Systems, methods, and apparatus are provided for automated identification of open space in a wireless communications spectrum, by identifying sources of signal emission in the spectrum by automatically detecting signals, analyzing signals, comparing signal data to historical and reference data, creating corresponding signal profiles, and determining information about the open space based upon the measured and analyzed data in near real-time.

A transceiver configured to: determine a reference frequency offset relative to a second transceiver based on double sided ranging; correct first and second portions of a packet received from a respective first and second antenna; and determine an angle of arrival of the packet based on corrected first and second portions and the reference frequency offset.

[FIG. 10]

A method of reducing transmission power for an encoded data stream includes the steps of receiving an incoming data stream having equal probability for a plurality of incoming data bits, assigning a symbol scheme to the received data bits of the incoming data stream according to probabilities of occurrence of individual ones of the received data bits, and transmitting an outgoing data stream according to the assigned symbol scheme having a second average transmit power, different than the first average transmit power, for a plurality of outgoing symbols.

The present invention relates to a transmitting device. The transmitting device comprises a processor , and a transmitter ; wherein the processor is configured to generate a fractional Orthogonal Frequency Division Multiplexing (OFDM) symbol based on an adjacent OFDM symbol, wherein the fractional OFDM symbol is a cyclic extension of the adjacent OFDM symbol; wherein the transmitter is configured to transmit a multicarrier signal comprising the fractional OFDM symbol and the adjacent OFDM symbol. Furthermore, the present invention also relates to a corresponding method, a multicarrier wireless communication system comprising such a transmitting device, a computer program, and a computer program product.

A distributed radio frequency communication system facilitates communication between a wireless terminal and a core network. The system includes a remote radio unit (RRU) coupled to at least one antenna to communicate with the wireless terminal. The RRU includes electronic circuitry to perform at least a first portion of a first-level protocol of a radio access network (RAN) for communicating between the wireless terminal and the core network. The system also includes a baseband unit (BBU) coupled to the core network, and configured to perform at least a second-level protocol of the RAN. A fronthaul link is coupled to the BBU and the RRU. The fronthaul link utilizes an adaptive fronthaul protocol for communication between the BBU and the RRU. The adaptive fronthaul protocol has provisions for adapting to conditions of the fronthaul link and radio network by changing the way data is communicated over the fronthaul link.

A plurality of drivers for driving corresponding differential data output signals are arranged in series such that a first current discharged by a first one of the drivers is recycled through remaining ones of the drivers.

A transmission code processing device includes: a signal point arrangement shaping encoding unit to perform conversion into a shaped bit of mi column; a systematic error correction encoding unit to generate a parity bit of mp column based on the shaped bit; a first symbol mapping unit to convert the shaped bit into a first modulation symbol; a second symbol mapping unit to convert the parity bit into a second modulation symbol; and a symbol multiplexing unit to multiplex the first and second modulation symbols, in which the first modulation symbol has one element in a first signal point set including ci signal point including an origin, the second modulation symbol has one element in cp signal point not including the origin, and the signal point arrangement shaping encoding unit performs signal point arrangement shaping in which the first modulation symbol has one element in the first signal point set.

A receiving circuit includes: a first receiving terminal for receiving a RF signal; a second receiving terminal for receiving an external oscillating signal generated by an external oscillator; a low-noise amplifier coupled with the first receiving terminal and the second receiving terminal and utilized for generating an output signal; a first switch element positioned between the second receiving terminal and the low-noise amplifier; an in-phase signal processing circuit for generating an in-phase detection signal based on the output signal; an quadrature signal processing circuit for generating an quadrature detection signal based on the output signal; and a calibration circuit for controlling the first switch element and capable of performing an I/Q mismatch calibration operation according to the in-phase detection signal and the quadrature detection signal when the first switch element is turned on.

Systems and methods for die-to-die communication are provided. A first transceiver disposed on a first die includes a transmission section configured to modulate first data onto a carrier signal having a first frequency. The first transceiver includes a reception section configured to receive signals from a transmission line. The reception section includes a filter configured to pass frequencies within a first passband that includes a second frequency. The first frequency is outside of the first passband. A second transceiver is disposed on a second die and is configured to communicate with the first transceiver via the transmission line. The second transceiver includes a transmission section configured to modulate second data onto a carrier signal having the second frequency. The second transceiver includes a reception section including a filter configured to pass frequencies within a second passband that includes the first frequency. The second frequency is outside of the second passband.

One embodiment of the present invention relates to a method for transmitting a signal to an unlicensed band of a base station in a wireless communication system. The method comprises the steps of: transmitting at least one of a preamble and a reservation signal, if it is determined through carrier sensing that the unlicensed band is available; and transmitting a PDSCH on the unlicensed band immediately after the transmission of at least one of the preamble and the reservation signal. the preamble enables a terminal to acquire reception synchronization for at least one of the reservation signal and the PDSCH.