A fiber optic distribution terminal includes a cable spool rotatably disposed within an enclosure; an optical power splitter and a termination region carried by the cable spool; an optical cable deployable from the enclosure by rotating the cable spool by pulling on a connectorized end of the optical cable; and splitter pigtails extending between the optical power splitter and the termination region. One fiber of the optical cable extending between the connectorized end and the splitter input. The other fibers of the optical cable extend to a multi-fiber adapter.

A system for routing signals in a Distributed Antenna System (DAS) includes one or more local Digital Access Units (DAUs) located at a local location and one or more remote DAUs located at one or more remote locations. Each of the one or more local DAUs includes an optical port coupled to an upstream unit. The upstream unit includes at least one of a repeater, a baseband unit, a Base Transceiver Station (BTS), or a DAU. The one or more remote DAUs are coupled to the one or more local DAUs via one or more optical cables. A distance between the local location and each of the one or more remote locations is greater than two kilometers.

A distributed antenna system comprises: a plurality of ports configured to receive downstream signals or transmit upstream signals; a plurality of first antennas configured to transmit the downstream signals or receive the upstream signals; a power regulating unit coupled between the plurality of ports and the plurality of first antennas and configured to transfer and regulate the downstream signals or the upstream signals, wherein the power regulating unit comprises: a plurality of first links respectively corresponding to different frequency bands, and a first power regulating section configured to regulate power of link signals transferred over each first link, such that link signals of different frequency bands transferred over the plurality of first links have substantially the same power. The solution of the present disclosure can support input of signals at multiple frequency bands, achieve power balance and improve system performance and wireless coverage effects.

An Automated Analysis and Warning of Optical Transmission (AWOT) between BBU unit and RRU of radio transmitting station accurately and quickly identifies errors on an optical transmission line, thereby reducing costs in terms of labor and equipment, and at the same time reducing service downtime of mobile communication systems.

A wireless radio frequency conversion system is disclosed. The baseband device generates or receives a baseband signal. The remote radio device transforms between the baseband signal and a radio frequency signal. The beamforming device adjusts amplitude and phase of the radio frequency signal or adjusts scale factor and phase factor of the baseband signal. The conversion device performs an optical-electrical conversion to the radio frequency signal. One of the beamforming device, the conversion device, and the wireless radio frequency conversion system having a one-to-many conversion device performs a one-to-many conversion to the radio frequency signal or the baseband signal to generate radio frequency signals or baseband signals, or performs a many-to-one conversion to the radio frequency signals or the baseband signals to generate the radio frequency signal or the baseband signal. The front-end module amplifies the radio frequency signal. The antenna transmits or receives the radio frequency signal.

A transmission device includes a symbol generator that generates a modulation symbol by mapping transmission data to a signal point arranged in a two-dimensional or three-dimensional color space; and an outputter that outputs an optical signal modulated according to the modulation symbol.

Provided is a distributed antenna system (DAS) for multi-frequency band and multi-carrier equipped with an open radio access network (O-RAN) remote unit (RU) according to an O-RAN technology standard for building a next-generation radio infrastructure. To this end, the DAS for multi-carrier and multi-frequency band based on an O-RAN standard includes an O-RAN RU connected to a fronthaul network according to an O-RAN split option specification of base station transceiver systems (BTSs), and including a plurality of O-RAN RUs to accommodate a plurality of carriers and a plurality of frequency bands; and a channel combiner to which outputs of the plurality of O-RAN RUs are combined.

A communication device designed for an interior compartment, for example of a motor vehicle. The device includes a radiofrequency communication module and an interface module which is operationally coupled to the radiofrequency communication module in order to receive a digital signal generated by the radiofrequency communication module, and to modulate an electric power supply signal for at least one lamp, according to the digital signal, in order to generate a modulation of light emitted by the lamp according to the digital signal received from the radiofrequency communication module.

A system for generating and receiving a polarization multiplexed single sideband signal is provided, which includes a light wave generating unit connected with a signal modulating unit and configured to generate a light wave; a driving signal generating unit connected with the signal modulating unit and configured to generate a driving signal; the signal modulating unit configured to split the light wave into two orthogonal polarized light waves, and modulate the driving signal on the polarized light waves to obtain a polarization multiplexed upper sideband optical signal and a polarization multiplexed lower sideband optical signal which are coupled to output a mixed signal, the mixed signal is transmitted to a separating and converting unit to obtain electrical millimeter wave signals; the electrical millimeter wave signals are transmitted through an MIMO wireless link to a signal sampling and processing unit to be converted into digital signals for digital signal processing.

A digital mobile fronthaul (MFH) network includes a baseband processing unit (BBU) having a digitization interface configured to digitize, using delta-sigma digitization, at least one wireless service for at least one radio access technology. The network further includes a transport medium in operable communication with the BBU. The transport medium is configured to transmit a delta-sigma digitized wireless service from the BBU. The network further includes a remote radio head (RRH) configured to operably receive the delta-sigma digitized wireless service from the BBU over the transport medium.