System and method for characterizing error correction performance for digital data transport over an IP network

• US 7,788,568 B1
• Filed: 01/23/2006
• Issued: 08/31/2010
• Est. Priority Date: 01/23/2006
• Status: Active Grant

• Current Assignee: T-Mobile Innovations LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Communications Company LP (Deutsche Telekom AG)
• Inventors: Black, Jim, Huang, Renxiang, Lima, Claudio
• Primary Examiner(s): RIZK, SAMIR WADIE
• Application Number:
  US11/337,367
• Time in Patent Office: 1,681 Days
• Field of Search: 714/774, 714/746, 714/752, 714/781, 709/224
• US Class Current: 714/774
• CPC Class Codes: H03M 13/01 Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
• CPC Class Codes: H03M 13/015 Simulation or testing of codes, e.g. bit error rate [BER] measurements
• CPC Class Codes: H03M 13/098 using single parity bit
• CPC Class Codes: H03M 13/15 Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes H03M13/17 takes precedence
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/3738 with judging correct decoding

Abstract

A method for characterizing performance of an error correction scheme for digital data transport is provided. A digital data packet stream within an Internet Protocol packet stream is monitored for a first set of packet errors. Errors of the Internet Protocol packet stream are corrected according to the error correction scheme to produce a corrected Internet Protocol packet stream. The digital data packet stream within the corrected Internet Protocol packet stream is monitored for a second set of packet errors. The first and second sets of packet errors are compared to characterize the performance of the error correction scheme.

Claims

1. A method for characterizing performance of an error correction scheme for transport of digital video data, comprising:

monitoring a digital video data packet stream comprising transport stream packets of the digital video data within an Internet Protocol packet stream for a first set of continuity count errors of the transport stream packets;

correcting errors of the Internet Protocol packet stream according to the error correction scheme, thus producing a corrected Internet Protocol packet stream;

monitoring the digital data packet stream within the corrected Internet Protocol packet stream for a second set of continuity count errors of the transport stream packets; and

comparing the first set of continuity count errors and the second set of continuity count errors to characterize the performance of the error correction scheme.

2. The method of claim 1, wherein correcting errors of the Internet Protocol Packet stream comprises decoding error correction packets within the Internet Protocol packet stream to correct the errors in the Internet Protocol packet stream.

3. The method of claim 1, wherein the transport stream packets are encoded under Motion Picture Experts Group Standard 2.

4. The method of claim 1, wherein the continuity count errors comprise an incorrect order of the transport stream packets.

5. The method of claim 1, wherein the continuity count errors comprise a missing transport stream packet.

6. The method of claim 1, wherein the continuity count errors comprise a duplicate transport stream packet.

7. The method of claim 1, wherein comparing the first set of packet errors and the second set of packet errors comprises:

calculating an Internet Protocol packet loss ratio of the Internet Protocol packet stream using the first set of packet errors;

calculating a corrected Internet Protocol packet loss ratio of the corrected Internet Protocol packet stream using the second set of packet errors; and

calculating a ratio of the Internet Protocol packet loss ratio and the corrected Internet Protocol packet loss ratio to characterize the performance of the error correction scheme.

8. The method of claim 1, wherein the Internet Protocol packet stream comprises a Real-time Transport Protocol over Internet Protocol packet stream.

9. The method of claim 1, wherein the Internet Protocol packet stream comprises a User Datagram Protocol over Internet Protocol packet stream.

10. The method of claim 1, further comprising:

generating a digital video input signal;

encoding the digital video input signal into the digital video packet stream within the Internet Protocol packet stream;

encoding the Internet Protocol packet stream according to the error correction scheme;

carrying the Internet Protocol packet stream over an Internet Protocol network; and

decoding the corrected Internet Protocol packet stream to generate a digital video output signal.

11. The method of claim 10, wherein the Internet Protocol network comprises an Internet Protocol network emulator.

12. The method of claim 10, further comprising:

displaying a graphic representation of the digital video input signal; and

displaying a graphic representation of the digital video output signal.

13. A digital storage medium comprising instructions executable on a processor for employing the method of claim 1.

14. A system for characterizing performance of an error correction scheme for transport of digital video data, comprising:

a first digital video data tester configured to monitor a digital data packet stream comprising transport stream packets of the digital video data within an Internet Protocol packet stream for a first set of continuity count errors of the transport stream packets;

an error correction decoder configured to correct errors of the Internet Protocol packet stream according to the error correction scheme, thus producing a corrected Internet Protocol packet stream;

a second digital video data tester configured to monitor the digital data packet stream within the corrected Internet Protocol packet stream for a second set of continuity count errors of the transport stream packets; and

a processor configured to compare the first set of continuity count errors and the second set of continuity count errors to characterize the performance of the error correction scheme.

15. The system of claim 14, wherein the error correction decoder is further configured to decode error correction packets within the Internet Protocol packet stream to correct the errors in the Internet Protocol packet stream.

16. The system of claim 14, wherein the transport stream packets of the digital video data are encoded under Motion Picture Experts Group Standard 2.

17. The system of claim 14, wherein the continuity count errors comprise an incorrect order of the transport stream packets.

18. The system of claim 14, wherein the continuity count errors comprise a missing transport stream packet.

19. The system of claim 14, wherein the continuity count errors comprise a duplicate transport stream packet.

20. The system of claim 14, wherein the processor is further configured to:

calculate an Internet Protocol packet loss ratio of the Internet Protocol packet stream using the first set of packet errors;

calculate a corrected Internet Protocol packet loss ratio of the corrected Internet Protocol packet stream using the second set of packet errors; and

calculate a ratio of the Internet Protocol packet loss ratio and the corrected Internet Protocol packet loss ratio to characterize the performance of the error correction scheme.

21. The system of claim 14, wherein the Internet Protocol packet stream comprises a Real-time Transport Protocol over Internet Protocol packet stream.

22. The system of claim 14, wherein the Internet Protocol packet stream comprises a User Datagram Protocol over Internet Protocol packet stream.

23. The system of claim 14, further comprising:

a video source configured to generate a digital video input signal;

a video encoder configured to encode the digital video input signal into the digital video packet stream within the Internet Protocol Packet stream;

an error correction encoder configured to encode the Internet Protocol packet stream according to the error correction scheme;

an Internet Protocol network configured to carry the Internet Protocol packet stream to the first digital data tester; and

a video decoder coupled with the error correction decoder, the video decoder being configured to decode the corrected Internet Protocol packet stream to generate a digital video output signal.

24. The system of claim 23, wherein the Internet Protocol network comprises an Internet Protocol network emulator coupled to the error correction encoder by way of a first Ethernet connection and to the second digital data tester by way of a second Ethernet connection.

25. The system of claim 23, further comprising:

a first video display coupled with the video source and configured to display a graphic representation of the digital video input signal; and

a second video display coupled with the video decoder and configured to display a graphic representation of the digital video output signal.

26. A system for characterizing performance of an error correction scheme for transport of digital video data, comprising:

means for monitoring a digital video data packet stream comprising transport stream packets of the digital video data within an Internet Protocol packet stream for a first set of continuity count errors of the transport stream packets;

means for correcting errors of the Internet Protocol packet stream according to the error correction scheme, thus producing a corrected Internet Protocol packet stream;

means for monitoring the digital data packet stream within the corrected Internet Protocol packet stream for a second set of continuity count errors of the transport stream packets; and

means for comparing the first set of continuity count errors and the second set of continuity count errors to characterize the performance of the error correction scheme.