Abstract: There is described a method of transmitting an ultra wideband (UWB) signal. The method comprises, inputting an information signal, generating a pseudo random time hopping code; generating a pulse inversion code and using the pseudo random time hopping code, pulse inversion code and information signal to generate the UWB signal. The time hopping code is used to modulate pulses of the signal in a pseudo random manner in order to channelise the signal whilst the pulse inversion code is used to provide additional modulation to pulses of the signal in order to further randomise the signal.

Abstract: A sensor assignment device includes a movement instruction generator for generating and submitting a movement instruction to a distinct one of a plurality of actuators to move a distinct one of a plurality of machine parts, a sensor data receiver for receiving sensor data acquired by a subset of a plurality of sensors, a degree of correlation determiner for determining sensor-specific degrees of correlation between the detected sensor data and the movement instruction, and a sensor assigner for assigning those sensors to the distinct machine part whose sensor-specific degrees of correlation exceed a predetermined threshold or a multiple-step fashion as refinement in case of insufficiently reliable map of affiliations between sensors and machine parts. The received sensor data is used to influence the movement instruction.

Abstract: A sensor assignment device includes a movement instruction generator for generating and submitting a movement instruction to a distinct one of a plurality of actuators to move a distinct one of a plurality of machine parts, a sensor data receiver for receiving sensor data acquired by a subset of a plurality of sensors, a degree of correlation determiner for determining sensor-specific degrees of correlation between the detected sensor data and the movement instruction, and a sensor assigner for assigning those sensors to the distinct machine part whose sensor-specific degrees of correlation exceed a predetermined threshold or a multiple-step fashion as refinement in case of insufficiently reliable map of affiliations between sensors and machine parts. The received sensor data is used to influence the movement instruction.

Abstract: Aspects of the disclosure relate to a frequency suppression circuit arrangement, which allows at least one selected frequency band to be suppressed by coupling the frequency suppression circuit between the input and output of an RF power amplifier. The frequency circuit in the embodiments of the disclosure down-converts a feedback signal derived from the amplified output signal into baseband signals. Each of the baseband signals is fed into an inverting amplifier to generate a negative baseband signal. The negative baseband signal is subsequently filtered to selectively pass the negative baseband signal. The filtered signal is subsequently up-converted into an RF signal. The up-converted RF signal is combined and provided to a coupler connected at the input of the power amplifier such that when the input signal is amplified by the RF power amplifier any signals at the selected frequency can be suppressed.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method of maintaining a communication link between a network node and a mobile node of a communications network comprises providing at least two downlink transmission beams (A to D) and designating a first of the at least two beams as a primary transmission beam (e.g. B). The beams are used in accordance with a schedule. Received signal quality or signal strength measurements are taken at the mobile node and signaled to the network node. A quality of link on the primary transmission beam (e.g. B) and at least one other of the at least two transmission beams (e.g. A, C) is determined from the measurements signaled from the mobile node to the network node and the quality of link for the beams is compared to provide a comparison and the schedule varied in accordance with the comparison.

Abstract: An upconversion stage for a wireless magnetic resonance imaging system local coil array has a number of upconversion circuits. Each upconversion circuit includes a parametric amplifier, an antenna and a delay line between the amplifier and the antenna. The path length of the delay line in one upconversion circuit differs from the path length of the delay line in an adjacent upconversion circuit by a predetermined amount.

Abstract: 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.

Abstract: A method of controlling interference from a transmitter (4) in one communication system to a receiver (1) in another communication system, the method comprising transmitting a beacon (3) beacon from a beacon transmitter associated with the receiver representative of a frequency at which the receiver is trying to receive; listening for the beacon at a beacon receiver associated with the transmitter; and deriving a power spectral density limit for a transmission (2) from the transmitter based upon the strength of the beacon received at the beacon receiver.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.