Abstract: A method implemented by computers includes exchanging a key between a first user and a second user. Ephemeral session keys are generated. The ephemeral session keys are generated by a first computer associated with the first user and a second computer associated with the second user. An encrypted key generation response is exchanged between the first computer and the second computer. A new session request is received. It is determined that there is a valid session state. It is confirmed that there is a valid user. It is determined that there is a valid session identification. Information between the first computer and the second computer is cryptographically exchanged in response to the valid session state, the valid user and the valid session identification.

Abstract: A high power class D amplifier/modulator for use in Radio Frequency ranges that is capable of digital modulation schemes at high efficiencies is disclosed. The new amplifier design features an envelope tracker unit that uses digital pulse-width modulation (PWM) generation to create analog I and Q phase high voltage signal components and sign bits. The I and Q phase signal components and sign bits are fed into an Fs/4 modulator stage to produce an analog output that is an high power RF signal modulated by the analog input signal.

Abstract: A high power class D amplifier/modulator for use in Radio Frequency ranges that is capable of digital modulation schemes at high efficiencies is disclosed. The new amplifier design features an envelope tracker unit that uses digital pulse-width modulation (PWM) generation to create analog I and Q phase high voltage signal components and sign bits. The I and Q phase signal components and sign bits are fed into an Fs/4 modulator stage to produce an analog output that is an high power RF signal modulated by the analog input signal.

Abstract: An analog radio frequency input and an analog feedback from an output of a radio frequency amplifier are digitized and down-converted. Pre-distortion coefficients are calculated based on the down-converted input and down-converted feedback and the down-converted input is filtered using the pre-distortion coefficients. The filter output is then up-converted to a carrier frequency and converted to analog to be provided to the radio frequency amplifier.

Abstract: A method of dispensing registration that includes entering identifying information in an input module on a registration dispensing system. The identifying information is associated obtaining a registration. At least item is displayed on a display module associated with the registration dispensing system for which the registration may be obtained using the registration dispensing system. Registration payment information for the registration is received into the input module. The identifying information and the registration payment information are communicated with a database maintained by or on behalf of an entity issuing the registration. Registration information is received from the database. The registration information is formatted. The formatted registration information is printed on a registration document. The registration document is dispensed.

Abstract: An analog radio frequency input and an analog feedback from an output of a radio frequency amplifier are digitized and down-converted. Pre-distortion coefficients are calculated based on the down-converted input and down-converted feedback and the down-converted input is filtered using the pre-distortion coefficients. The filter output is then up-converted to a carrier frequency and converted to analog to be provided to the radio frequency amplifier.

Abstract: The present invention is a method and apparatus for implementing in embedded software the functionality of one or more external user interface circuits either in a surface mountable integrated circuit or in the main system CPU of a telecommunication unit.

Abstract: A method and apparatus for data transmission using existing highly compressed telecommunications media, and in particular encoding, transmitting, receiving, and decoding digital data using vocal sounds.

Abstract: A method and device for using a single antenna for simultaneously receiving radio frequency signals in different L-band and GPS data band radio frequency bands embodied by example in a circuit having a directional coupler configured to direct a signal input at a first port into two second ports. Filters are coupled to receive the output of each second port, the filters being configured to reflect radio frequency energy in radio frequency bands other than the GPS data radio frequency band. The directional coupler is further configured to direct the reflected radio frequency energy into another port of the directional coupler. A filter is coupled to the other port of the directional coupler and is configured to reflect radio frequency energy in radio frequency bands other than the L-band radio frequency.

Abstract: A method and circuit for accurately measuring radio frequency power level in a pulsed RF transmission.

Abstract: A method and device for using a single antenna for simultaneously receiving radio frequency signals in a first radio frequency band and radio signals in a second radio frequency band different from the first radio frequency band.

Abstract: A method and device for using a single antenna for simultaneously receiving radio frequency signals in a first radio frequency band and radio signals in a second radio frequency band different from the first radio frequency band.

Abstract: A closed loop automatic gain compensation method and circuit for a radio transmission and reception system formed of a radio frequency transmitter coupled through a high power amplifier to a radio frequency antenna to transmit a radio frequency transmission signal, the automatic gain compensation circuit utilizing the preexisting radio system cabling.