System and method for testing radio frequency wireless signal transceivers using wireless test signals
View Patent ↗A method for facilitating wireless testing of a radio frequency (RF) signal transceiver device under test (DUT). Using multiple antennas within a shielded enclosure containing the DUT, multiple wireless RF test signals resulting from a RF test signal radiated from the DUT are captured and their respective signal phases are controlled prior to being combined to form a composite RF signal. This process is repeated until power level differences between signal power levels at respective pairs of a selected number of RF signal frequencies have values between predetermined minimum and maximum values, thereby providing compensation for the multipath signal environment within the shielded enclosure, and thereby simulating a wired test signal path during wireless testing of the DUT.
1. A method of facilitating wireless testing of a radio frequency (RF) signal transceiver device under test (DUT), comprising:
receiving at least one plurality of wireless RF test signals having a plurality of respective RF test signal phases and related to a common RF test signal radiated from a DUT disposed within an interior region of a structure, wherein
said common RF test signal includes a plurality of RF signal frequencies defining a RF signal frequency range, and
said structure defines said interior region and an exterior region, and is configured to substantially isolate said interior region from electromagnetic radiation originating from said exterior region;
controlling respective phases of at least a portion of said plurality of respective RF test signals to provide a plurality of phase-controlled RF signals;
combining at least said plurality of phase-controlled RF signals to provide a composite RF signal having a signal power level at each one of said plurality of RF signal frequencies; and
repeating said receiving, controlling and combining until each one of a plurality of power level differences between said signal power levels at respective pairs of a portion of said plurality of RF signal frequencies has a value between predetermined minimum and maximum values.
2. The method of claim 1 , wherein said receiving at least one plurality of wireless RF test signals having a plurality of respective RF test signal phases and related to a common RF test signal radiated from a DUT disposed within an interior region of a structure comprises receiving at least one plurality of wireless RF test signals with a plurality of antenna arrays, each of which includes multiple antenna elements, disposed at least partially within said interior region.
3. The method of claim 1 , wherein said controlling respective phases of at least a portion of said plurality of respective RF test signals to provide a plurality of phase-controlled RF signals comprises iteratively controlling said respective phases.
4. The method of claim 1 , wherein said controlling respective phases of at least a portion of said plurality of respective RF test signals to provide a plurality of phase-controlled RF signals comprises:
defining a respective signal phase shift value for each one of said at least a portion of said plurality of respective RF test signals; and
adjusting said respective signal phase shift value for each one of one or more sub-portions of said at least a portion of said plurality of respective RF test signals.
5. The method of claim 1 , wherein said combining at least said plurality of phase-controlled RF signals to provide a composite RF signal having a signal power level at each one of said plurality of RF signal frequencies comprises summing said at least said plurality of phase-controlled RF signals.
6. The method of claim 1 , wherein said repeating said receiving, controlling and combining until each one of a plurality of power level differences between said signal power levels at respective pairs of a portion of said plurality of RF signal frequencies has a value between predetermined minimum and maximum values comprises iteratively adjusting a respective signal phase shift value for each one of one or more sub-portions of said at least a portion of said plurality of respective RF test signals.
7. The method of claim 1 , wherein said repeating said receiving, controlling and combining until each one of at least a portion of said plurality of power level differences has a value between predetermined minimum and maximum values comprises iteratively adjusting a respective signal phase shift value for each one of one or more sub-portions of said at least a portion of said plurality of respective RF test signals.
8. A method of facilitating wireless testing of a radio frequency (RF) signal transceiver device under test (DUT), comprising:
receiving at least one plurality of wireless RF test signals having a plurality of respective RF test signal phases and related to a common RF test signal radiated from a DUT disposed within an interior region of a structure, wherein
said common RF test signal includes a plurality of RF signal frequencies defining a RF signal frequency range, and
said structure defines said interior region and an exterior region, and is configured to substantially isolate said interior region from electromagnetic radiation originating from said exterior region;
controlling respective phases of at least a portion of said plurality of respective RF test signals to provide a plurality of phase-controlled RF signals;
combining at least said plurality of phase-controlled RF signals to provide a composite RF signal;
measuring a power level of said composite RF signal at each one of a portion of said plurality of RF signal frequencies;
computing a plurality of power level differences between said signal power levels at respective pairs of a portion of said plurality of RF signal frequencies; and
repeating said receiving, controlling and combining until each one of at least a portion of said plurality of power level differences has a value between predetermined minimum and maximum values.
9. The method of claim 8 , wherein said receiving at least one plurality of wireless RF test signals having a plurality of respective RF test signal phases and related to a common RF test signal radiated from a DUT disposed within an interior region of a structure comprises receiving at least one plurality of wireless RF test signals with a plurality of antenna arrays, each of which includes multiple antenna elements, disposed at least partially within said interior region.
10. The method of claim 8 , wherein said controlling respective phases of at least a portion of said plurality of respective RF test signals to provide a plurality of phase-controlled RF signals comprises iteratively controlling said respective phases.
11. The method of claim 8 , wherein said controlling respective phases of at least a portion of said plurality of respective RF test signals to provide a plurality of phase-controlled RF signals comprises:
defining a respective signal phase shift value for each one of said at least a portion of said plurality of respective RF test signals; and
adjusting said respective signal phase shift value for each one of one or more sub-portions of said at least a portion of said plurality of respective RF test signals.
12. The method of claim 8 , wherein said combining at least said plurality of phase-controlled RF signals to provide a composite RF signal having a signal power level at each one of said plurality of RF signal frequencies comprises summing said at least said plurality of phase-controlled RF signals.