Xtendwave, Inc.

Other

Xw LLC

David E Orr

Mark M Westerman

Lou A Beal

A method for inverting telecommunication channel distortion by adaptive wavelet lifting. The distortion signal is analyzed using wavelet lifting and the inverse filter is computed. Coefficients of the inverse filter are used to either compute a transmission pre-filter or to update the transmitted message.

Inversion of channel distortion by adaptive wavelet lifting

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.

Multi-channel wavelet codec

Wavelet filters computed from a wavelet transform are used for encoding, transmitting, receiving, and decoding spread spectrum signals on multiple parallel frequency channels. The transmitter encodes the data stream via a mapping to a basis set of wavelets which are orthogonal across the time domain. The spread spectrum data is parsed from a serial bit stream to several parallel streams. The number of bits per symbol need not remain constant. Signals are created from each symbol by first 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 resulting signal is transmitted in the base band of the transmission system, or transmitted by modulating the carrier of the transmission system. At the receiver, the steps are reversed to recover the symbols. Symbol decisions are made through any one of a number of methods.

Code division multiple access employing orthogonal filter banks

A method for encoding, transmitting, and receiving signals utilizes adaptive wavelet packet trees. A transmitter accepts a binary data stream assumed to be random. At the transmitter the data is parsed from a serial bit stream into several parallel streams. Within each of the parallel bit streams symbols are formed from the bits. Signals are created from each symbol by up-sampling. These signals modulate low-pass and high-pass filters that are derived from a wavelet packet transform (the wavelet and scaling functions, or, equivalently the low-pass and high-pass analysis filters). The filters are paired&#x2014;one high-pass with one low-pass. The steps recited above are recursively repeated logN times for a signal of length N. The resulting signal is transmitted to the receiver. At the receiver, the steps recited above are reversed at the receiver to recover symbols, with the up-sampled signal down-sampled to remove inserted zeroes.

Optimal filter-bank wavelet modulation

An apparatus and method is disclosed for establishing a one-time cryptographic pad between a communicating pair, a communicating pair comprising a pair of transmitter-receivers, each of the pair having a plurality of cryptographic devices in common. The communicating pair also store previously exchanged messages and transmissions, a transmission comprising secure data exchanged by the pair that is independent of message content. The first transmitter-receiver randomly selects a cryptographic device and a previous transmission or message that has been sent to the second transmitter-receiver. The first transmitter-receiver also randomly selects a reference to a message or transmission previously sent by the second transmitter-receiver. The first transmitter-receiver encrypts the previously sent transmission or message and the reference to the message or transmission previously sent by the second transmitter-receiver and sends to the second transmitter-receiver. The second transmitter-receiver discovers the encryption device used by the first transmitter-receiver, verifies the message or transmission sent by the first transmitter-receiver, and uses the decrypted reference to access the previously sent transmission or message, then uses the discovered encryption device to encrypt the previously sent transmission or message and sends to the first transmitter-receiver. The first transmitter-receiver decrypts the transmission or message previously sent by the second transmitter-receiver, and authenticates. If authentication is successful, the first transmitter-receiver encrypts using the randomly selected cryptographic device.

Transmission of encrypted messages between a transmitter and a receiver utilizing a one-time cryptographic pad

A blank panel for use with rack units. The blank panel comprises at least one face plate having a rectangular front plate surface, a back plate surface, top plate surface, bottom plate surface and two side plate surfaces. The face plate has a height corresponding to multiples of 1.75 inches. The face plate incorporates at least one recess for slidably receiving fasteners. The blank panel further comprises fasteners with mating portions for being slidably engaged with the face plate, and fastening portions for being further attachable to a rack unit. The fasteners have varied geometry to accommodate rack units with alternate configurations. The blank panel further comprises a plurality of face plates attached along the top and bottom plate surfaces. Each of the face plates is capable of individually receiving fasteners. The individual face plates of the blank panel are also modular and can be separated to configure the blank panel to varied height requirements.

Blank panel for rack units

A steam generation device comprising two cylinders, an inner and an outer cylinder, the inner cylinder forming a combustion chamber into which streams of air, water and fuel are released under computer control. Water is introduced under pressure into the plenum formed by the inner and outer cylinder and exits into the combustion chamber top holes drilled at an angle into the inner cylinder. Using a model of the combustion process and the flame's gas envelope pressure, the computer maintains combustion and steam production without extinguishing the flame, in response to demands for differing quantities of steam volume, temperature and pressure.

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Vancouver, WA, United States of America

David E Orr