Situne Corporation

Hitachi, Ltd.

Arctic Semiconductor Corporation

Marzieh Veyseh

Vahid Mesgarpour Toosi

Mahdi Khoshgard

Saeid Mehrmanesh

Ryosuke Fujiwara

Mehdi Khoshgard

Hamid Nejati

Vahid M Toosi

A direct digital radio having a high-speed RF front end in communication with an antenna, and a radio subsystem that can be configured to form a programmable multi-standard transceiver system. The high-speed RF front including RF inputs configured to receive a plurality of radio frequencies (e.g., frequencies between 400 MHz to 7.2 GHz, millimeter wave frequency signals, etc.) and wideband low noise amplifiers provides amplified signals to RF data converters, analog interfaces, digital interfaces, component interfaces, etc. The programmable multi-standard transceiver is operable in frequencies compatible with multiple networks such as private LTE and 5G networks as well as other wireless IoT standards and WiFi in multi-standard network access equipment. The programmable multi-standard transceiver can greatly reduce complexity for the baseband processing, lower the cost of the overall transceiver system, reduce power consumption, and at the same time, benefit from improvements on the digital functions through integration.

Integrated high speed wireless transceiver

Integrated radio frequency transceiver

Approaches provide for processing a communications signal, such as a wideband communications signal. For example, a communications signal can be received at an access device, such as a cable modem or a wireless transceiver/radio. The access device can include components operable to process the communications signal to enable access to, for example, video, data, voice, high-speed Internet services. At least some of the components include an echo cancellation component among other components to cancel interference (e.g., ACI, ALI). For example, the echo cancellation component can use trained filters and samples of the upstream signal, echoed samples of the transmitted signal, feedback signals of the echoed signal, etc., to estimate one or more types of interference. Thereafter, the estimated interference can be used to cancel interference at the access device.

Self interference cancellation for high performance transceivers

Approaches provide for determining spectral information for a communications signal, such as a wideband communications signal. For example, a communications signal (e.g., a wideband signal) is received at a set of analog-to-digital converters (ADCs). The output of the ADCs is divided into a set of segments. A center frequency for each segment is determined based on the segment bandwidth and a number of segments in the set. The segments can be filtered, buffered, and analyzed using at least one digital signal processing technique (e.g., Fast Fourier Transform (FFT) technique to generate a representation of the segments in the frequency domain. Thereafter, the spectrum of frequency components (i.e., the frequency-domain representation) of the segments can be used to determine the power spectral density of the communications signal for different resolutions based on a resolution mode of the system or other criteria of the system.

Spectrum monitoring

Approaches provide for calibrating high speed analog-to-digital converters (ADCs). For example, a calibration signal can be applied to parallel ADCs. The output of the parallel ADCs can be analyzed using a set of filtering components configured to at least filter image components and cause a phase shift in the output signals. One or more delay adjustment components can cause a delay to at least the output of the parallel ADCs and the set of filtering components. A cross-correlating component can be utilized to cross-correlate the output of the parallel ADCs with an output signal of at least one filtering component of the set of filtering components and an output signal of at least one delay adjustment component of the set of delay adjustment components. A conversion component determines polar coordinates from rectangular coordinates from the output of the cross-correlating component. Thereafter, a time-offset and gain estimator component can determine one of gain error calibration data or time-offset calibration data based at least in part on an output signal of the conversion component, which can be stored and/or used to calibrate individual time-interleaved ADCs.

Time error and gain offset estimation in interleaved analog-to-digital converters

Approaches provide for calibrating high speed analog-to-digital converters (ADCs). For example, a calibration signal can be applied to parallel ADCs. The output of the parallel ADCs can be analyzed using a gradient-based optimization approach or other such optimization approach to determine optimized gain error calibration data to compensate for gain mismatch in and between individual parallel time-interleaved ADCs and to determine time-offset calibration data to compensate for timing errors in and between individual parallel time-interleaved ADCs. For example, once a calibration signal is applied to an ADC, the output of the ADC can be analyzed to determine a spectrum of the calibration signal. One or more images (e.g., phasors) of the spectrum can be determined and used to determine initial values of the optimization. Thereafter, the optimization approach can be utilized to determine optimized gain error calibration data and optimized time-offset calibration data, which can be stored and/or used to calibrate individual time-interleaved ADCs.

Offset calibration of analog-to-digital converters using a spectrum analyzer

Embodiments relate generally to method, system and apparatus for wireless communications between multiple wireless sensor nodes for wireless sensor networks. More specifically, disclosed are system and method that enable wireless communications between devices using different wireless transmission protocols, via one or more multi-channel intermediate devices.

Communications between connected devices

The present disclosure relates to methods and systems for monitoring upstream signals and for providing the total bandwidth to a base station for analysis of any disruptions. In an example, the present methods and systems include at least a first circuit and a second circuit. The first circuit is coupled to a cable input-output port. The first circuit is configured for providing upstream signals from broadband signals of the upstream feed. The second circuit is configured for processing the upstream signals by adjusting its dynamic range to provide processed signals with an adjusted dynamic range. The second circuit is also configured for analyzing a spectrum of the processed signals and for providing information characterizing the processed signals to a processor of a modem.

Total spectrum reception for upstream monitoring

The present disclosure relates to a method and system for tone signal removal from a noisy signal that includes a desired signal in combination with the tone signal. The method and system provides an artificial or estimated undesired tone signal with the same frequency as the undesired tone signal, which, in combination with an estimated phasor, is available to filter or subtract a noisy component from the noisy signal and to provide the filtered or clean desired signal.

Tone removal for digital circuits

The present disclosure relates to a method and system for calibrating transceivers by providing a stored index that was calculated of a race condition count. The race condition is based at least in part to a rat race between a clock signal and an input signal that has been sampled by a random or jitter signal. The stored index corresponds to a relative timing error between the clock signal and the sampled input signal. The stored index is used to scramble subsequent input signals that are thermo-coded signals, thereby eliminating timing errors.

Dynamic calibration for transceivers

Channel selection for concurrent communications between wireless devices

The present disclosure relates to methods and systems for LNAs with high linearity and low noise for wideband receivers that receive high dynamic range signals. A multi-stage multipath LNA is disclosed in which outputs from various stages are amplified with variable gains and combined in parallel. A smart gain control unit evaluates the noise and non-linearity characteristics associated with each gain stage to configure the variable gains for the various stages to generate an overall LNA gain that minimizes the overall noise and/or non-linearity characteristics of the LNA while ensuring that the overall gain for the LNA satisfies the desired gain. The variable gains may be configured to change smoothly over the dynamic range of the input signal. Noise is minimized by reducing additional gain stages and by the smooth change in gain when switching between stages. High linearity performance is maintained by minimizing the number of gain stages combined.

Growing community of inventors

Los Altos, CA, United States of America

Marzieh Veyseh