Method for testing sensitivity of a data packet signal transceiver
A method for using a test data packet signal to test a data packet signal transceiver device under test (DUT) having an operating characteristic defined by a data packet error rate (PER) as a function of data packet signal power (PWR). The test data packet signal power is varied and a test PER is computed as a function of DUT response data packets and test data packets until a measured test PER or a computed test PER extrapolated from measured PERs is equal to a predetermined PER less than and greater than maximum and minimum PERs, respectively.
1. A method of testing a data packet signal transceiver, comprising:
providing, via a signal path, a test data packet signal having a test data packet signal power and including a plurality of test data packets and a plurality of test data packet signal power levels for reception by a device under test (DUT) having an operating characteristic defined by a data packet error rate (PER) as a function of data packet signal power (PWR) with a maximum PER at a minimum PWR, a minimum PER at a maximum PWR and a plurality of intermediate data packet error rates (PERs) at a plurality of intermediate data packet signal powers (PWRs) between said minimum PWR and said maximum PWR;
receiving, from said DUT via said signal path, a plurality of response data packets each of which is indicative of reception of at least one of said plurality of test data packets;
computing a test PER as a function of said plurality of response data packets and said plurality of test data packets;
repeating said providing, receiving and computing while providing said test data packet signal power iteratively at alternating incrementally higher and lower power levels, at least once on a packet-by-packet basis, to produce, as a function of successive ones of said received pluralities of response data packets and corresponding ones of said pluralities of test data packets, a plurality of subsequent test PERs by decreasing said PWR after computing a test PER lower than a predetermined one of said plurality of intermediate PERs at one of said plurality of intermediate PWRs and increasing said PWR after computing a test PER higher than said predetermined one of said plurality of intermediate PERs, wherein said PER as a function of said PWR defines a non-linear modulation curve having
a maximum PER versus PWR variation at said predetermined one of said plurality of intermediate PERs, and
PER versus PWR variations less than said maximum PER versus PWR variation at remaining ones of said plurality of intermediate PERs higher and lower than said predetermined one of said plurality of intermediate PERs; and
terminating said repeating said providing, receiving and computing in response to said plurality of subsequent test PERs including at least one of
a measured test PER substantially equal to said predetermined one of said plurality of intermediate PERs, or
at least one higher test PER and one lower test PER than said predetermined one of said plurality of intermediate PERs.
2. The method of claim 1 , wherein said predetermined one of said plurality of intermediate PERs is substantially equal to 50 percent.
3. The method of claim 1 , wherein:
said predetermined one of said plurality of intermediate PERs corresponds to a target one of said plurality of intermediate PWRs; and
said providing a test data packet signal having a test data packet signal power comprises providing said test data packet signal having an initial test data packet signal power less than said target one of said plurality of intermediate PWRs.
4. The method of claim 3 , wherein said predetermined one of said plurality of intermediate PERs is substantially equal to 50 percent.
5. The method of claim 1 , wherein:
said predetermined one of said plurality of intermediate PERs corresponds to a target one of said plurality of intermediate PWRs; and
said providing a test data packet signal having a test data packet signal power comprises providing said test data packet signal having an initial test data packet signal power greater than said target one of said plurality of intermediate PWRs.
6. The method of claim 5 , wherein said predetermined one of said plurality of intermediate PERs is substantially equal to 50 percent.
7. A method of testing a data packet signal transceiver, comprising:
receiving, via a signal path with a data packet signal transceiver device under test (DUT), a test data packet signal having a test data packet signal power and including a plurality of test data packets and a plurality of test data packet signal power levels, wherein said DUT has an operating characteristic defined by a data packet error rate (PER) as a function of data packet signal power (PWR) with a maximum PER at a minimum PWR, a minimum PER at a maximum PWR and a plurality of intermediate data packet error rates (PERs) at a plurality of intermediate data packet signal powers (PWRs) between said minimum PWR and said maximum PWR;
providing, with said DUT via said signal path, a plurality of response data packets each of which is indicative of reception of at least one of said plurality of test data packets;
computing a test PER as a function of said plurality of response data packets and said plurality of test data packets;
repeating said receiving, providing and computing while said test data packet signal power is provided iteratively at alternating incrementally higher and lower power levels, at least once on a packet-by-packet basis, to produce, as a function of successive ones of said received pluralities of response data packets and corresponding ones of said pluralities of test data packets, a plurality of subsequent test PERs by decreasing said PWR after computing a test PER lower than a predetermined one of said plurality of intermediate PERs at one of said plurality of intermediate PWRs and increasing said PWR after computing a test PER higher than said predetermined one of said plurality of intermediate PERs, wherein said PER as a function of said PWR defines a non-linear modulation curve having
a maximum PER versus PWR variation at said predetermined one of said plurality of intermediate PERs, and
PER versus PWR variations less than said maximum PER versus PWR variation at remaining ones of said plurality of intermediate PERs higher and lower than said predetermined one of said plurality of intermediate PERs; and
terminating said repeating said providing, receiving and computing in response to said plurality of subsequent test PERs including at least one of
a measured test PER substantially equal to said predetermined one of said plurality of intermediate PERs, or
at least one higher test PER and one lower test PER than said predetermined one of said plurality of intermediate PERs.
8. The method of claim 7 , wherein said predetermined one of said plurality of intermediate PERs is substantially equal to 50 percent.
9. The method of claim 7 , wherein:
said predetermined one of said plurality of intermediate PERs corresponds to a target one of said plurality of intermediate PWRs; and
said receiving, with a data packet signal transceiver device under test (DUT), a test data packet signal having a test data packet signal power comprises receiving said test data packet signal having an initial test data packet signal power less than said target one of said plurality of intermediate PWRs.
10. The method of claim 9 , wherein said predetermined one of said plurality of intermediate PERs is substantially equal to 50 percent.
11. The method of claim 7 , wherein:
said predetermined one of said plurality of intermediate PERs corresponds to a target one of said plurality of intermediate PWRs; and
said receiving, with a data packet signal transceiver device under test (DUT), a test data packet signal having a test data packet signal power comprises receiving said test data packet signal having an initial test data packet signal power greater than said target one of said plurality of intermediate PWRs.
12. The method of claim 11 , wherein said predetermined one of said plurality of intermediate PERs is substantially equal to 50 percent.
13. The method of claim 1 , further comprising repeating said providing, receiving and computing further until said plurality of test data packets includes a predetermined minimum number of test data packets.
14. The method of claim 1 , further comprising repeating said providing, receiving and computing further until said one or more response data packets includes a predetermined minimum number of response data packets.
15. The method of claim 7 , further comprising repeating said receiving, providing and computing further until said plurality of test data packets includes a predetermined minimum number of test data packets.
16. The method of claim 7 , further comprising repeating said receiving, providing and computing further until said one or more response data packets includes a predetermined minimum number of response data packets.