Error detection/correction coding for hierarchical QAM transmission systems
AssigneeThomson Licensing
InventorsTimothy Forrest Settle, Thomas Peter Krauss, Kumar Ramaswamy
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Abstract
The power of the respective codes used by the first and second error detection/correction circuitry are such that the coded bit error rate of the first data stream is more closely matched to the coded bit error rate of the second data stream. A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. The hierarchical QAM transmitter encodes the first data stream using a code having a first detection/correction power and encodes the second data stream using a code having a second detection/correction power.
Claims19
A hierarchical QAM transmission system comprising:
- a hierarchical QAM transmitter responsive to a first and a second data stream, for transmitting a hierarchical QAM signal comprising a level 1 signal, representing the first data stream, having an uncoded first bit error rate performance, and a level 2 signal, representing the second data stream, having an uncoded second bit error rate performance lower than the first bit error rate performance;
- a hierarchical QAM receiver, coupled to the hierarchical QAM transmitter, for receiving the hierarchical QAM signal and producing received first and second data streams;
- first error detection and correction circuitry processing the first data stream, for encoding the first data stream by a code having a first detection and correction power;
- and
- second error detection and correction circuitry processing the second data stream for encoding the second data stream by a code having a second error detection and correction power;
- wherein the coded bit error rate performance of the first data stream is closer to the coded bit error rate performance of the second data stream than the uncoded bit error rate performance of the first data stream is to the uncoded bit error rate performance of the second data stream.
A hierarchical QAM transmitting system comprising:
- a source of a first and second data stream;
- a hierarchical QAM transmitter responsive to the first and second data stream, for transmitting a hierarchical QAM signal comprising a level 1 signal, representing the first data stream having an uncoded first bit error rate performance, and a level 2 signal, representing the second data stream having an uncoded second bit error rate performance lower than the uncoded first bit error rate performance;
- first error detection and correction circuitry processing the first data stream, for encoding the first data stream by a code having a first detection and correction power;
- and
- second error detection and correction circuitry processing the second data stream, for encoding the second data stream by a code having a second error detection and correction power, wherein:
- the coded bit error rate performance of the first data stream is closer to the coded bit error rate performance of the second data stream than the uncoded first bit error rate performance is to the uncoded second bit error rate performance.
A hierarchical QAM receiving system, comprising:
- a source of a hierarchical QAM signal comprising a level 1 signal, representing a first data stream, having an uncoded first bit error rate performance, and encoded by a first code having a first error detection and correction power, and a level 2 signal, representing a second data stream, having an uncoded second bit error rate performance lower than the first bit error rate performance, and encoded by a second code having a second error detection and correction power;
- and
- a hierarchical QAM receiver coupled to the hierarchical QAM transmitter, for receiving the hierarchical QAM signal and producing received first and second data streams;
- wherein:
- the coded bit error rate performance of the first data stream is closer to the coded bit error rate performance of the second data stream than the uncoded first bit error rate performance is to the uncoded second bit error rate performance.
Dependencies are inferred from the claim text.