Abstract: The present invention relates generally to a system and method of transmitting coded messages electronically using a wireless mobile communication device to transmit coded messages corresponding to programmable icons and providing for users to create and/or edit their own icons or coded messages.

Abstract: The present invention relates generally to a system and method of transmitting coded messages electronically using a wireless mobile communication device to transmit coded messages corresponding to programmable icons and providing for users to create and/or edit their own icons or coded messages.

Abstract: A system and method for testing an antenna, such as for antenna gain, is disclosed. The system generates an antenna test signal at a selected frequency. A pulse phase modulator modulates the signal with a random pseudo-noise sequence to produce a broad band spread spectrum antenna test signal. A transmission antenna is connected to the pulse phase modulator for transmitting the broad band spread spectrum antenna test signal to a test antenna. A pseudo-noise generator generates the respective pseudo-noise sequence at a predetermined delayed time corresponding to the time delay of a spread spectrum signal from the transmission antenna through the test receiver. A mixer mixes the broad band spread spectrum antenna test signal with the generated pseudo-noise sequence for despreading the broad band spread spectrum antenna test signal. Any signals generated by any reflections or interference that is not synchronized with the original spread spectrum signals is decorrelated.

Abstract: A system and method tests the frequency response of a linear time-invariant unit-under-test, such as an antenna. A test signal is generated at a selected frequency and modulated with a spread spectrum input excitation signal to produce a broadband test signal that is substantially wider than the bandwidth of a device-under-test. The test signal is transmitted from one of either the unit-under-test or test device to a responsive test device or unit-under-test. The test signal is demodulated by mixing an input excitation signal that is delayed and increased in steps, such that the difference in time generates an estimate of the impulse response of the unit-under-test. The test signal is correlated and integrated to filter out unwanted interference and reflections.

Abstract: A system and method of testing for passive intermodulation in antennas includes circuitry for generating at least two distinct frequencies. A pulse phase modulator modulates each frequency with a random pseudo-noise sequence to produce respective broad band spread spectrum signals. At least two test antennas receive the respective broad band spread spectrum signals and transmit the signals through free space, where they are reflected into another antenna and receiver, which includes a demodulator for despreading broad band spread spectrum signals. Respective pseudo-noise sequences are generated as in the pulse phase modulator at a predetermined delayed time and mixed with the broad band spread spectrum signal to despread the broad band spread spectrum signals and obtain the desired signal information relating to passive intermodulation produced from the test antenna.