US 5,497,398 AGranted

Multi-carrier transceiver

AssigneeAware, Inc.

InventorsMichael A. Tzannes, Marcos C. Tzannes

Life of this patent

Estimating the term…

Loading patent…

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.

Claims6

Dependent claims

A system for communicating information over a communication link, said system comprising:

means for receiving data symbols specifying said information;
means for converting groups of M said data symbols to a plurality of time-domain samples, said convening means comprising means for storing the last W said data symbols received by said receiving means, where W is an integer multiple of M and M and W are greater than 1, and first correlation means for computing the correlation of said stored symbols with M vectors .sup.i A, for i=1, . . . , M, each said vector having W components;
means for sequentially transmitting said time-domain symbols on said communication link, each said time-domain symbol being transmitted as an analog signal on said communication link;
means for receiving said analog signals from said communication link and for convening said analog signals to digital values;
means for storing the digital values corresponding to the last W said analog signals received;
and
second correlation means for computing the correlation of said stored digital values with M complex vectors .sup.i B+j.sup.i B', to obtain M modified data symbols S'.sub.i, for i=1, . . . , M, wherein .sup.i B and .sup.i B' are real valued, and j=.sqroot.-1.

4 more elements

Dependencies are inferred from the claim text.