Method of using SNR to reduce factory test time
First Claim
1. A method of testing receiver sensitivity in a radio frequency (RF) device comprising:
- (a) selecting a new test quantity to replace a known receiver sensitivity test parameter;
(b) determining the relationship between said known receiver sensitivity test parameter and said new test quantity;
(c) determining a new test criteria based on said new test quantity in accordance with a defined standard; and
(d) conducting a receiver sensitivity test using said new test quantity and said new test criteria. wherein said new test quantity has a predetermined and monotonic relationship with said known receiver sensitivity test parameter, and wherein said new test quantity is read from a baseband processor associated with said RF device, and wherein said step of determining a new test criteria comprises;
(i) obtaining a plurality of said known receiver sensitivity test parameter measurements and corresponding values of said new test quantity at each of a plurality of received signal strengths;
(ii) calculating at each of said plurality of received signal strength levels an average value of said plurality of said known receiver sensitivity test parameter measurements;
(iii) plotting the averages of N-sample groups of said corresponding values of said new test quantity versus said calculated average values of said plurality of said known receiver sensitivity test parameter measurements and determining targeted confidence level probability points from said plot, (iv) interpolating between said targeted confidence level probability points for different ones of said plurality of received signal strength levels; and
(v) determining a pass/fail threshold for said new test quantity which corresponds to a pass/fail criteria associated with said defined test standard.
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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
21 Claims
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1. A method of testing receiver sensitivity in a radio frequency (RF) device comprising:
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(a) selecting a new test quantity to replace a known receiver sensitivity test parameter;
(b) determining the relationship between said known receiver sensitivity test parameter and said new test quantity;
(c) determining a new test criteria based on said new test quantity in accordance with a defined standard; and
(d) conducting a receiver sensitivity test using said new test quantity and said new test criteria. wherein said new test quantity has a predetermined and monotonic relationship with said known receiver sensitivity test parameter, and wherein said new test quantity is read from a baseband processor associated with said RF device, and wherein said step of determining a new test criteria comprises;
(i) obtaining a plurality of said known receiver sensitivity test parameter measurements and corresponding values of said new test quantity at each of a plurality of received signal strengths;
(ii) calculating at each of said plurality of received signal strength levels an average value of said plurality of said known receiver sensitivity test parameter measurements;
(iii) plotting the averages of N-sample groups of said corresponding values of said new test quantity versus said calculated average values of said plurality of said known receiver sensitivity test parameter measurements and determining targeted confidence level probability points from said plot, (iv) interpolating between said targeted confidence level probability points for different ones of said plurality of received signal strength levels; and
(v) determining a pass/fail threshold for said new test quantity which corresponds to a pass/fail criteria associated with said defined test standard. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for testing receiver sensitivity in a radio frequency (RF) device comprising:
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(a) a wireless communications test set;
(b) a device under test (DUT) communicating with said wireless communications test set, wherein a simulated traffic signal is forwarded from said wireless communications test set to said DUT, and wherein a receiver sensitivity test is conducted based on a test criteria in a accordance with a defined standard, said test criteria based on a predetermined relationship between a known receiver sensitivity test parameter and a new test quantity, and wherein said DUT comprises a baseband processor, and wherein said baseband processor comprises a channel estimator for estimating said new test quantity associated with said simulated traffic signal, and wherein said estimated new test quantity is amplitude. - View Dependent Claims (14, 15, 16, 17, 18)
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- 19. A modulated carrier wave generated by a wireless communication test set and received by a device under test (DUT), wherein said modulated carrier wave embodies a data signal representing a simulated traffic signal in a wireless network, and wherein a receiver sensitivity test is conducted based on a test criteria in accordance with a defined standard, and wherein said test criteria based on a predetermined relationship between a known receiver sensitivity test parameter and a new test quantity, and wherein said new test quantity is associated with a quality level of said received modulated carrier wave, and wherein said new test quantity is determined at a digital processing portion of said DUT, and wherein said new test quantity has a predetermined and monotonic relationship with said known receiver sensitivity test parameter, and wherein said new test quantity is read from a digital baseband processor associated with said RF device.
Specification