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 distortion compensation device includes a first table, a second table, a calculating unit, a first updating unit, and a second updating unit. The first table holds a coefficient of a nonlinear term included in a filtering coefficient associated with an address other than a prescribed address obtained from the input signal x(n). The second table holds a coefficient of a linear term related to the prescribed address. The calculating unit calculates, based on the output signal, each of the update amounts of the coefficient of the nonlinear term and the coefficient of the linear term. The first updating unit updates each of the coefficients in the first table based on the update amount of the coefficient of the nonlinear term. The second updating unit updates each of the coefficients of the second table based on the update amount of the coefficient of the linear term.

The present disclosure provides radio-frequency (RF) systems that can detect the presence of RF signals received by the system, as well as determine characteristics such as the operating frequency of RF signals, the type of RF source that transmitted each RF signal, and/or the location of each RF source with high precision and sensitivity while using low cost, scalable electronics that are versatile enough for deployment in a variety of environments. Such systems can employ a network of RF sensors that can coordinate in response to communication with a computer to perform any such detection and/or determination using trained models executed onboard the RF sensors and/or the computer. RF signals may have unique characteristics when received at one or more RF sensors that may be detected using trained models described herein, even in high noise or non-line of sight (LOS) environments and with low cost, low resolution RF receiver hardware.

A method and apparatus for using Euclidean modulation in an antenna are disclosed. In one embodiment, a method for controlling an antenna comprises mapping a desired modulation to achievable modulation states, mapping modulation values associated with the achievable modulation states to one or more control parameters, and controlling radio frequency (RF) radiating antenna elements using the one or more control parameters to perform beam forming.

An example portable electronic device can include: a first antenna, a second antenna, and a third antenna; a first RFFE, a second RFFE, and a third RFFE which are configured to pre-process an RF signal; a first conductive wiring; a first switch including a (1-1)th terminal connected to the first antenna, a (1-2)th terminal connected to one end of the first conductive wiring, and a (1-3)th terminal connected to the first RFFE; a second switch including a (2-1)th terminal connected to the second antenna, a (2-2)th terminal connected to the third antenna, a (2-3)th terminal connected to the second RFFE, a (2-4)th terminal connected to the third RFFE, and a (2-5)th terminal connected to the other end of the first conductive wiring; an RFIC configured to convert RF signals inputted from the first RFFE, the second RFFE, and the third RFFE into a baseband signal, and convert the baseband signal into an RF signal so as to output the RF signal to the first RFFE; and a communication processor configured to control the first switch so as to sequentially connect the (1-3)th terminal to the (1-1)th terminal and the (1-2)th terminal when the portable electronic device operates in a first transmission mode for transmitting a sounding reference signal (SRS) to the wireless communication network by using the first RFFE, and control the second switch so as to sequentially connect the (2-1)th terminal and the (2-2)th terminal to the (2-5)th terminal while the (1-2)th terminal is connected to the (1-3)th terminal.

A video switching system, which can be part of an audio video receivers (AVR), enables simultaneous routing of multiple independent video streams (e.g., 8K video streams) received at HDMI inputs of the AVR from digital media sources to multiple selected digital display devices.

An antenna assembly comprising a base, a modem, a top lid and a housing is disclosed herein. The base is composed of an aluminum material. The modem is disposed on the base. The top lid is for the base, and the top lid comprises at least one antenna element disposed on an exterior surface. The housing covers the top lid and base. The top lid acts as an electro-magnetic barrier for the modem. A communication cable is connected to the modem at one end and extending to and connected to a vehicle internal router with a vehicle modem at the other end.

A signal processing apparatus includes a first signal processing circuit and the second signal processing circuit. The first signal processing circuit receives a first signal. The first signal processing circuit has a power end connecting to a first voltage and a reference ground end. The second signal processing circuit receives a second signal. The second signal processing circuit has a power end which is electrically coupled to the reference ground end of the first signal processing circuit or equals the reference ground end of the first signal processing circuit. The second signal processing circuit has a reference ground end connecting to a second voltage.

A system and method for recovering encoded data from a modulated baseband signal is disclosed. Aspects and embodiments of the system and method include receiving an analog input signal representing a modulated baseband signal, counting clock cycles of a reference clock, detecting a first transition and a second transition of the analog input signal indicating a first change and a second change in the modulated baseband signal, storing a first counter value corresponding to an amount of clock cycles elapsed between the first transition and the second transition, and determining a binary-valued bit sequence corresponding to the first counter value.

A passive component for coupling to, and thereby tracking, an intermediary device within a cable television system is disclosed. The passive component includes a tracking circuit separate in functionality from an existing circuit of the intermediary device. The tracking circuit, which is unpowered and uncontrolled, receives a first signal from a first device in the cable television system, modifies the first signal to create a modified signal, and passes the modified first signal to a second device in the cable television system, the second device being configured to determine a type for the intermediary device based on the modification to the first signal. The first device is one of a cable modem or a CMTS, and the second device is the other of the cable modem and the CMTS.