Disclosed are a method and device for detecting a standing-wave ratio, which are used for realizing quick and accurate detection of the standing-wave ratio by only using a downlink service signal transmitted by a TD-LTE base station system, thereby preventing a special training sequence from causing additional interference to the base station system. The method comprises: capturing output power detection data (OPD) of a service signal transmitted by the base station system and reflection power detection data (RPD) of a device to be detected in a base station; within a first preset bandwidth range, respectively extracting feedback signals of the OPD and feedback signals of the RPD within a plurality of periods of time according to a preset data length; determining spectrum characteristics of the feedback signals of the OPD and spectrum characteristics of the feedback signals of the RPD respectively corresponding to each period of time, and determining the reflection coefficient of the base station system according to the spectrum characteristics of the feedback signals of the OPD and the spectrum characteristics of the feedback signals of the RPD respectively corresponding to each period of time; and determining the standing-wave ratio of the base station system within the first preset bandwidth range according to the reflection coefficient of the base station system.

The described technology is generally directed towards multidimensional grid sampling for radio frequency power feedback. A mobile device can sample radio frequency signal power at multiple sample points, and can send sample values to a base station. The multiple sample points can be defined with reference to a grid having a first dimension and a second dimension, such as time and frequency, or delay and Doppler. A variety of techniques are provided to define the multiple sample points.

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.

A method for measuring intermodulation produced in a measurement segment of a signal transmission path, by: producing a first. HF signal (u.sub.1(t)) and a second HF signal (u.sub.2(t)), both having a predetermined frequency progression; feeding the first HF signal (u.sub.1(t)) and the second HF signal (u.sub.2(t)) to the signal transmission path, wherein an intermodulation signal is produced, which intermodulation signal has a first intermodulation signal component (u.sub.rPIM(t)) produced in an input segment of the signal transmission path and a second intermodulation signal component (u.sub.PIM(t)) produced in the measurement segment of the signal transmission path; producing a compensation signal (u.sub.c(t)) in accordance with the first intermodulation signal component (u.sub.rPIM(t)) produced in the input segment; introducing the compensation signal (u.sub.c(t)) into the signal transmission path in order to reduce or cancel out the first intermodulation signal component (u.sub.rPIM(t)). The invention further relates to a measuring device for performing said method.

Methods and apparatuses for configuring the zone served by a base station providing wireless communication for a plurality of user equipment located in moving vehicles are disclosed. Motion reports are received from the user equipment, indicating a current location, a current direction of motion, and a current speed of the moving vehicles. The motion reports are received from at least one of: user equipment currently using the base station for wireless communication; user equipment currently within the zone served by the base station, but not using the base station for wireless communication; and/or user equipment currently using at least one neighbouring base station to the base station for wireless communication. A configuration for the zone served by the base station is then determined, based on the motion reports and on locations of the base station and of the at least one neighbouring base station. The configuration for the zone served by the base station is then applied to the base station.

A front-end circuit is used to test an RF signal from an RF device. The RF signal is generated by modulating a carrier signal having a carrier frequency with a wideband baseband signal. A variable frequency oscillator generates a local signal having a variable local frequency. The first frequency mixer frequency mixes a local signal and an RF signal to generate an IF signal having a frequency. A band-pass type first filter filters the IF signal. The local frequency can be selected from a plurality of frequencies having a frequency interval equal to or narrower than a bandwidth of the first filter.

A front-end circuit is used to test an RF signal from an RF device. The RF signal is generated by modulating a carrier signal having a carrier frequency with a wideband baseband signal. A variable frequency oscillator generates a local signal having a variable local frequency. The first frequency mixer frequency mixes a local signal and an RF signal to generate an IF signal having a frequency. A band-pass type first filter filters the IF signal. The local frequency can be selected from a plurality of frequencies having a frequency interval equal to or narrower than a bandwidth of the first filter.

Describes a failures detection system (1) of a plurality of transmitting antennas of television and/or radio signals. The system includes a power divider (15) configured to receive a television and/or radio signal (STV) and from this generate a first plurality (si1, si2, SI3, SI4) of television and/or radio signals, and includes a plurality of directional couplers (10, 11, 12, 13) configured to receive the first plurality of television and/or radio signals and from these generate a corresponding second plurality (So1, So2, So3, So4) of television and/or radio signals. The plurality of directional couplers includes respective first power sensors (40) configured to generate a third plurality (s.sub.pd1, s.sub.pd2, s.sub.pd3, s.sub.pd4) of signals indicative of the direct power transmitted to the plurality of antennas and comprises respective second sensors of power (41) configured to generate a fourth plurality (s.sub.pr1, s.sub.pr2, s.sub.pr3, s.sub.pr4) of signals indicative of the reflected power from the plurality of antennas. The system further includes a signal concentrator (21) configured to receive the third plurality of signals indicative of the direct power and the fourth plurality of signals indicative of the reflected power and generate a multiplexed signal (smx) carrying the third and fourth plurality of signals. The system further includes a processing module (22) configured to receive the multiplexed signal, compare the values of the third plurality of signals indicative of the direct power and of the fourth plurality of signals indicative of the reflected power with respective reference values, generate a signal (sa1) indicative of a failure of at least one of the plurality of antennas in the case in which at least one of the values of the fourth plurality of signals indicative of the reflected power is greater than the respective reference value, and generate the signal (sa1) indicative of a failure of the power divider (15) in the case in which at least one of the values of the third plurality of signals indicative of the direct power is less than the respective reference value.

Various systems and methods for probing a communication channel. These systems and methods transmit an error vector probe packet from a first transmitter while a second transmitter is active and transmitting. A network device may receive the error vector probe packet and measure an error vector magnitude based on the received error vector probe packet. Using the error vector magnitude, the network device estimates channel characteristics such as signal-to-noise ratio, data capacity, etc. The transmission can occur when more than one transmitter is active and transmitting. At least some of the other transmitters are active and transmit an analog zero signal, e.g., all digital zeros on the input to the digital-to-analog converter of a network device when an error vector probe packet is transmitted.

A self-calibrating transmission line resonator oscillating driver apparatus, including: a first output driver module configured to transmit a first forward signal along a transmission line; a second output driver module configured to transmit a second forward signal along the transmission line; a first reflection detection module configured to detect a first return signal of the first forward signal reflected along the transmission line; and a second reflection detection module configured to detect a second return signal of the second forward signal reflected along the transmission line; wherein, when the first reflection detection module detects the first return signal of the first forward signal reflected along the second direction of the transmission line, providing a signal to i) change a power state of the first output driver module to an off-power state and to ii) change a power state of the second output driver module to an on-power state.