A communication system disposed in a housing includes multiple communication devices each of which performing a wireless communication with one another. The communication devices include a specific communication device disposed on a mounting surface. The specific communication device includes at least one antenna structure, and the at least one antenna structure includes at least one antenna. The at least one antenna structure is disposed between the mounting surface and a predetermined wall surface of the housing. A gap between an outer shell of the at least one antenna structure and the predetermined wall surface of the housing is smaller than a wavelength of a radio wave used in the wireless communication of the communication devices. The at least one antenna of the specific communication device has a directivity in a direction parallel to the mounting surface.

A communication system disposed in a housing includes multiple communication devices each of which performing a wireless communication with one another. The communication devices include a specific communication device disposed on a mounting surface. The specific communication device includes at least one antenna structure, and the at least one antenna structure includes at least one antenna. The at least one antenna structure is disposed between the mounting surface and a predetermined wall surface of the housing. A gap between an outer shell of the at least one antenna structure and the predetermined wall surface of the housing is smaller than a wavelength of a radio wave used in the wireless communication of the communication devices. The at least one antenna of the specific communication device has a directivity in a direction parallel to the mounting surface.

Data center management over a power plane, including: coupling, via a plurality of power planes, a management hub to one or more servers; and transferring, via the plurality of power planes, data between the management hub and the one or more servers.

Systems and method of remote server management replace the traditional server network port associated network cabling with power line networking by using a server's power cables are used to carry both power and Ethernet traffic between the remote server and a network management switch. In this manner, the amount of network cabling in a server rack is reduced, and the need for a management port on a server is eliminated, freeing up ports on a top of rack switch that, otherwise, would have been used for management purposes only.

A method and a system for extracting a characteristic signal from a power frequency signal, and a file management method therefor are provided. The method includes steps of: S1, detecting a voltage half-wave zero-crossing area in a single voltage cycle in the power frequency signal by a signal triggering device; superimposing a voltage modulation signal on the voltage half-wave zero-crossing area, and superimposing an instantaneous pulse on a current cycle in the power frequency signal corresponding to the voltage half-wave zero-crossing area to form a current modulation signal; generating the characteristic signal with multiple continuous current cycles and multiple voltage cycles; S2, demodulating in real time whether there is the voltage modulation signal in the power frequency signal by a signal identification device, if so, executing step S3; if not, performing no operation; and S3, demodulating the characteristic signal by the signal identification device to obtain the current modulation signal and the voltage modulation signal respectively; and determining whether data corresponding to the current modulation signal and date corresponding to the voltage modulation signal are predetermined data, wherein if so, the characteristic signal exists; if not, no characteristic signal exists. The method has strong anti-interference ability and high signal demodulation accuracy, which is suitable for industrial distribution networks with large interference.

A method and a system for extracting a characteristic signal from a power frequency signal, and a file management method therefor are provided. The method includes steps of: S1, detecting a voltage half-wave zero-crossing area in a single voltage cycle in the power frequency signal by a signal triggering device; superimposing a voltage modulation signal on the voltage half-wave zero-crossing area, and superimposing an instantaneous pulse on a current cycle in the power frequency signal corresponding to the voltage half-wave zero-crossing area to form a current modulation signal; generating the characteristic signal with multiple continuous current cycles and multiple voltage cycles; S2, demodulating in real time whether there is the voltage modulation signal in the power frequency signal by a signal identification device, if so, executing step S3; if not, performing no operation; and S3, demodulating the characteristic signal by the signal identification device to obtain the current modulation signal and the voltage modulation signal respectively; and determining whether data corresponding to the current modulation signal and date corresponding to the voltage modulation signal are predetermined data, wherein if so, the characteristic signal exists; if not, no characteristic signal exists. The method has strong anti-interference ability and high signal demodulation accuracy, which is suitable for industrial distribution networks with large interference.

In a communication apparatus, an analog circuit includes a circuit element to be connected to a first conductor, and processes a differential signal. A communication circuit receives, via a connection circuit, a differential signal processed by the analog circuit, and generates a signal for which the potential of a second conductor is used as a reference potential based on the received differential signal. An inductor is connected between the first conductor and the second conductor. The connection circuit includes a circuit element different from a capacitor. The analog circuit (21), the connection circuit, the communication circuit, the inductor, the first conductor, and the second conductor are housed in a conductive housing box.

In a communication apparatus, an analog circuit includes a circuit element to be connected to a first conductor, and processes a differential signal. A communication circuit receives, via a connection circuit, a differential signal processed by the analog circuit, and generates a signal for which the potential of a second conductor is used as a reference potential based on the received differential signal. An inductor is connected between the first conductor and the second conductor. The connection circuit includes a circuit element different from a capacitor. The analog circuit (21), the connection circuit, the communication circuit, the inductor, the first conductor, and the second conductor are housed in a conductive housing box.

Apparatus and methods for providing enhanced coverage in a quasi-licensed wireless system using a reduced-cost base station apparatus. In one embodiment, the base station is configured to utilize quasi-licensed 3.55-3.70 GHz CBRS (Citizens Broadband Radio Service) GAA and PAL spectrum, and employs a power amplifier sharing arrangement in its transmitter chain(s), along with multi-sector antenna elements. A scheduling algorithm operative on the base station generates sector-specific weights which are used to allocate the shared power amplifier(s) between the different sectors. Advantageously, design and production costs of the base station are reduced through sharing of comparatively expensive amplifier and transmitter chain components, thereby allowing for commoditization of the base station for mass distribution.

Apparatus and methods for providing enhanced coverage in a quasi-licensed wireless system using a reduced-cost base station apparatus. In one embodiment, the base station is configured to utilize quasi-licensed 3.55-3.70 GHz CBRS (Citizens Broadband Radio Service) GAA and PAL spectrum, and employs a power amplifier sharing arrangement in its transmitter chain(s), along with multi-sector antenna elements. A scheduling algorithm operative on the base station generates sector-specific weights which are used to allocate the shared power amplifier(s) between the different sectors. Advantageously, design and production costs of the base station are reduced through sharing of comparatively expensive amplifier and transmitter chain components, thereby allowing for commoditization of the base station for mass distribution.