Radio paging device with improved test modes

• US 4,649,538 A
• Filed: 10/03/1984
• Issued: 03/10/1987
• Est. Priority Date: 09/28/1984
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: DeLuca, Michael J., Siegel, William G.
• Primary Examiner(s): Fleming, Michael R.
• Application Number:
  US06/657,425
• Time in Patent Office: 888 Days
• Field of Search: 371/22, 371/25, 371/5, 371/15, 179/175, 179/175.31 R, 340/146.1 E, 340/146.1 C, 375/8, 375/9, 375/10, 455/226, 364/514
• US Class Current: 714/735
• CPC Class Codes: G08B 3/1066 with other provisions not elsewhere provided for, e.g. turn-off protection
• CPC Class Codes: H04B 17/20 of receivers
• CPC Class Codes: H04B 17/29 Performance testing
• CPC Class Codes: H04W 24/06 Testing, supervising or monitoring using simulated traffic
• CPC Class Codes: H04W 88/022 Selective call receivers

Abstract

A radio paging test system for testing the sensitivity of a radio receiver which receives a group of transmitted signals from a transmitter. Each transmitted signal in the group of transmitted signals is detected ad then compared to a reference signal to determine the degree of similarity between the reference signal and the detected signal. Each detected signal is classified either as a missed page, a non-page or a decoded page depending on the degree of similarity between the detected signal and the reference signal. In one mode of operation the classification of each detected signal is indicated by a classification signal which may be utilized to activate an alert such as a transducer or LED. Each classification signal may be directed to a computer input for analysis. In another mode of operation the classification signals are further analyzed to determine if the pager sensitivity is above, below or at a predetermined level. An alert indicating the pager sensitivity is then generated.

Claims

1. A method of testing a receiver capable of receiving at least one group of transmitted signals, said method comprising the steps of:

transmitting at least one group of signals of a plurality of groups to the receiver, the at least one group of signals including at least one test code;

detecting at the receiver the transmitted signals;

decoding each group of transmitted signals for producing a decoded signal, each decoded signal including a decoded test code;

comparing the decoded test code of each said decoded signal with a reference signal having a test code identical to the transmitted test code to determine the degree of similarly between each said decoded signal and said reference signal;

classifying into at least three classifications of said decoded signal in accordance with the difference between the decoded test code and the identical test code of said reference signal;

generating a signal indicative of the classification of each of the decoded signals.

2. A method, according to claim 1, further comprising the step of:

generating an alert in response to each of said classification signal such that the classification of each of the detected signals is discernible.

3. The method, according to claim 2, wherein said step of comparing each of the decoded signals, each said decoder signal being comprised of at least one symbol, includes the step of:

determining the number of non-corresponding symbols between each said decoded signal and said reference signal whereby each said decoded signal may be classified in accordance with the number of non-corresponding symbols.

4. The method, according to claim 3, wherein the step of generating an alert includes the step of:

varying the frequency of said alert whereby each different frequency of said alert represents a respective classification for at least one of said decoded signals.

5. The method, according to claim 3, wherein step of generating an alert includes the step of:

varying the duration of said alert whereby each different duration of said alert represents a respective classification for at least one of said decoded signals.

6. The method, according to claim 2, wherein the step of generating an alert includes the step of:

varying the frequency of said alert whereby each different frequency of said alert represents a respective classification for at least one of said decoded signals.

7. The method, according to claim 2, wherein step of generating an alert includes the step of:

varying the duration of said alert whereby each different duration of said alert represents a respective classification for at least one of said decoded signals.

8. The method, according to claim 1, wherein said step of comparing each of the decoded signals, each said decoded signal being comprised of at least one symbol, includes the step of:

determining the number of non-corresponding symbols between each said decoded signal and said reference signal whereby each said decoded signal may be classified in accordance with the number of non-corresponding symbols.

9. A receiver capable of receiving at least one group of transmitted signals, each said transmitted signal being comprised of at least one symbol, comprising:

detecting and decoding means, for detecting and decoding each said transmitted signal from said at least one group of transmitted signals to obtain a decoded signal;

memory means, for storing a reference signal having a reference symbol identical to the transmitted symbol;

comparing means, coupled to said detecting and decoding means and said memory means, for comparing the symbol for each said decoded signal with reference symbol of said reference signal and for generating a signal indicative of the degree of similarly between each said decoded signal and said reference signal;

classifying means, coupled to said comparing means, for classifying into at least three classifications each of the decoded signals, for generating a signal indicative of the classifications of each said decoded signal.

10. The receiver, according to claim 9, further comprising:

alert means, coupled to said classifying means, for generating an alert in response to said classification signal.

11. The receiver, according to claim 9, wherein:

said comparing means compares each symbol of said decoded signal with a corresponding symbol of said reference signal and generates a signal indicative of the number of dissimilar symbols between said decoded signal and said reference signal.

12. The receiver, according to claim 11, wherein:

said classifying means generates said classification signal in accordance with the number of dissimilar symbols between said decoded signal and said reference signal.

13. A method for evaluating the performance of a receiver capable of receiving at least one group of signals, said method comprising the steps of

(a) transmitting at least one group of signals of a plurality of groups to the receiver, that at least one group of signals including at least one predetermined bit pattern;

(b) receiving at the receiver the group of signals;

(c) decoding each group of signals to recover each bit pattern;

(d) comparing each of the decoded bit pattern bit by bit to a reference bit pattern identical to the predetermined bit pattern for determining the number of bit differences;

(e) classifying into a plurality of error conditions, the decoded signal according to the number of bit differences; and

(f) generating a value for each of the error conditions to evaluate the performance of the receiver.

14. The method of claim 13 further comprising the steps of:

generating an alert in response to each of the error condition values.

15. The method of claim 14 further comprising the step of:

varying the frequency of the alert whereby each different frequency of the alert represents a corresponding error condition value for each decoded signal.

16. The method of claim 13 comprising the step of:

varying the duration of the alert whereby each different duration of the alert represents a respective error condition for at least one of the decoded signals.

17. The method of claim 13 wherein the step (d) of comparing further includes the steps of:

(g) comparing the decoded bit pattern bit by bit to a plurality of reference bit patterns for determining a plurality of errors values, each error value indicative of the number of bit differences;

(h) selecting from the plurality of error values, the error value with the least number of bit differences.

18. The method of claim 13 further including the steps of:

(i) repeating from step (a) of transmitting through step (f) of generating until the values for a select number of the plurality of error conditions reach a predetermined limit;

(j) classifying the plurality of error conditions into a plurality of classifications according to a predetermined statistical determination; and

(k) generating a value for each of the classifications to evaluate a sensitivity for the receiver.

19. The method of claim 18 wherein step (k) of classifying further includes the steps of:

(1) determining a ratio for each error condition value compared to a total for the error condition values; and

(m) classifying the ratios into the plurality of classification values.

20. The method of claim 18 further comprising the step of:

generating an alert in response to each of the classification values.

21. The method of claim 20 further comprising the step of:

varying the frequency of the alert whereby each different frequency of the alert signal represents a corresponding classification value.

22. The method of claim 18 comprising the step of:

varying the duration of the alert whereby each different duration of the alert represents a respective classification value for the receiver.