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US 9,832,062 B2Granted
Interference suppressing OFDM system for wireless communications
AssigneeAT&T Intellectual Property II, L.P.
InventorDiakoumis Parissis Gerakoulis
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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.
Claims17
An interference suppression orthogonal frequency division multiplexed system, comprising:
- an interference suppression orthogonal frequency division multiplexed receiver, wherein the interference suppression orthogonal frequency division multiplexed receiver comprises:
- a serial-to-parallel converter for processing a received signal to produce a plurality of parallel data streams;
- a transform module for applying a transform function to the plurality of parallel data streams to produce a plurality of parallel complex data streams;
- a decoder mapper module for applying a demapping function to the plurality of parallel complex data streams to produce a plurality of parallel demapped data streams;
- a first parallel-to-serial converter for processing the plurality of parallel demapped data streams to produce a serial data stream;
- a plurality of despreaders, each despreader of the plurality of despreaders coupled to the parallel-to-serial converter, each despreader of the plurality of despreaders operates by applying a code sequence to the serial data stream resulting in a set of parallel despread data streams;
- a plurality of accumulators for summing the set of parallel despread data streams to produce a plurality of accumulated data streams;
- and
- a second parallel-to-serial converter for processing the plurality of accumulated data streams to produce a recovered data stream, wherein each one of the set of parallel despread data streams comprises a plurality of sub-carriers, wherein each one of the plurality of sub-carriers contains data bits of the recovered data stream separated from each other by the code sequence where a power of each one of the data bits is spread to all of the plurality of sub-carriers.
6 more elements
An interference suppression orthogonal frequency division multiplexed receiver, comprising:
- a serial-to-parallel converter for processing a received signal to produce a plurality of parallel data streams;
- a transform module for applying a transform function to the plurality of parallel data streams to produce a plurality of parallel complex data streams;
- a decoder mapper module for applying a demapping function to the plurality of parallel complex data streams to produce a plurality of parallel demapped data streams;
- a first parallel-to-serial converter for processing the plurality of parallel demapped data streams to produce a serial data stream;
- a plurality of despreaders, each despreader of the plurality of despreaders coupled to the parallel-to-serial converter, each despreader of the plurality of despreaders operates by applying a code sequence to the serial data stream resulting in a set of parallel despread data streams;
- a plurality of accumulators for summing the set of parallel despread data streams to produce a plurality of accumulated data streams;
- and
- a second parallel-to-serial converter for processing the plurality of accumulated data streams to produce a recovered data stream, wherein each one of the set of parallel despread data streams comprises a plurality of sub-carriers, wherein each one of the plurality of sub-carriers contains data bits of the recovered data stream separated from each other by the code sequence where a power of each one of the data bits is spread to all of the plurality of sub-carriers.
5 more elements
A method for producing a recovered data stream, the method comprising:
- processing, by a receiver, a received signal to produce a plurality of parallel data streams;
- applying, by the receiver, a transform function to the plurality of parallel data streams to produce a plurality of parallel complex data streams;
- applying, by the receiver, a demapping function to the plurality of parallel complex data streams to produce a plurality of parallel demapped data streams;
- processing, by the receiver, the plurality of parallel demapped data streams to produce a serial data stream;
- applying, by the receiver, a code sequence to the serial data stream resulting in a set of parallel despread data streams;
- summing, by the receiver, the set of parallel despread data streams to produce a plurality of accumulated data streams;
- and
- processing, by the receiver, the plurality of accumulated data streams to produce the recovered data stream, wherein each one of the set of parallel despread data streams comprises a plurality of sub-carriers, wherein each one of the plurality of sub-carriers contains data bits of the recovered data stream separated from each other by the code sequence where a power of each one of the data bits is spread to all of the plurality of sub-carriers.
5 more elements
Dependencies are inferred from the claim text.