Multi-Length Cyclic Prefix for OFDM Transmission in PLC Channels
AssigneeTexas Instruments Incorporated
InventorsTarkesh Pande, Anand G. Dabak, Il-Han Kim
Life of this patent
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Abstract
Embodiments of the invention provide multiple cyclic prefix lengths for either both the data-payload and frame control header or only the data payload. Frame control header (FCH) and data symbols have an associated cyclic prefix. A table is transmitted in the FCH symbols, which includes a cyclic prefix field to identify the cyclic prefix length used in the data payload. A receiver may know the cyclic prefix length used in the FCH symbols in one embodiment. In other embodiments, the receiver does not know the FCH cyclic prefix length and, therefore, attempts to decode the FCH symbols using different possible cyclic prefix lengths until the FCH symbols are successfully decoded.
Claims21
1-12. (canceled)
A method, comprising:
- performing, by a receiver in a power line communication (PLC) device:
- receiving packets that include frame control header (FCH) symbols and data symbols;
- decoding the FCH symbols:
- determining a length of a data cyclic prefix for the data symbols from a FCH table;
- and
- decoding the data symbols using the data cyclic prefix length from the FCH table.
The method of claim 1, further comprising:
- decoding the FCH symbols using a predetermined FCH cyclic prefix length.
The method of claim 1, wherein a length of a FCH cyclic prefix is the same as the data cyclic prefix length.
A powerline communications (PLC) device, comprising:
- a receiver configured to receive and decode packets that include frame control header (FCH) symbols and data symbols, the receiver further configured to determine a length of a data cyclic prefix from the decoded FCH symbols, the receiver further configured to decode the data symbols using the data cyclic prefix length.
A power line communication (PLC) device for sending and receiving data over a PLC network, comprising:
- a processor;
- a transmitter coupled to the processor;
- a receiver coupled to the processor;
- and
- a memory coupled to the processor, the memory storing program instructions, the program instructions—when executed by the processor—cause the PLC device to:
- generate frame control header (FCH) symbols and data symbols from encoded FCH and data bits;
- prepend a data cyclic prefix to the data symbols, a length of the data cyclic prefix is selected based upon a characteristic of the PLC network;
- and
- identify the length of the data cyclic prefix in an FCH table carried in the FCH symbols.
A power line communication (PLC) device for sending and receiving data over a PLC network, comprising:
- a processor;
- a transmitter coupled to the processor;
- a receiver coupled to the processor;
- and
- a memory coupled to the processor, the memory storing program instructions, the program instructions—when executed by the processor—cause the PLC device to:
- receive packets that include frame control header (FCH) symbols and data symbols;
- decode the FCH symbols;
- determine a length of a data cyclic prefix from the FCH symbols;
- and
- decode the data symbols using the data cyclic prefix length.
Dependencies are inferred from the claim text.