METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEC FRAME HEADERS WITH VARIABLE HEADER MODULATION
First Claim
1. A method for encoding FEC frame header information for data packets, comprising:
- encoding header bits in the header information for data packets using Reed-Muller encoding;
processing the Reed-Muller coded header bits by performing a cyclic bit shift operation and an exclusive-OR operation with a pseudo-random binary sequence; and
modulating the Reed-Muller coded header bits with a modulation type that depends upon the modulation type used to modulate data symbols in a corresponding data portion.
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Abstract
A frame header of Forward Error Correction (FEC) is provided, suitable for using in the DVB-C2 Standard. In the DVB-C2 Standard, Adaptive Coding and Modulation (ACM) or Variable Coding and Modulation (VCM) is applied to each FEC block to provide as much flexibility as possible. As a result, a frame header is attached in front of each FEC frame to inform the coding rate, modulation type and physical layer pipe identifier. Besides the signaling of physical layer related information, the FEC frame header has to provide a structure so that it can be easily and reliably detected in the receiver. Motivated by the need in DVB-C2 Standard, an efficient and reliable FEC header suitable for DVB-C2 Standard is provided in at least one implementation in this disclosure that combines use of two different modulation types for the header information. In addition, the detection Method of the FEC header is described.
51 Citations
20 Claims
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1. A method for encoding FEC frame header information for data packets, comprising:
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encoding header bits in the header information for data packets using Reed-Muller encoding; processing the Reed-Muller coded header bits by performing a cyclic bit shift operation and an exclusive-OR operation with a pseudo-random binary sequence; and modulating the Reed-Muller coded header bits with a modulation type that depends upon the modulation type used to modulate data symbols in a corresponding data portion. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for encoding FEC frame header information, comprising:
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an encoder for header bits in the header information for data packets using Reed-Muller encoding; to a processor for processing the Reed-Muller coded header bits by performing a cyclic bit shift operation and an exclusive-OR operation with a pseudo-random binary sequence; and a modulator for modulating the Reed-Muller coded header bits with a modulation type that depends upon the modulation type used to modulate data symbols in a corresponding data portion. - View Dependent Claims (7, 8, 9, 10)
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11. A method for decoding header information, the method comprising:
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receiving a bitstream in a digital cable television transmission; determining from bits encoded in the bitstream a type of modulation used for an FEC frame header; demodulating said FEC frame header in response to the type of modulation determined from said encoded bits. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus for decoding header information, comprising:
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a receiver for receiving a bitstream in a digital cable television transmission; circuitry for determining from bits encoded in the bitstream a type of modulation s used for an FEC frame header; a demodulator for demodulating said FEC frame header in response to the type of modulation determined from said encoded bits. - View Dependent Claims (17, 18, 19, 20)
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Specification