Detecting and Encoding Frame Control Headers (FCH)
AssigneeTexas Instruments Incorporated
InventorsAnuj Batra, Tarkesh Pande, Il Han Kim
Life of this patent
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Abstract
Embodiments of the invention provide a method for discriminating between two types of encoding schemes for the frame control header (FCH) used in G3-type narrow band OFDM communications. The two modes for encoding are Differential with respect to the previous Symbol (DS) and Differential with respect to the Preamble (DP). This mode is sometimes referred to as “coherent” mode
Claims11
A method comprising:
- performing, by a receiver in a power line communication (PLC) device,
- receiving packets comprising frame control header (FCH) symbols and data symbols;
- determining where the majority of the demodulated symbols lie on a unitary circle;
- and
- discriminating between types of FCH encoding without having to decode the whole FCH frame;
- and
- decoding the FCH symbols.
A method comprising:
- performing, by a transmitter in a power line communication (PLC) device, using a modified constellation that is to be used with differential with respect to the preamble (DP), wherein a constellation set is modified to include a plurality of complex symbols which lie on a unitary circle thus allowing the symbol phases φk(m) to be more than just 0 and π, where
- φk(m):
- denotes the phase of the symbol at the output of the constellation encoding block corresponding to the kth subcarrier in the mth FCH symbol.
A power line communication (PLC) device, comprising:
- a receiver configured to receive and decode packets comprising frame control header (FCH) symbols and data symbols;
- a FCH detector configured to:
- determining where the majority of the demodulated symbols lie on a unitary circle;
- and
- discriminating between types of FCH encoding without having to decode the whole FCH frame.
A transmitter for a power line communication (PLC) device, comprising:
- a modulator configured to generate frame control header (FCH) symbols by using a modified constellation that is to be used with differential with respect to the preamble (DP), wherein a constellation set is modified to include a plurality of complex symbols which lie on a unitary circle thus allowing the symbol phases φk(m) to be more than just 0 and π, where
- φk(m):
- denotes the phase of the symbol at the output of the constellation encoding block corresponding to the kth subcarrier in the mth FCH symbol.
A computer program product of computer-readable instructions, tangibly embodied on a non-transitory computer-readable medium and executable by a digital data processor to perform actions directed toward transmitting a signal, the computer-readable instructions configured to cause a power line communication PLC device to:
- receive a plurality of packets comprising frame control header (FCH) symbols and data symbols;
- determine where the majority of the demodulated symbols lie on a unitary circle;
- and
- discriminate between types of FCH encoding without having to decode the whole FCH frame;
- and
- decode the FCH symbols.
Dependencies are inferred from the claim text.