Systems and methods for simulating a multipath radio frequency environment
First Claim
1. A method of simulating a multipath environment, the method comprising:
- placing a plurality of antennas at various angles around a test position within an anechoic chamber, the plurality of antennas adapted to produce substantially plane waves at the test position;
connecting the plurality of the antennas to a variable path simulator having multiple separate paths to introduce user-defined delay spreads into each path connected to an antenna, wherein each path of the variable path simulator is coupled to a different one of the plurality of antennas; and
receiving or transmitting by the plurality of antennas, a plurality of signals, each signal associated with a different one of the plurality of antennas, and wherein each signal propagates through a separate one of the multiple separate paths of the variable path simulator to enable simulation of reflections and interference sources at different angles and distances.
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Abstract
Embodiments include systems and methods for simulating a multipath environment for testing a device. In one embodiment, a plurality of antennas are placed around a device under test in an anechoic chamber. Each of a plurality of the antennas is connected to a path of a variable path simulator capable of generating multiple paths between the antennas and external wireless communication test equipment. The variable path simulator introduces a delay spread into each path. In this way, a multipath environment is simulated with signals appearing to arrive from different angles and different distances. Each of a plurality of antennas may be adapted to produce substantially plane waves at the device under test.
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Citations
19 Claims
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1. A method of simulating a multipath environment, the method comprising:
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placing a plurality of antennas at various angles around a test position within an anechoic chamber, the plurality of antennas adapted to produce substantially plane waves at the test position; connecting the plurality of the antennas to a variable path simulator having multiple separate paths to introduce user-defined delay spreads into each path connected to an antenna, wherein each path of the variable path simulator is coupled to a different one of the plurality of antennas; and receiving or transmitting by the plurality of antennas, a plurality of signals, each signal associated with a different one of the plurality of antennas, and wherein each signal propagates through a separate one of the multiple separate paths of the variable path simulator to enable simulation of reflections and interference sources at different angles and distances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A test system for testing a device in a multipath environment, the test system comprising:
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a plurality of antennas disposed at various positions around a test position within an anechoic chamber, the plurality of antennas adapted to produce substantially plane waves at the test position; and a variable path simulator with different paths connected to different ones of the plurality of antennas to introduce a different delay spread into each path connected to an antenna; wherein the positions of the antennas and the delays introduced by the variable path simulator enable simulation of electromagnetic fields from reflections and interference sources at different angles and distances. - View Dependent Claims (10, 12, 13, 14)
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11. The test system of 10, wherein the flared-notch antenna elements are arranged to provide dual polarization.
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15. A system for simulating a multi-path environment, the system comprising:
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a plurality of antennas adapted to produce substantially plane waves at a test position; a simulator to simulate a plurality of spatial paths, each spatial path coupled to a different one of the plurality of antennas, a Multiple Input Multiple Output (MIMO) tester to measure a signal in each of M emulated channels coupled to N spatial paths of the simulator, where M and N are integers. - View Dependent Claims (16, 17, 18, 19)
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Specification