Technologies for determining the parameters of a transmission line such as a printed circuit board trace and a cable are disclosed. By measuring a reflection coefficient and a transmission coefficient of two different electrical structures with the same type of fixture on each end and transmission lines of different lengths, the attenuation coefficient of the transmission lines can be determined. The attenuation coefficient can indicate whether or not the performance of the transmission line is acceptable or may be used to calibrate a measuring device for subsequent measurements.

Methods and devices for radio frequency (RF) loopback for transceivers are described. A transceiver for communicating RF signals with a target device may transmit signals at a transmit frequency and receive signals at a (different) receive frequency. The transceiver may include a waveguide diplexer for separating and combining signals based on frequency. The transceiver may be configured to couple a loopback signal from a common port of the waveguide diplexer; the loopback signal may be based on a transmit signal. The transceiver may include a loopback translator to translate the loopback signal from the transmit frequency to the receive frequency and provide the translated loopback signal to a receiver used for receiving signals from the target device. The receiver may compare the translated loopback signal with a representation of the transmit signal to generate a compensation signal. A transmitter may use the compensation signal to adjust subsequent transmit signals.

Methods and devices for radio frequency (RF) loopback for transceivers are described. A transceiver for communicating RF signals with a target device may transmit signals at a transmit frequency and receive signals at a (different) receive frequency. The transceiver may include a waveguide diplexer for separating and combining signals based on frequency. The transceiver may be configured to couple a loopback signal from a common port of the waveguide diplexer; the loopback signal may be based on a transmit signal. The transceiver may include a loopback translator to translate the loopback signal from the transmit frequency to the receive frequency and provide the translated loopback signal to a receiver used for receiving signals from the target device. The receiver may compare the translated loopback signal with a representation of the transmit signal to generate a compensation signal. A transmitter may use the compensation signal to adjust subsequent transmit signals.

Method for testing implicit beamforming operation of a radio frequency (RF) data packet signal transceiver device under test (DUT), including transmitting to the DUT combinations of a multidirectional (e.g., legacy) RF test signal and at least two unidirectional (e.g., beamformed) RF test signals with different signal directivity patterns, and monitoring signal strengths of signals received from the DUT in response to each signal. Signal directivity patterns can be controlled by transmitting multiple phase-controlled RF signals via separate arrays of multiple antenna elements to the DUT within a multipath RF signal environment, such as an electromagnetically shielded enclosure.

Method for testing implicit beamforming operation of a radio frequency (RF) data packet signal transceiver device under test (DUT), including transmitting to the DUT combinations of a multidirectional (e.g., legacy) RF test signal and at least two unidirectional (e.g., beamformed) RF test signals with different signal directivity patterns, and monitoring signal strengths of signals received from the DUT in response to each signal. Signal directivity patterns can be controlled by transmitting multiple phase-controlled RF signals via separate arrays of multiple antenna elements to the DUT within a multipath RF signal environment, such as an electromagnetically shielded enclosure.

Various embodiments relate to an electronic device and a method for preventing interference between signals transmitted and received through first and second antennas. To this end, an electronic device according to various embodiments comprises, a first antenna and a second antenna, a battery, a wireless communication module having a coupler, and a processor electrically connected to the first antenna and second antennas, the battery, and the wireless communication module, wherein the processor can be configured to, measure, on the basis of a first signal transmitted and received through the first antenna, the magnitude of components, corresponding to a designated frequency band, of a coupling signal fed back from the coupler, compare the measured magnitude with a designated threshold value, and control at least some elements of the electronic device such that the measured magnitude is reduced to be less than or equal to the designated threshold value when the measured magnitude exceeds the designated threshold value. Other embodiments can also be possible.

Various embodiments relate to an electronic device and a method for preventing interference between signals transmitted and received through first and second antennas. To this end, an electronic device according to various embodiments comprises, a first antenna and a second antenna, a battery, a wireless communication module having a coupler, and a processor electrically connected to the first antenna and second antennas, the battery, and the wireless communication module, wherein the processor can be configured to, measure, on the basis of a first signal transmitted and received through the first antenna, the magnitude of components, corresponding to a designated frequency band, of a coupling signal fed back from the coupler, compare the measured magnitude with a designated threshold value, and control at least some elements of the electronic device such that the measured magnitude is reduced to be less than or equal to the designated threshold value when the measured magnitude exceeds the designated threshold value. Other embodiments can also be possible.

Various embodiments of the present disclosure provide a system and method for characterizing the radio frequency (RF) functionality of a vehicle remote keyless system (RKS) by separating and precisely characterizing the individual bits of the overall RKS system in an enclosed controlled environment. More specifically, this RKS characterization system includes an enclosed testing chamber for isolating the key fob from the vehicle, and a simulation control system that manipulates RF signals between the key fob and the vehicle for controlled RF signal analysis between the components. In certain embodiments, the RKS characterization system includes an automated process for actuating the key fob. Through this process, the RKS characterization system is able to separately identify the Key Fob Factor, the Vehicle Factor, and the Person Factor, of the vehicle RKS system.

Various embodiments of the present disclosure provide a system and method for characterizing the radio frequency (RF) functionality of a vehicle remote keyless system (RKS) by separating and precisely characterizing the individual bits of the overall RKS system in an enclosed controlled environment. More specifically, this RKS characterization system includes an enclosed testing chamber for isolating the key fob from the vehicle, and a simulation control system that manipulates RF signals between the key fob and the vehicle for controlled RF signal analysis between the components. In certain embodiments, the RKS characterization system includes an automated process for actuating the key fob. Through this process, the RKS characterization system is able to separately identify the Key Fob Factor, the Vehicle Factor, and the Person Factor, of the vehicle RKS system.

Wireless communications systems and methods related to reducing the signaling overhead for configuring a common reference signal used in performing coarse power control of multiple spatial domain multiplexing (SDM) uplink streams are provided. A base station may be in communication with a UE via multiple SDM streams directed from the same panel of the respective device. The base station may configure a common pathloss reference signal for the SDM streams of the same panel for the UE. This may include sending a list of possible pathloss reference signal configurations to the UE, and then identifying which configuration to use for the pathloss reference signal for the group of SDM streams. Once known, the UE may measure the reference signal for open loop power control. The BS may occasionally reconfigure the common reference signal for the grouped SDM streams.