Method of using SNR to reduce factory test time
First Claim
1. A method of conducting a receiver sensitivity test of a radio frequency (RF) device, said method comprising:
- waiting a defined settling time;
forwarding a simulated traffic signal to said RF device;
obtaining N samples at a baseband processor associated with said RF device of a new test quantity of said simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard;
calculating an average of said N samples; and
comparing said calculated average with new test criteria for said new test quantity which corresponds to a pass/fail criteria of said defined test standard for said known receiver sensitivity test parameter, wherein said new test criteria achieves a defined missed detection rate and a defined false alarm rate.
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Accused Products
Abstract
The application relates to wireless networks and more particularly to a method of reducing factory test time of receiver sensitivity in a Code Division Multiple Access (CDMA) wireless device. Under TIA/EIA/-98E, the radio frequency (RF) sensitivity of a CDMA wireless receiver is the minimum received power, measured at the mobile station antenna connector, at which the frame error rate (FER) does not exceed 0.5% with 95% confidence. In order to reduce the test time of FER test method, the relation between correlated energy (or Ec/Io) and FER is determined using simulated traffic and the correlated energy (or Ec/Io) measurement is then used as the test parameter on like models to achieve the same or superior test confidence with significantly reduced test time.
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Citations
35 Claims
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1. A method of conducting a receiver sensitivity test of a radio frequency (RF) device, said method comprising:
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waiting a defined settling time; forwarding a simulated traffic signal to said RF device; obtaining N samples at a baseband processor associated with said RF device of a new test quantity of said simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard; calculating an average of said N samples; and comparing said calculated average with new test criteria for said new test quantity which corresponds to a pass/fail criteria of said defined test standard for said known receiver sensitivity test parameter, wherein said new test criteria achieves a defined missed detection rate and a defined false alarm rate. - View Dependent Claims (2, 3, 4, 5, 8, 9, 16)
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6. A method of conducting a receiver sensitivity test of a radio frequency (RF) device, said method comprising:
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waiting a defined settling time; forwarding a simulated traffic signal to said RF device; performing at least one iteration of a predefined number of iterations of testing wherein each iteration of testing comprises; obtaining a multiple, determined by a current iteration, of N samples at a baseband processor associated with said RF device of a new test quantity of said simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard; calculating a current average of said new test quantity from a current total number of samples obtained during said receiver sensitivity test up to and including said current iteration; and determining said RF device has passed said receiver sensitivity test and that no further iterations are to be performed in a case where said calculated current average is greater than a specified new test quantity threshold, wherein said specified new test quantity threshold is defined for a number of samples corresponding to said current total number of samples obtained and corresponds to a performance threshold and a defined confidence level for said known receiver sensitivity test parameter according to a pass/fail criteria of said defined test standard; and determining that another iteration is to be performed in a case where said calculated current average is less than said specified new test quantity threshold; determining said RF device has failed in a case where after said predefined number of iterations said RF device has not been determined to have passed said receiver sensitivity test. - View Dependent Claims (10, 12, 14)
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7. A method of conducting a receiver sensitivity test of a radio frequency (RF) device, said method comprising:
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waiting a defined settling time; forwarding a simulated traffic signal to said RF device; performing at least one iteration of a predefined number of iterations of testing wherein each iteration of testing comprises; obtaining a multiple, determined by a current iteration, of N samples at a baseband processor associated with said RF device of a new test quantity of said simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard; calculating a current average of said new test quantity from a current total number of samples obtained during said receiver sensitivity test up to and including said current iteration; determining said RF device has passed said receiver sensitivity test and that no further iterations are to be performed in a case where said calculated current average is greater than a specified new test quantity upper threshold, wherein said specified new test quantity upper threshold is defined for a number of samples corresponding to said current total number of samples obtained and corresponds to an upper limit for a performance threshold and a defined confidence level for said known receiver sensitivity test parameter according to a pass/fail criteria of said defined test standard; and determining said RF device has failed said receiver sensitivity test and that no further iterations are to be performed in a case where said calculated current average is less than a specified new test quantity lower threshold, wherein said specified new test quantity lower threshold is defined for a number of samples corresponding to said current total number of samples obtained and corresponds to a lower limit of a performance threshold and a defined confidence level for said known receiver sensitivity test parameter according to said pass/fail criteria of said defined test standard; determining that another iteration is to be performed in a case where said calculated current average is less than said specified new test quantity upper threshold and greater than said specified new test quantity lower threshold; determining said RF device has failed in a case where after said predefined number of iterations said RF device has not been determined to have passed said receiver sensitivity test. - View Dependent Claims (11, 13, 15)
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17. A system for conducting a receiver sensitivity test of a radio frequency (RF) device under test (DUT), the system comprising:
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said DUT being a base station operating within a wireless network, said DUT having a baseband processor and for obtaining N samples at said baseband processor of a new test quantity of a simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard; and a wireless communications test set for forwarding said simulated traffic signal to said DUT, for receiving and calculating an average of said N samples; and
for comparing said calculated average with new test criteria for said new test quantity which corresponds to a pass/fail criteria of said defined test standard for said known receiver sensitivity test parameter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 27, 28, 35)
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25. A system for conducting a receiver sensitivity test of a radio frequency (RF) device under test (DUT), the system comprising:
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said DUT having a baseband processor and for obtaining samples at said baseband processor of a new test quantity of a simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard; and a wireless communications test set for forwarding said simulated traffic signal to said DUT, for receiving and calculating averages of said samples, wherein said DUT and said wireless communications test set are for performing at least one iteration of a predefined number of iterations of testing wherein each iteration of testing comprises; said DUT obtaining a multiple, determined by a current iteration, of N samples at said baseband processor of said new test quantity of said simulated traffic signal; said wireless communications test set receiving from said DUT said multiple of N samples and calculating a current average of said new test quantity from a current total number of samples obtained during said receiver sensitivity test up to and including said current iteration, determining said DUT has passed said receiver sensitivity test and that no further iterations are to be performed in a case where said calculated current average is greater than a specified new test quantity threshold, wherein said specified new test quantity threshold is defined for a number of samples corresponding to said current total number of samples obtained and corresponds to a performance threshold and a defined confidence level for said known receiver sensitivity test parameter according to a pass/fail criteria of said defined test standard, and determining that another iteration is to be performed in a case where said calculated current average is less than said specified new test quantity threshold, and, wherein said wireless communications test set is further for determining that said DUT has failed in a case where after said predefined number of iterations said DUT has not been determined to have passed said receiver sensitivity test. - View Dependent Claims (29, 31, 33)
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26. A system for conducting a receiver sensitivity test of a radio frequency (RF) device under test (DUT), the system comprising:
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said DUT having a baseband processor and for obtaining samples at said baseband processor of a new test quantity of a simulated traffic signal, wherein said new test quantity has a predetermined and monotonic relationship with a known receiver sensitivity test parameter of a defined test standard; and a wireless communications test set for forwarding said simulated traffic signal to said DUT, for receiving and calculating averages of said samples, wherein said DUT and said wireless communications test set are for performing at least one iteration of a predefined number of iterations of testing wherein each iteration of testing comprises; said DUT obtaining a multiple, determined by a current iteration, of N samples at said baseband processor of said new test quantity of said simulated traffic signal; said wireless communications test set receiving from said DUT said multiple of N samples and calculating a current average of said new test quantity from a current total number of samples obtained during said receiver sensitivity test up to and including said current iteration, determining said DUT has passed said receiver sensitivity test and that no further iterations are to be performed in a case where said calculated current average is greater than a specified new test quantity upper threshold, wherein said specified new test quantity upper threshold is defined for a number of samples corresponding to said current total number of samples obtained and corresponds to an upper limit for a performance threshold and a defined confidence level for said known receiver sensitivity test parameter according to a pass/fail criteria of said defined test standard, determining said DUT has failed said receiver sensitivity test and that no further iterations are to be performed in a case where said calculated current average is less than a specified new test quantity lower threshold, wherein said specified new test quantity lower threshold is defined for a number of samples corresponding to said current total number of samples obtained and corresponds to a lower limit of a performance threshold and a defined confidence level for said known receiver sensitivity test parameter according to said pass/fail criteria of said defined test standard, and determining that another iteration is to be performed in a case where said calculated current average is less than said specified new test quantity upper threshold and greater than said specified new test quantity lower threshold, wherein said wireless communications test set is further for determining said DUT has failed in a case where after said predefined number of iterations said DUT has not been determined to have passed said receiver sensitivity test. - View Dependent Claims (30, 32, 34)
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Specification