Patent application number | Description | Published |
20090215386 | Connection Inhibition Apparatus and Method - The apparatus transmits in a first zone, for example, an aircraft, a masking signal which masks transmissions from a second zone outside of the first. By doing this a mobile cellular telephone is inhibited from connecting or attempting to connect to base-stations on the ground. A hole in the masking signal spectrum may be provided to enable connection to a base-station within the aircraft. Alternatively, a base-station within the aircraft may be arranged to transmit at a power level greater than the masking signal. | 08-27-2009 |
20090304047 | Method of controlling interference between communication terminals - A method of controlling interference between communication terminals involves sending a notification of a desire to transmit a transmission over a wireless network from a first terminal; determining whether any terminal in the process of receiving has sent an objection in response to the notification; sending the transmission if no objection is received, and modifying the transmission if an objection is received. | 12-10-2009 |
20100117646 | MAGNETIC RESONANCE SCANNER WITH WIRELESS TRANSMISSION OF SIGNALS - A wireless magnetic resonance imaging scanner has one or more local coils, a microwave antenna array, and a local oscillator, and an upconverter. The local oscillator signal from the local oscillator is transmitted from the microwave antenna array to illuminate the local coils. The local coils generate magnetic resonance signals at a first frequency and the magnetic resonance signals at the first frequency are upconverted in the upconverter to microwave frequencies. The local oscillator operates at a frequency within an unlicensed band, chosen such that desired sidebands for reception of the upconverted local coil magnetic resonance signals fall outside the unlicensed band. | 05-13-2010 |
20100119138 | MOTION COMPENSATION IN MAGNETIC RESONANCE IMAGING - In a method of compensating for the effects of motion of an image subject during magnetic resonance imaging using phase encoding in a magnetic resonance imaging system having a number of wireless local coils and a wireless microwave transceiver array, one or more phase encoding steps are implemented to derive one or more magnetic resonance signals in the wireless coils. The signals from the phase encoding steps are upconverted to generate upper and lower sidebands of the magnetic resonance signals; and the upconverted upper and lower sideband signals are transmitted to the microwave array. Signals are derived from the upper and lower sidebands; and a representative phase difference between the signals derived from the upper and lower sidebands is determined from one or more of the phase encoding steps; then the representative phase difference is applied to each pair of derived signals for every phase encoding step to produce phase compensated signal pairs; such that the pair of signals are moved more closely into phase. | 05-13-2010 |
20100253346 | UPCONVERTER - An upconverter has a two port parametric amplifier that has a first port to receive an input signal to be amplified and upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The upconverter further has an antenna coupled to the second port to receive the local oscillator signal and transmit the amplified, upconverted signal at upper and lower sideband frequencies and a low noise amplifier at the first port of the parametric amplifier, which is powered by the local oscillator signal. | 10-07-2010 |
20100253349 | PARAMETRIC AMPLIFIER DEVICE - A parametric amplifier device has a two port parametric amplifier, a DC voltage generator and a DC bias regulator. The bias regulator has a voltage regulator, an attenuator and a summer. Output voltages from the regulator and the attenuator are added in the summer. | 10-07-2010 |
20100253352 | CALIBRATION METHOD - A method for calibration of a magnetic resonance imaging system having a bore, a body coil mounted in the bore, a patient mat, a number of local coils mounted in the patient mat, an upconversion stage having a number of upconverters, and a processing stage, includes the steps of generating a calibration signal in the body coil; receiving the calibration signal at the local coils, upconverting the signal from the local coils in the upconversion stage, transmitting the upconverted signal to the processing stage, synchronously downconverting the signal in the processing stage using the calibration signal generated in the body coil, and processing the downconverted signal to generate an overall path complex gain. | 10-07-2010 |
20100253353 | UPCONVERTER - A magnetic resonance imaging system upconverter stage has a number of local coils and a number of upconverters to receive a signal from an output of each coil. Each upconverter has a number of two port upconverter cores, each core having a first port to receive a signal from a local coil and a second port to output an upconverted signal at upper and lower sideband frequencies through an antenna coupled to the second port. The inputs of the plurality of upconverter cores are connected in parallel, and at least one antenna is associated with the second port of each core. | 10-07-2010 |
20100253354 | UPCONVERTER - An upconverter has a low noise amplifier, a two port mixer and an antenna. The two port mixer comprises a first port to receive from the low noise amplifier an amplified input signal to be upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The low noise amplifier is coupled to the first port; and the antenna is coupled to the second port. | 10-07-2010 |