System and method for dynamic signal interference detection during testing of a data packet signal transceiver
View Patent ↗A system and method for testing multiple wireless data packet signal transceiver devices under test (DUTs) with dynamic signal interference compensation. Transmit data packets originating from other DUTs are monitored during receive signal testing of a selected DUT for concurrent occurrences of transmit and receive data packets. From this, it can be determined whether a failure to receive a responsive data packet, such as an acknowledgement, from the selected DUT is likely due to interference from a transmit data packet from another DUT being at least substantially concurrent with the receive data packet to which the selected DUT was expected to respond. If so, one or more receive data packets can be added to the receive signal sequence to extend the test and determine an accurate packet error rate (PER) without requiring a repeat of the full test.
1. An apparatus including a system for testing multiple wireless data packet signal transceiver devices under test (DUTs) with dynamic signal interference compensation, comprising:
a plurality of data packet signal paths for communicating with a plurality of DUTs by conveying a corresponding plurality of transmit data packet signals from said plurality of DUTs and a receive data packet signal to said plurality of DUTs, and including
signal routing circuitry responsive to one or more path control signals by conveying, via a selected one of said plurality of data packet signal paths, a selected one of said plurality of transmit data packet signals from a selected one of said plurality of DUTs and conveying said receive data packet signal to said selected one of said plurality of DUTs, and
signal measurement circuitry coupled to said signal routing circuitry and responsive to said plurality of transmit data packet signals by providing one or more measurement signals indicative of reception of respective ones of said plurality of transmit data packet signals; and
test circuitry coupled to said plurality of data packet signal paths to receive said plurality of transmit data packet signals and provide said receive data packet signal with at least a predetermined number of data packets, and responsive to said one or more measurement signals by including one or more additional data packets in said receive data packet signal following
said one or more measurement signals being indicative of reception, substantially coincident with a current data packet of said receive data packet signal, of at least one data packet of one or more of said plurality of transmit data packet signals from other than said selected one of said plurality of DUTs, and
a failure to receive a data packet of said selected one of said plurality of transmit data packet signals corresponding to said current data packet of said receive data packet signal.
2. The apparatus of claim 1 , wherein said one or more measurement signals is indicative of at least one of a start, duration and cessation of each one of said plurality of transmit data packet signals.
3. The apparatus of claim 1 , wherein said test circuitry is responsive to said one or more measurement signals by including one additional data packet in said receive data packet signal for an occurrence of both:
said one or more measurement signals being indicative of reception, substantially coincident with a current data packet of said receive data packet signal, of at least one data packet of one or more of said plurality of transmit data packet signals from other than said selected one of said plurality of DUTs; and
a failure to receive a data packet of said selected one of said plurality of transmit data packet signals corresponding to said current data packet of said receive data packet signal.
4. The apparatus of claim 1 , wherein said test circuitry is further responsive to said one or more measurement signals by refraining from including an additional data packet in said receive data packet signal for an occurrence of only one of:
said one or more measurement signals being indicative of reception, substantially coincident with a current data packet of said receive data packet signal, of at least one data packet of one or more of said plurality of transmit data packet signals from other than said selected one of said plurality of DUTs; and
a failure to receive a data packet of said selected one of said plurality of transmit data packet signals corresponding to said current data packet of said receive data packet signal.
5. The apparatus of claim 1 , wherein said respective portion of said selected one of said plurality of transmit data packet signals corresponding to each portion of said receive data packet signal conveyed to said selected one of said plurality of DUTs comprises an acknowledgment data packet.
6. The apparatus of claim 1 , wherein said plurality of data packet signal paths comprises a plurality of conductive radio frequency (RF) signal connections.
7. The apparatus of claim 1 , wherein said signal routing circuitry comprises at least one of a radio frequency (RF) signal multiplexor and RF signal switch.
8. The apparatus of claim 1 , wherein said signal measurement circuitry comprises at least one of a radio frequency (RF) signal power sensor, RF signal power meter and a data packet signal receiver.
9. The apparatus of claim 1 , wherein said test circuitry comprises at least one of a vector signal generator (VSG) and vector signal analyzer (VSA).
10. A method of testing multiple wireless data packet signal transceiver devices under test (DUTs) with dynamic signal interference compensation, comprising:
providing a plurality of data packet signal paths for communicating with a plurality of DUTs by conveying a corresponding plurality of transmit data packet signals from said plurality of DUTs and a receive data packet signal to said plurality of DUTs;
responding to one or more path control signals by conveying, via a selected one of said plurality of data packet signal paths, a selected one of said plurality of transmit data packet signals from a selected one of said plurality of DUTs and conveying said receive data packet signal to said selected one of said plurality of DUTs;
responding to said plurality of transmit data packet signals by providing one or more measurement signals indicative of reception of respective ones of said plurality of transmit data packet signals;
receiving said plurality of transmit data packet signals;
providing said receive data packet signal with at least a predetermined number of data packets; and
responding to said one or more measurement signals by including one or more additional data packets in said receive data packet signal following
said one or more measurement signals being indicative of reception, substantially coincident with a current data packet of said receive data packet signal, of at least one data packet of one or more of said plurality of transmit data packet signals from other than said selected one of said plurality of DUTs, and
a failure to receive a data packet of said selected one of said plurality of transmit data packet signals corresponding to said current data packet of said receive data packet signal.
11. The method of claim 10 , wherein said one or more measurement signals is indicative of at least one of a start, duration and cessation of each one of said plurality of transmit data packet signals.
12. The method of claim 10 , wherein said responding to said one or more measurement signals by including one or more additional data packets in said receive data packet signal comprises responding to said one or more measurement signals by including one additional data packet in said receive data packet signal for an occurrence of both:
said one or more measurement signals being indicative of reception, substantially coincident with a current data packet of said receive data packet signal, of at least one data packet of one or more of said plurality of transmit data packet signals from other than said selected one of said plurality of DUTs; and
a failure to receive a data packet of said selected one of said plurality of transmit data packet signals corresponding to said current data packet of said receive data packet signal.
13. The method of claim 10 , further comprising responding to said one or more measurement signals by refraining from including an additional data packet in said receive data packet signal for an occurrence of only one of:
said one or more measurement signals being indicative of reception, substantially coincident with a current data packet of said receive data packet signal, of at least one data packet of one or more of said plurality of transmit data packet signals from other than said selected one of said plurality of DUTs; and
a failure to receive a data packet of said selected one of said plurality of transmit data packet signals corresponding to said current data packet of said receive data packet signal.
14. The method of claim 10 , wherein said respective portion of said selected one of said plurality of transmit data packet signals corresponding to each portion of said receive data packet signal conveyed to said selected one of said plurality of DUTs comprises an acknowledgment data packet.
15. The method of claim 10 , wherein said providing a plurality of data packet signal paths comprises providing a plurality of conductive radio frequency (RF) signal connections.
16. The method of claim 10 , wherein said responding to one or more path control signals by conveying, via a selected one of said plurality of data packet signal paths, a selected one of said plurality of transmit data packet signals from a selected one of said plurality of DUTs and conveying said receive data packet signal to said selected one of said plurality of DUTs comprises conveying said selected one of said plurality of transmit data packet signals and said receive data packet signal via at least one of a radio frequency (RF) signal multiplexor and RF signal switch.
17. The method of claim 10 , wherein said responding to said plurality of transmit data packet signals by providing one or more measurement signals indicative of reception of respective ones of said plurality of transmit data packet signals comprises measuring signal powers of respective ones of said plurality of transmit data packet signals.
18. The method of claim 10 , wherein:
said receiving said plurality of transmit data packet signals comprises receiving said plurality of transmit data packet signals with a vector signal analyzer (VSA); and
said providing said receive data packet signal comprises providing said receive data packet signal with a vector signal generator (VSG).