Patent ID: 7187647
Filing Date: 2007-03-06
Classification: H04J,H04L

Abstract:
1. An interference suppressing orthogonal frequency division modulation (IS-OFDM) system for ultra-wideband (UWB) wireless communications that suppresses narrow-band interference, comprising an in-premises base station (IBS), said IBS comprising an IS-OFDM transceiver for communicating with a plurality of in-premises terminals (ITs) without creating interference outside an in-premises perimeter, 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, said IS-OFDM transceiver comprising an IS-OFDM transmitter and an IS-OFDM receiver, said IS-OFDM transmitter further comprising: a serial-to-parallel (S/P) converter, said S/P converter accepting an input data stream and operating on said input data stream to produce a plurality of parallel data streams; a first plurality of S/P converters, each of said first plurality of S/P converters accepting one of said parallel data streams and producing a plurality of parallel data sub-streams; a plurality of spreaders, each spreader of said plurality of spreaders coupled to one of said first plurality of S/P converters and operating on one of said plurality of parallel data sub-streams, spreading said one of said plurality of parallel data sub-streams by an orthogonal binary code sequence and resulting in a plurality of parallel spread data sub-streams separated from each other by orthogonal codes; a second plurality of S/P converters, each of said second plurality of S/P converters accepting one of said plurality of parallel spread data sub-streams and producing a plurality of parallel data signals; an encoder for encoding said plurality of parallel data signals to produce a plurality of encoded data signals; an inverse discrete Fourier transform (IDFT) coupled to said encoder, said IDFT accepting said plurality of encoded data signals and producing a plurality of IDFT outputs; a parallel-to-serial (P/S) converter coupled to said IDFT, said P/S converter accepting said plurality of IDFT outputs and producing an intermediate IS-OFDM data signal, wherein said intermediate IS-OFDM data signal comprises a plurality of frames and said P/S converter further adds a cyclic prefix to each frame of said intermediate IS-OFDM data signal to produce an IS-OFDM data signal; and a digital-to-analog (D/A) converter, said D/A converter accepting said IS-OFDM data signal and producing an IS-OFDM transmit signal.