ACM AWARE ENCODING SYSTEMS AND METHODS

• US 20080144713A1
• Filed: 12/13/2007
• Published: 06/19/2008
• Est. Priority Date: 12/13/2006
• Status: Abandoned Application

• Current Assignee: ViaSat Incorporated
• Original Assignee: ViaSat Incorporated
• Inventors: Kimmich, Kevin D., Vanderaar, Mark, Mo, Fan
• Application Number:
  US11/956,200
• Publication Number:
  US 20080144713A1
• Time in Patent Office: Days
• US Class Current: 375/240.02
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0014 by adapting the source coding
• CPC Class Codes: H04L 2001/0098 Unequal error protection
• CPC Class Codes: H04N 19/162 User input
• CPC Class Codes: H04N 19/164 Feedback from the receiver or from the transmission channel
• CPC Class Codes: H04N 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/66 involving data partitioning, i.e. separation of data into packets or partitions according to importance
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/6143 involving transmission via a satellite
• CPC Class Codes: H04N 21/6193 involving transmission via a satellite arrangements for data linking, networking or transporting, or for controlling an end to end session in a satellite broadcast system H04B7/18526

Abstract

Methods, systems, and devices are described for hierarchical communication of a set of source data over a communication link. Sets of representation data may be generated by applying precoding schemes to a set of source data. The sets of representation data may be associated with coding and modulation schemes of varying order. Based on certain link conditions, the sets of representation data may be adaptively coded and modulated, using their associated coding and modulation schemes, for transmission over a communication link.

Claims

1. A system for hierarchical representation of a set of source data in a satellite environment using adaptive coding and modulation, the system comprising:

a gateway comprising;

a receiver unit configured to receive a set of source data;

a precoder unit, communicatively coupled with the receiver unit, and configured to;

precode at least a subset of the set of source data using a first precoding scheme to generate a first set of representation data, decodable independently to provide a set of first-level playback data representing the set of source data; and

precode at least a subset of the set of source data using a second precoding scheme to generate a second set of representation data, decodable in combination with the first set of representation data to provide a set of second-level playback data representing the set of source data;

an adaptive coding and modulation unit, communicatively coupled with the precoder unit, and configured to associate the first set of representation data with a first coding and modulation scheme and to associate the second set of representation data with a second coding and modulation scheme, wherein the second coding and modulation scheme is of a higher order than the first coding and modulation scheme; and

a transceiver unit, communicatively coupled with the adaptive coding and modulation unit, and configured to transmit a signal over a communication link, the signal relating to applying the first coding and modulation scheme to the first set of representation data and applying the second coding and modulation scheme to the second set of representation data; and

a subscriber terminal, configured to;

receive the signal from the communication link;

decode, in a first mode, the first set of representation data from the signal to generate the set of first-level playback data representing the set of source data; and

decode, in a second mode, a combination of the first set of representation data and the second set of representation data from the signal to generate the set of second-level playback data representing the set of source data.

2. The system of claim 1, wherein the gateway further comprises:

a profiler unit, communicatively coupled with the adaptive coding and modulation unit, and configured to determine a profile relating at least in part to a set of conditions for the communication link,

wherein the adaptive coding and modulation unit is further configured, based at least in part on the profile, to associate the first set of representation data with the first coding and modulation scheme and associate the second set of representation data with the second coding and modulation scheme.

3. The system of claim 1, wherein:

the source data comprises audio-visual data; and

the set of first-level playback data is of a lower resolution than the set of second level playback data.

4. A device for hierarchical communication of a set of source data over a communication link, the device comprising:

a representation data store, configured to store sets of representation data comprising;

a first set of representation data generated by a first precoding scheme, and formatted to be decoded independently to provide a set of first-level playback data representing the set of source data; and

a second set of representation data generated by a second precoding scheme, and formatted to be decoded to provide a set of second-level playback data representing the set of source data when combined with the first set of representation data, wherein the second precoding scheme is different from the first precoding scheme;

an identifier data store, configured to store a set of identifiers, each identifier representing one of a set of coding and modulation schemes for data transmission over the communication link; and

a processor unit, communicatively coupled with the representation data store and the identifier data store, and configured to;

associate at least one of the sets of representation data with at least a first coding and modulation scheme from the set of coding and modulation schemes represented by a first identifier; and

associate at least another of the sets of representation data with at least a second coding and modulation scheme from the set of coding and modulation schemes represented by a second identifier, the second coding and modulation scheme being of a higher order than the first coding and modulation scheme.

5. The device of claim 4, further comprising:

a transmitter unit, communicatively coupled with the processor unit, and configured to transmit a signal over a communication link, the signal relating at least to applying the first coding and modulation scheme to the first set of representation data.

6. The device of claim 4, further comprising:

a precoder unit, communicatively coupled with the processor unit, and configured to precode at least a portion of the set of source data using at least one precoding scheme to generate at least one of the sets of representation data,

wherein the processor unit is further configured to control at least a portion of a set of precoding parameters used by the precoder unit to precode the set of source data into the at least one of the sets of representation data using the at least one precoding scheme.

7. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to a set of conditions for at least one of the communication link, a gateway, or a plurality of subscriber terminals,

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the profile.

8. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to the signal-to-noise ratio of signals received by at least one of a gateway side of the communication link or a subscriber terminal side of the communication link,

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the profile.

9. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to;

receive an audience metric relating to at least one characteristic of an audience of the set of source data; and

determine a profile relating at least in part to the audience metric,

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the profile.

10. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to the bandwidth of the communication link,

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the profile.

11. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to the signal-to-noise ratio of signals received by a plurality of subscriber terminals, the plurality of subscriber terminals being configured to receive data over the communication link; and

the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the profile.

12. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to a set of conditions for at least a portion of a plurality of subscriber terminals,

wherein at least one of the subscriber terminals comprises a receiver, the receiver having a receiving capability, and

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the receiving capability of the receiver.

13. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to a set of conditions for a subscriber terminal,

wherein the subscriber terminal is associated with a subscriber account, the subscriber account comprising entitlement information, and

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on the entitlement information.

14. The device of claim 4, further comprising:

a profiler unit, communicatively coupled with the processor unit, and configured to determine a profile relating at least in part to a set of conditions for a communication link,

wherein the communication link carries data comprising a multicast data stream subscribed to by a subset of subscriber terminals, and

wherein the processor unit is further configured to associate one or more of the sets of representation data with the set of identifiers based at least in part on characteristics of the subset of subscriber terminals that have subscribed to the multicast.

15. The device of claim 4, wherein:

the unique coding and modulation scheme defined by the first identifier has a same coding scheme as the unique coding and modulation scheme defined by the second identifier; and

the unique coding and modulation scheme defined by the first identifier has a different modulation scheme from the unique coding and modulation scheme defined by the second identifier.

16. The device of claim 4, further comprising:

a multiplexer unit configured to multiplex at least a portion of the first set of representation data and the second set of representation data to generate an output dataset.

17. The device of claim 4, wherein the first precoding scheme comprises a at least one of a scalable precoding scheme or a data partitioning scheme.

18. A method for hierarchical communication of a set of source data over a communication link, the method comprising:

receiving a first set of representation data generated by a first precoding scheme, wherein at least a subset of the first set of representation data is formatted to be decoded independently to provide a set of first-level playback data representing the set of source data;

receiving a second set of representation data generated by a second precoding scheme, wherein at least a subset of the second set of representation data is formatted to be decoded to provide a set of second-level playback data representing the set of source data when combined with the first set of representation data, and wherein the second coding scheme is different from the first coding scheme;

associating a first coding and modulation scheme with the first set of representation data

19. The method of claim 18, further comprising:

associating a second coding and modulation scheme with the second set of representation data, the second coding and modulation scheme being of a higher order than the first coding and modulation scheme.

20. The method of claim 18, further comprising:

precoding at least a portion of the set of source data into the first set of representation data using the first precoding scheme.

21. The method of claim 18, further comprising:

determining a profile relating to conditions of at least one of the communication link, a gateway, or a subscriber terminal,

wherein at least one of the associating steps is based at least in part on the profile.

22. A method for receiving hierarchical communication of a set of source data over a communication link, the method comprising:

receiving, from the communication link, at least a portion of a first signal generated by applying a first precoding scheme and a first coding and modulation scheme to the set of source data, and comprising a first set of representation data formatted to be decoded independently to provide a set of first-level playback data representing the set of source data;

receiving, from the communication link, at least a portion of a second signal generated by applying a second precoding scheme and a second coding and modulation scheme to the set of source data, and comprising a second set of representation data formatted to be decoded to provide a set of second-level playback data representing the set of source data when combined with the first set of representation data;

decoding, in a first mode, the first set of representation data to generate the set of first-level playback data representing the set of source data; and

decoding, in a second mode, a combination of the first set of representation data and the second set of representation data to generate the set of second-level playback data representing the set of source data.

23. The method of claim 22, further comprising:

detecting a signal quality level relating to a signal quality of the portion of the second signal received from the communication link;

automatically entering the second mode when the signal quality level exceeds a threshold; and

automatically entering the first mode when the signal quality level does not exceed the threshold.

24. The method of claim 23, wherein detecting the signal quality level comprises detecting at least one of a signal-to-noise ratio or a bit error rate of the portion of the second signal received from the communication link.

25. The method of claim 22, further comprising:

storing at least a portion of the first set of representation data in relation to a source data pointer; and

storing at least a portion of the second set of representation data in relation to the source data pointer.

26. A device for hierarchical communication of a set of source data over a communication link, the device comprising:

a means for storing sets of representation data comprising;

a first set of representation data generated by a first precoding scheme, and formatted to be decoded independently to provide a set of first-level playback data representing the set of source data;

a second set of representation data generated by a second precoding scheme, and formatted to be decoded to provide a set of second-level playback data representing the set of source data when combined with the first set of representation data;

a means for storing a set of identifiers, each identifier representing one of a set of coding and modulation schemes for data transmission over the communication link, the set of coding and modulation schemes comprising;

a first coding and modulation scheme is represented by a first identifier; and

a second coding and modulation scheme represented by a second identifier, the second coding and modulation scheme being of a higher order than the first coding and modulation scheme; and

a means for associating each of at least a subset of the sets of representation data with at least one of the set of identifiers.