Abstract:
A receiver having a test signal generator configured to generate a test signal that free of a requirement to be frequency locked, and to measure a frequency of the test signal; and a local oscillator signal source configured to tune a local oscillator signal to a difference frequency with respect to the measured test signal frequency, wherein the difference frequency falls within a passband of a passband filter of the receiver.
Abstract:
Methods and apparatus for calibrating a polar transmitter are provided. Calibration circuitry is configured to generate an adjustment signal that communicates an amplitude modulation/phase modulation (AMPM) delay value to AMPM delay circuitry that is configured to delay, based at least on the AMPM delay value, output of a signal by digital signal processing circuitry (DSP) in the polar transmitter. The calibration circuitry includes signal generation circuitry, estimation circuitry, and delay circuitry. The signal generation circuitry is configured to generate a calibration signal to control the polar transmitter to generate a calibration transmit signal. The estimation circuitry is configured to receive a result signal that is based on the calibration transmit signal and estimate the AMPM delay value based at least on the result signal. The delay circuitry is configured to provide an adjustment signal to communicate the estimated AMPM delay value to the AMPM delay circuitry.
Abstract:
Method for testing a radio frequency (RF) data packet signal transceiver device under test (DUT) including communicating via each one of multiple available signal channels. Data packets exchanged between a tester and DUT as a normal part of a communication link initiation sequence are exchanged in such a manner that the tester transmits via all available channels simultaneously, thereby ensuring that a properly working DUT will always transmit in response. For example, in the case of a Bluetooth low energy transceiver, advertisement, scan request and scan response data packets can be used in such manner.
Abstract:
A communications apparatus (200) is configured to provide wireless network access in accordance with a communications standard that specifies a transmit OFF power threshold requirement. The apparatus comprises a hardware subsystem (300) comprising a test signal control component (306), a duplexer component (208), and Radio Frequency processing components (302). The Radio Frequency processing components (302) comprise a transmitter chain portion (204) having an output operably coupled to a transmit side port of the duplexer component (208). The Radio Frequency processing components (302) also comprise a receiver chain portion (206) having a signal sensitivity threshold associated therewith and is operably coupled to a receive side port of the duplexer component (208). The test signal control component (306) is arranged to cooperate with the transmitter chain (204) to generate a test signal, a portion of the test signal control component (306) being leaked by the duplexer component (208) from the transmit side port to the receive side port thereof. The test signal control component (306) is also configured to ensure that any irradiated power of the test signal complies with the transmit OFF power threshold requirement and the portion of the test signal leaked is above the signal sensitivity threshold of the receiver chain portion.
Abstract:
Systems and methods are disclosed herein to provide communication test systems for the mobility testing of multi-user multiple-input multiple-output (MU-MIMO) radio frequency wireless data communication devices, systems and networks. In accordance with one or more embodiments, a test system containing an MU-MIMO traffic generator and analyzer is disclosed that includes a mobility effects scheduler operative in conjunction with a channel impairment simulator to perform tests related to mobile MU-MIMO devices such as wireless clients and terminals. Such a test system may offer improved capabilities, such as flexible measurements of mobility performance, more accurate assessments of MU-MIMO wireless channel utilization and data throughput, measurements on MU-MIMO devices under mobility stress, and automated measurements of MU-MIMO mobility testing.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Messen von in einem Messabschnitt eines Signalübertragungspfads erzeugter Intermodulation, mit folgenden Schritten: Erzeugen eines ersten HF-Signals (u 1 (t)) mit einem vorbestimmten Frequenzverlauf und eines zweiten HF-Signals (U 2 (t)) mit einem vorbestimmten Frequenzverlauf; Zuführen des ersten HF-Signals (u 1 (t)) und des zweiten HF-Signals ü 2 (t) zu dem Signalübertragungspfad (302), wobei in dem Signalübertragungspfad aus dem ersten HF-Signal (u- 1 (t)) und dem zweiten HF-Signal (u 2 (t)) ein Intermodulationssignal erzeugt wird, das einen in einem Eingangsabschnitt des Signalübertragungspfads erzeugten ersten Intermodulationssignalanteil (u rPIM (t)) und einen in dem Messabschnitt (301) des Signalübertragungspfads erzeugten zweiten Intermodulationssignalanteil (u rPIM (t)) aufweist; Erzeugen eines Kompensationssignals (uc(t)) in Abhängigkeit von dem in dem Eingangsabschnitt erzeugten ersten Intermodulationssignalanteil (urpiM(t)); Einleiten des Kompensationssignals (u c (t)) in den Signalübertragungspfad zum Verringern oder Auslöschen des ersten Intermodulationssignalanteils (u rPIM (t)). Femer betrifft die vorliegende Erfindung ein Messgerät zum Ausführen dieses Verfahrens.
Abstract:
A method of using tester data packet signals and control instructions for testing multiple data packet signal transceiver devices under test (DUTs). During mutually alternating time intervals, selected ones of which are substantially contemporaneous, multiple tester data packet signals and DUT control instructions are used for concurrent testing of multiple DUTs.
Abstract:
A self-monitoring, passive distributed antenna system (DAS) (100) includes at least one master controller (102) and a plurality of passive distributed antennas (20) connected via a radio frequency (RF) network (16) to the master controller (102), 5 each distributed antenna (20) being operable to emit an RF signal received via the RF network (16). The DAS (100) includes a plurality of slave receivers (120) coupled with the distributed antennas (20), the slave receivers (120) being connected to the RF network (16). The master controller (102) is operable to produce a test signal for transmission to, and emission by, the distributed antennas (20), and each slave 10 receiver (120) is operable to receive the test signal emitted by its coupled distributed antenna (20) and transmit a result signal indicative of characteristics of the received test signal back to the master controller (102), thereby to monitor transmission status of its coupled distributed antenna (20).
Abstract:
Method and system for testing a radio frequency (RF) data packet signal transceiver device under test (DUT) by monitoring RF data packet signals between a tester and a DUT at a low network media layer, such as the physical (PHY) layer in accordance with the Open Systems Interconnection (OSI) reference model stack. By testing at a low layer, fewer signal conversions and data packet operations are required to perform various basic DUT tests, such as data packet throughput, DUT signal transmission performance, DUT packet type detection without packet decoding, validation of rate adaptation algorithms, and bit error rate (BER) testing.