Noise test systems, methods, and circuitries are provided for determining a phase error of a first modulator using a second modulator. In one example, an integrated circuit device includes a first modulator configured to modulate a first signal to generate a first modulated signal and a second modulator configured to modulate a second signal to generate a second modulated signal. The first signal and the second signal are based on the same reference signal. The integrated circuit device also includes analysis circuitry configured to determine a first modulator phase error based on the first modulated signal and the second modulated signal

Technology for an eNodeB operable to configure measurement subframes for a user equipment (UE) is disclosed. The eNodeB can identify a first set of orthogonal frequency division multiplexing (OFDM) symbols of a measurement subframe to transmit a plurality of primary synchronization signals (PSS) to the UE in the measurement subframe. The eNodeB can identify a second set of OFDM symbols of the measurement subframe to transmit a plurality of secondary synchronization signals (SSS) to the UE in the measurement subframe. The eNodeB can encode the plurality of primary synchronization signals (PSS) for transmission to the UE using the first set of OFDM symbols of the measurement subframe. The eNodeB can encode the plurality of secondary synchronization signals (SSS) for transmission to the UE using the second set of OFDM symbols of the measurement subframe.

Techniques for employing precise transmission capabilities of a physical (PHY) layer to transmit time-synchronization beacons at an edge-of-field-resolution increment of a field of MAC layer frame. In some examples, the PHY layer may transmit beacons with a greater precision than permitted by lower-resolution MAC layer header fields. The communication protocol may specify the size of the field that is populated with timing information at a first precision. However, the PHY layer may be capable of transmitting with a second precision that is greater than the first precision. Thus, to virtually increase the time-synchronization resolution of the beacons, the beacons may be transmitted by the PHY layer at an edge-of-field resolution of the MAC layer header field. In this way, the first precision of the timing information in the MAC layer header field is virtually increased to the second precision of the PHY layer.

Provided is a method for calculating a timestamp associated with a data packet before transcoding of the data packet. The method may include sampling a time of day (TOD) signal to provide a sampled TOD. A previously sampled TOD estimate may be retrieved. An internal TOD estimate may be determined based on the sampled TOD and the previously sampled TOD estimate. A timestamp may be determined based on the internal TOD estimate. A system and computer program product are also disclosed.

Methods and systems are described for sequentially obtaining a plurality of data streams, the plurality of data streams comprising a data stream in a current condition, a data stream in a skewed-forward condition, and a data stream in a skewed-backward condition, calculating, for each data stream in the plurality of data streams, a corresponding set of cost-function values by obtaining a corresponding set of eye measurements, the eye measurements obtained by adjusting a sampling threshold of a sampler generating a plurality of samples of the data stream, the plurality of samples comprising edge samples and data samples, wherein the data stream is sampled at a rate equal to twice a rate of the data stream and calculating the corresponding set of cost-function values based on the corresponding set of eye measurements, and generating a skew control signal based on a comparison of the sets of calculated cost-function values.

A leader system for time synchronizing includes an interface and a processor. The interface is configured to receive a time standard. The processor is configured to determine whether a time jump is necessary in response to the time standard; and in response to determining that the time jump is necessary: 1) cause pausing of a collection of sensor data; 2) provide an indication to unregister one or more follower devices from a leader device; and 3) time jump a leader device time in response to the time standard.

A method and an apparatus for estimating synchronization of a broadcast signal in a time domain using a synchronization estimation signal through steps of: performing a correlation operation using a correlation window on a plurality of synchronization estimation signals separated to a plurality of paths and outputting a plurality of correlated signals; delaying the plurality of correlated signals to output a plurality of delayed signals; and estimating the synchronization using the plurality of delayed signals are provided.

Generating, during a first and second signaling interval, an aggregated data signal by forming a linear combination of wire signals received in parallel from wires of a multi-wire bus, wherein at least some of the wire signals undergo a signal level transition during the first and second signaling interval; measuring a signal skew characteristic of the aggregated data signal; and, generating wire-specific skew offset metrics, each wire-specific skew offset metric based on the signal skew characteristic.

A master control device connected to a plurality of slave control devices via a network is configured to include an own local time counted by a counter unit, in a message and transmit the message to the slave control devices by the timing synchronization unit, calculate a difference between a reception time of a message transmitted from the slave control device, which has received the message, at a timing corrected in accordance with the local time and a pre-calculated message reception predicted time by a timing synchronization determination unit, calculate a correction amount for timing of the slave control devices using the difference by a timing synchronization correction unit, add the correction amount to the local time, include the local time in a message, and transmit the message to the slave control devices.

Digital serializer/deserializer circuitry includes a data path and a date eye monitoring path. The data path includes a first analog-to-digital converter (ADC) to sample incoming data at a first rate, first digital filter circuitry to filter output of the first ADC, and a data slicer coupled to output of the first digital filter circuitry to output data above a threshold. The monitoring path includes a second ADC to sample the incoming data at a second rate lower than the first rate and to take samples at varying points along the incoming data waveform, second digital filter circuitry to filter output of the second ADC, and another data slicer coupled to output of the second digital filter circuitry to output data above an adjustable threshold and to sweep through varying threshold values. Error rate circuitry compares outputs of the data slicers to determine a data eye error rate.