Ge Medical Systems Global Technology Company, LLC

Ge Precision Healthcare LLC

Beijing University of Posts and Telecommunications

Hai Huang

Yu Liu

Haoyang Xing

Wei Yang

Sheng Tong

Anmou Liao

Chenxing Zhao

Qibin Peng

Xiaojun Jing

Xuelian Lu

Haotian Jiang

Provided in the present invention are a power control apparatus for a radio-frequency power amplifier and a radio-frequency transmission system for a magnetic resonance imaging system. The power control apparatus comprises: a power control module used to receive a control voltage so as to control an output power of the radio-frequency power amplifier; a voltage detection module used to detect an operating voltage provided to the radio-frequency power amplifier and to output a detected voltage; and a voltage adjustment module used to adjust, on the basis of the detected voltage, the control voltage received by the power control module so as to adjust the output power of the radio-frequency power amplifier.

Power control apparatus for radio-frequency power amplifier and radio-frequency transmission system for MRI system

The embodiment of the present application provides a method and apparatus for spectrum prediction in a cognitive radio network. The method comprises: receiving a target access request from a secondary user; obtaining real-time occupancy information of bands through a subspace filtering-based spectrum sensing approach; updating a spectrum resource database of radio environment maps (REM) according to the real-time occupancy information of hands; establishing a prediction model for bands occupied by primary users according to the updated spectrum resource database of radio environment maps (REM); and allowing an access of the secondary user to a target band according to the prediction model for bands occupied by primary users. The method and apparatus provided by embodiments of the present application allow a secondary user to have a targeted spectrum access. The spectrum utilization efficiency of the radio network can thus be improved.

Frequency spectrum prediction method and apparatus for cognitive wireless network

Embodiments of the present invention relate to the technical field of RF circuits, and in particular, to a balun. In an embodiment of the present invention, a balun is provided which comprises at least two coaxial cables, each of which is wound into at least one loop, and the inner and outer conductors of one end of all coaxial cables are connected respectively to each other and the inner and outer conductors of the other end are also connected to each other. The novel balun according to the embodiments of the present invention has a small size but a large power capacity and low cost, and can be used in a magnetic field environment.

Balun

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Beijing, China

Hai Huang