Patent Number: 7,787,545

Title: Multi-channel wavelet codec

Abstract: Wavelet filters computed from a wavelet transform are used as a means of pulse shaping binary data transmitted and received over multiple parallel channels. At the transmitter the data is parsed from a serial bit stream to several parallel streams. Within each of the parallel bit streams symbols are formed. Signals are created from each symbol by up-sampling by inserting zeros between successive symbols. These signals are passed through a bank of low-pass and high-pass filters derived from a wavelet packet transform. The filters are paired: one high-pass with a low-pass. The ordering is alternated to preserve "natural" frequency ordering. These steps are repeated for this set of signals until only one signal remains. The remaining signal is transmitted in the base band of the transmission system or they are transmitted by modulating the carrier of the transmission system. At the receiver the steps are reversed to recover symbols.

Inventors: Orr; David (Vancouver, WA), Westerman; Mark M (Longiven, TX)

Assignee: XtendWave, Inc.

International Classification: H04K 1/10 (20060101); H04L 27/28 (20060101)

Expiration Date: 8/31/12018