The present disclosure relates to a system for generating a predefined electrical signal in an MR scanner for use in electrical stimulation of a subject during MRI or functional MRI of said subject, wherein said MR scanner is located inside a shielded MRI room. The system comprises a control unit to be located outside the MRI room for generating an electrical signal and an electrical to optical converter to be located outside the MRI room for converting said electrical signal to a corresponding optical signal. An optical transmitting element, such as an optical fiber, is used for transmitting the optical signal into the MRI room, and an optical to electrical converter is used for converting the optical signal to said predefined electrical signal for electrical stimulation of the subject during magnetic resonance imaging. The optical to electrical converter is configured for being located inside the MRI room and for operation during magnetic resonance imaging.

Systems and methods for signal path isolation for neutral-host hardware are provided. In one embodiment, an isolation circuit for a multiple-subchannel wireless communication transceiver comprises: a Tx path coupled to a transmit path output of a multiple-subchannel transceiver; a Rx path coupled to a receive path input of the transceiver; a precancellation circuit comprising: an isolation adjustment circuit within the transmit path of the isolation circuit, the isolation adjustment circuit comprising a phase shifter and a reflection tuner; a directional coupler within the Rx path of the isolation circuit. The isolation adjustment circuit outputs a reflected wave signal comprising a cancellation reference signal to the directional coupler. The cancellation reference signal comprises a complex conjugate of a TX signal leakage signal component of a signal transported in the Rx path of the isolation circuit. Within the directional coupler the cancellation reference signal destructively interferes with TX signal leakage signal component.

Systems and methods for signal path isolation for neutral-host hardware are provided. In one embodiment, an isolation circuit for a multiple-subchannel wireless communication transceiver comprises: a Tx path coupled to a transmit path output of a multiple-subchannel transceiver; a Rx path coupled to a receive path input of the transceiver; a precancellation circuit comprising: an isolation adjustment circuit within the transmit path of the isolation circuit, the isolation adjustment circuit comprising a phase shifter and a reflection tuner; a directional coupler within the Rx path of the isolation circuit. The isolation adjustment circuit outputs a reflected wave signal comprising a cancellation reference signal to the directional coupler. The cancellation reference signal comprises a complex conjugate of a TX signal leakage signal component of a signal transported in the Rx path of the isolation circuit. Within the directional coupler the cancellation reference signal destructively interferes with TX signal leakage signal component.

Auto balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary winding. The auto-balancing transformer includes a movable to selectively couple primary phases with two or fewer phases of the secondary system.

An electronic apparatus and a method for determining which of a plurality of coexistence modes to execute with a processor. The processor selectively runs one or more applications. Each coexistence mode when executed enables coexistence of wireless communication according to first and second wireless communication protocols. The processor executes a program so as to: measure wireless signal conditions of signals received with the first and second wireless communication protocols, respectively; determine packet statistics of communication packets received with the first and second wireless communication protocols, respectively; obtain, for each application being run by the processor, an application performance indication, an application first communication protocol setting; and an application second communication protocol setting; determine which one of the coexistence modes to execute based on the wireless signal conditions, the packet statistics, the application performance indication, application first communication protocol setting; and the application second communication protocol setting.

An electronic apparatus and a method for determining which of a plurality of coexistence modes to execute with a processor. The processor selectively runs one or more applications. Each coexistence mode when executed enables coexistence of wireless communication according to first and second wireless communication protocols. The processor executes a program so as to: measure wireless signal conditions of signals received with the first and second wireless communication protocols, respectively; determine packet statistics of communication packets received with the first and second wireless communication protocols, respectively; obtain, for each application being run by the processor, an application performance indication, an application first communication protocol setting; and an application second communication protocol setting; determine which one of the coexistence modes to execute based on the wireless signal conditions, the packet statistics, the application performance indication, application first communication protocol setting; and the application second communication protocol setting.

A microwave bridge circuit routes a transmission signal from a transmitter to a resonator and forwards the reception signal generated in the resonator to a receiver. It includes two electrical lines connected in parallel at a first circuit point TX, where the transmission signal is divided. The first electrical line has an attenuator for attenuating a first transmission signal portion. The second electrical line carries a second transmission signal portion and connects to the resonator at a second circuit point R, which divides it between section L1, which runs from TX to R, and section L2, which runs from R to a third circuit point RX. The length of the sections L1 and L2 corresponds to an odd integer multiple of one quarter of the wavelength of the transmission signal, and the divided transmission signal portions are combined at RX, where the reception signal is forwarded to the receiver.

A wireless communication chip includes an analog front-end circuit and a baseband circuit. The analog front-end circuit includes a first transceiver circuit and a second transceiver circuit, wherein the first transceiver circuit is arranged to transmit or receive signals through a first antenna, and the second transceiver circuit is arranged to transmit or receive signals through a second antenna. The baseband circuit is arranged to control the first transceiver circuit to use a first band or a second band for communication, and/or to control the second transceiver circuit to use the first band or the second band for communication. The baseband circuit controls the first transceiver circuit and the second transceiver circuit so that the analog front-end circuit alternately performs 2T2R in the first band and 2T2R in the second band.

A wireless communication chip includes an analog front-end circuit and a baseband circuit. The analog front-end circuit includes a first transceiver circuit and a second transceiver circuit, wherein the first transceiver circuit is arranged to transmit or receive signals through a first antenna, and the second transceiver circuit is arranged to transmit or receive signals through a second antenna. The baseband circuit is arranged to control the first transceiver circuit to use a first band or a second band for communication, and/or to control the second transceiver circuit to use the first band or the second band for communication. The baseband circuit controls the first transceiver circuit and the second transceiver circuit so that the analog front-end circuit alternately performs 2T2R in the first band and 2T2R in the second band.

An antenna interface arrangement is disclosed for cancellation of a transmit signal at a receiver port of a transceiver. The antenna interface arrangement comprises an amplifier and a distributed transformer having a primary side winding, a first secondary side winding, and a second secondary side winding. The primary side winding is connectable to a transmitter port of the transceiver and has a first part (311) and a second part (312), the first secondary side winding (313) is connectable to an antenna port of the transceiver and has a first inductive coupling to the first part of the primary side winding, and the second secondary side winding (314, 315) is connectable to the receiver port of the transceiver and has a second inductive coupling to the second part of the primary side winding. The amplifier (305, 306) has an input connected to the first secondary side winding and an output connected to the second secondary side winding. The second inductive coupling is adapted to provide a first version of the transmit signal at the receiver port, and the first inductive coupling and the amplifier are adapted to provide a second version of the transmit signal at the receiver port, for cancelling the first version of the transmit signal. Corresponding transceiver and communication device are also disclosed.