Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reexamination Certificate
2005-11-08
2005-11-08
Chin, Stephen (Department: 2634)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
C714S006130
Reexamination Certificate
active
06963622
ABSTRACT:
An approach is provided for bit labeling of a signal constellation. A transmitter generates encoded signals using, according to one embodiment, a structured parity check matrix of a Low Density Parity Check (LDPC) code. The transmitter includes an encoder for transforming an input message into a codeword represented by a plurality of set of bits. The transmitter includes logic for mapping non-sequentially (e.g., interleaving) one set of bits into a higher order constellation (Quadrature Phase Shift Keying (QPSK), 8-PSK, 16-APSK (Amplitude Phase Shift Keying), 32-APSK, etc.), wherein a symbol of the higher order constellation corresponding to the one set of bits is output based on the mapping.
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Eroz Mustafa
Lee Lin-Nan
Sun Feng-Wen
Chin Stephen
Grunebach Georgann S.
The DIRECTV Group Inc.
Vartanian Harry
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