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US 8,711,674 B2Granted
Interference suppressing OFDM system for wireless communications
AssigneeAT&T Intellectual Property II, L.P.
InventorDiakoumis Gerakoulis
Life of this patent
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Abstract
An IS-OFDM system for point-to-point wireless communications that suppresses narrow-band interference comprises an IS-OFDM transmitter and an IS-OFDM receiver, wherein a transmitted signal comprises a plurality of subcarriers, and further wherein each subcarrier contains more than one and potentially all symbols transmitted in a given frame. The IS-OFDM transmitted signal is at a data rate that is equal to the data rate of the input data stream via the use of P/S converters.
Claims13
An interference suppression orthogonal frequency division multiplexed system, comprising:
- an interference suppression orthogonal frequency division multiplexed transmitter, wherein the interference suppression orthogonal frequency division multiplexed transmitter comprises:
- a serial-to-parallel converter, the serial-to-parallel converter for accepting an input data stream and for operating on the input data stream to produce a plurality of parallel data streams;
- a plurality of spreaders, each spreader of the plurality of spreaders coupled to the serial-to-parallel converter, each spreader of the plurality of spreaders operates by applying an orthogonal binary code sequence to one of the plurality of parallel data streams spreading the one of the plurality of parallel data streams resulting in a set of parallel spread data streams, wherein each one of the set of parallel spread data streams comprises a plurality of sub-carriers, wherein each one of the plurality of sub-carriers contains all data bits of the input data stream separated from each other by the orthogonal binary code sequence where a power of each one of the data bits is spread to all of the plurality of sub-carriers;
- and
- a plurality of serial-to-parallel buffer and encoder devices, each of the plurality of serial-to-parallel buffer and encoder devices coupled to one of the plurality of spreaders, each of the plurality of serial-to-parallel buffer and encoder devices is for accepting one of the set of parallel spread data streams and for operating on the one of the set of parallel spread data streams to produce a plurality of parallel sub-streams.
2 more elements
An interference suppression orthogonal frequency division multiplexed transmitter, comprising:
- a serial-to-parallel converter, the serial-to-parallel converter for accepting a data stream and for operating on the data stream to produce a plurality of parallel data streams;
- a plurality of spreaders, each spreader of the plurality of spreaders coupled to the serial-to-parallel converter, each spreader of the plurality of spreaders operates by applying an orthogonal binary code sequence to one of the plurality of parallel data streams spreading the one of the plurality of parallel data streams resulting in a set of parallel spread data streams, wherein each one of the set of parallel spread data streams comprises a plurality of sub-carriers, wherein each one of the plurality of sub-carriers contains all data bits of the input data stream separated from each other by the orthogonal binary code sequence where a power of each one of the data bits is spread to all of the plurality of sub-carriers;
- and
- a plurality of serial-to-parallel buffer and encoder devices, each of the plurality of serial-to-parallel buffer and encoder devices coupled to one of the plurality of spreaders, each of the serial-to-parallel buffer and encoder devices is for accepting one of the set of parallel spread data streams and for operating on the one of the set of parallel spread data streams to produce a plurality of parallel sub-streams.
1 more element
An interference suppression orthogonal frequency division multiplexed transmitter, comprising:
- means for serial-to-parallel converting an input data stream to produce a plurality of parallel data streams;
- means for spreading each of the plurality of parallel data streams by applying an orthogonal binary code sequence resulting in a set of parallel spread data streams, wherein each one of the set of parallel spread data streams comprises a plurality of sub-carriers, wherein each one of the plurality of sub-carriers contains all data of the input data stream separated from each other by the orthogonal binary code sequence such that a power of each one of the data bits is spread to all of the plurality of sub-carriers;
- and
- means for serial-to-parallel buffering and encoding each of the set of parallel data streams to produce a plurality of parallel sub-streams.
1 more element
Dependencies are inferred from the claim text.