division duplex (TDD) communication protocol, the method comprising:
- determining, by a processor, a phase setting difference between transmit and receive antenna patterns of said at least two antennas operating together, if the signals received from another station have a minimum signal strength then the receive antenna patterns are measured, and the transmit antenna patterns are determined based on a transmit data rate to another station;
using, by the processor, said phase setting difference to determine one or both of;
a relative amplitude setting for transmit antenna patterns, and a relative amplitude setting for receive antenna patterns; and
calibrating the station by adjusting, by the processor, one or both of;
each transmit antenna pattern transmitted by the station by the relative amplitude setting for the transmit antenna patterns, and each receive antenna pattern received by the station by the relative amplitude setting for the receive antenna patterns.
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Accused Products
Abstract
A method and system for calibrating transmit and receive antenna patterns for time division duplex (TDD) is described. A station in a communications network comprises at least two antennas configured to operate together for both transmitting and receiving modes. A phase setting difference between the transmit and receive antenna patterns may be determined and used to determine a relative amplitude setting for the transmit antenna pattern and/or a relative amplitude setting for the receive antenna pattern.
347 Citations
21 Claims
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1. A method of calibrating a station in a communications network comprising at least two antennas configured to operate together for both transmitting and receiving modes, and a plurality of radio circuits configured to transmit and receive via said antennas in a time division duplex (TDD) communication protocol, the method comprising:
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determining, by a processor, a phase setting difference between transmit and receive antenna patterns of said at least two antennas operating together, if the signals received from another station have a minimum signal strength then the receive antenna patterns are measured, and the transmit antenna patterns are determined based on a transmit data rate to another station; using, by the processor, said phase setting difference to determine one or both of;
a relative amplitude setting for transmit antenna patterns, and a relative amplitude setting for receive antenna patterns; andcalibrating the station by adjusting, by the processor, one or both of;
each transmit antenna pattern transmitted by the station by the relative amplitude setting for the transmit antenna patterns, and each receive antenna pattern received by the station by the relative amplitude setting for the receive antenna patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system comprising:
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a plurality of antennas configured to operate together for both transmitting and receiving, a plurality of radio circuits configured to transmit and receive via said antennas in a time division duplex (TDD) communication protocol; and a baseband processor configured to; determine a phase setting difference between the transmit and receive antenna patterns of said at least two antennas operating together if the signals received from another station have a minimum signal strength then the receive antenna patterns are measured, and the transmit antenna patterns are determined based on a transmit data rate to another station; use said phase setting difference to determine one or both of;
a relative amplitude setting for transmit antenna patterns, and a relative amplitude setting for receive patterns; andcalibrate the station by adjusting one or both of;
(a) each transmit antenna pattern transmitted by the station by the relative amplitude setting for the transmit antenna patterns, and (b) each receive antenna pattern received by the station by the relative amplitude setting for the receive antenna patterns. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of calibrating a station in a communications network comprising at least two antennas configured to operate together for both transmitting and receiving modes, and a plurality of radio circuits configured to transmit and receive via said antennas in a time division duplex (TDD) communication protocol, the method comprising:
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using, by a processor, a predetermined phase difference between receive and transmit antenna patterns, if the signals received from another station have a minimum signal strength then the receive antenna patterns are measured, and the transmit antenna patterns are determined based on a transmit data rate to another station, for at least two antennas operating together, to determine one or both of;
a relative amplitude setting for transmit antenna patterns and a relative amplitude setting for receive antenna patterns, to achieve a null in a signal received from or transmitted to another station by said at least two antennas; andcalibrating the station by adjusting, by the processor, one or both of;
a) each transmit antenna pattern transmitted by the station by the relative amplitude setting for the transmit antenna patterns, and each receive antenna pattern received by the station by the relative amplitude setting for the receive antenna patterns.
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Specification