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Abstract

A multi-carrier data transmission system utilizing lapped transforms. Information to be transmitted is divided into a plurality of channels that are coded using a transform that places information into narrow bandwidth channels. The system makes use of the superior properties of filter banks constructed with narrow-band lapped transforms to provide improved signal isolation between the data channels. A new form of lapped transformation that provides both narrow-band filtering and phase information is described. The transform utilizes two components to provide information on phase changes induced by errors on the communication link. The improved transform provides a means for correcting for phase shifts that occur on the communication link. The system has superior burst noise immunity compared to systems based on FFT's.

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First Claim