Patent ID: 7158474

Claim:
An Interference Suppression Orthogonal Frequency Division Multiplexed (IS-OFDM) system for point-to-point wireless communications that suppresses narrow-band interference, comprising: an IS-OFDM transmitter comprising: a serial-to-parallel (S/P) converter, said S/P converter accepts an input data stream and operates on said input data stream to produce a plurality of parallel data streams; a plurality of spreaders, each spreader of said plurality of spreaders coupled to said S/P converter, each spreader of said plurality of spreaders operates on one of said plurality of parallel data streams spreading said one of said plurality of parallel data streams by an orthogonal binary code sequence resulting in a set of parallel spread data streams separated from each other by orthogonal codes; and a plurality of S/P buffer and encoder devices, each said S/P buffer and encoder device of said plurality of SIP buffer and encoder devices coupled to one of said plurality of spreaders, each S/P buffer and encoder device further accepts one of said set of plurality spread data streams and operates on said one of said set of parallel spread data streams to produce a plurality of parallel sub-streams; a plurality of Inverse Discrete Fourier Transforms (IDFTs), each IDFT of said plurality of IDFTs coupled to one of said plurality of SIP buffer and encoder devices, each said IDFT accepts said plurality of parallel sub-streams, produced by said SIP buffer and encoder device to which it is coupled, and operates on said plurality of parallel sub-streams to produce a plurality of IDFT outputs; a plurality of parallel-to-serial (P/S) converters, each P/S converter of said plurality of P/S converters coupled to one of said plurality of IDFTs, each said P/S converter accepts said plurality of IDFT outputs produced by said IDFT to which it is coupled to produce a plurality of IS-OFDM data signals, each of said plurality of IS-OFDM data signals comprises a plurality of frames, each said P/S converters further adding a cyclic prefix to each frame of said plurality of frames of each said plurality of IS-OFDM data signals that each of said P/S converter produces; an accumulator coupled to said plurality of P/S converters, said accumulator accepting said plurality of IS-OFDM data signals and producing an IS-OFDM signal; a digital-to-analog (D/A) converter coupled to said accumulator, said D/A converter accepts said IS-OFDM signal and produces an IS-OFDM transmit signal; and an IS-OFDM receiver, wherein a transmitted signal comprises a plurality of subcarriers, and further wherein each subcarrier of said plurality of subcarriers contains more than one and potentially all symbols transmitted in a given frame.