Cypress Semiconductor Corporation

Ittiam Systems (p) Ltd.

Amit Shaw

Satyam Srivastava

Ayush Sood

Sri Ramya Thota

Prashant Kota

Kamesh Medapalli

Saishankar Nandagopalan

Rajendra Kumar Gundu Rao

Sreenivas Karanam

Bhargava Yalala

Nutan Reddy Annapu Reddy

Kempraju Gopinath

Methods and systems for improving digital pre-distortion calibration of a radio frequency power amplifier. The disclosed method includes, among other things, initiating digital pre-distortion calibration of a power amplifier of a radio frequency (RF) module, determining, based on a transmission power of a training signal transmitted to the power amplifier between a first transmission power value and a second transmission power value, a set of estimated coefficients, generating, based on a subset of the set of estimated coefficients, a set of predicted coefficients, wherein the set of predicted coefficients are derived from a fitting curve applied to the subset of the set of estimated coefficients, and storing the set of estimated coefficients and the set of predicted coefficients.

Digital pre-distortion calibration of a radio frequency power amplifier

A wireless device includes a radio having a front end and a first local oscillator (LO) and control logic coupled to the radio. The control logic determines, from a received trigger frame, a carrier frequency offset (CFO) between a first carrier frequency of the first LO and a second carrier frequency of a second LO of an access point operating in a multi-user transmission mode. The control logic triggers, based on the CFO, an LO trim of the first LO to adjust the first carrier frequency to match, within a threshold tolerance, the second carrier frequency. The radio can then transmit, to the access point, a protocol data unit frame using the trimmed first LO, the protocol data unit frame being associated with the multi-user transmission mode.

Wireless per-frame-based local oscillator trimming for uplink multi-user transmission

Systems, methods, and devices provide multi-user communication between wireless devices. Methods include identifying, using processing elements of a software enabled access point, a plurality of wireless devices communicatively coupled to the software enabled access point, aggregating, using the processing elements, data associated with the plurality of wireless devices, and generating, using the processing elements, transmission instructions identifying transmission periods for the plurality of wireless devices. Methods also include generating, using the processing elements, a data frame based on the aggregated data, the data frame comprising a data payload that comprises the aggregated data and the transmission instructions.

Multi-user communication for wireless devices

Systems, methods, and devices schedule network traffic for wireless communications devices. Methods include identifying a plurality of stations included in a first network, and generating, using one or more processors of a first access point, a network traffic schedule configured to assign a plurality of service periods to the plurality of stations, the network traffic schedule identifying a plurality of sleep times and wake times for the plurality of stations. Methods further include transmitting a query frame to at least one station of the plurality of stations during a designated service period, and receiving a data transmission from the at least one station, the data transmission being generated by the station based on transmission parameters included in the query frame.

Scheduling of network traffic for wireless communications devices

A method and a system for communication are presented. In one example embodiment, the method includes the step of receiving a first frame of a communication signal. The first frame includes a first plurality of constituents. One or more constituents of the first plurality of constituents of the first frame form a symbol of the first frame. The method includes the step obtaining a second frame. The second frame includes the first plurality of constituents. One or more constituents of the first plurality of constituents of the second frame form a symbol of the second frame. The symbols of the second frame are obtained by creating redundancies of the constituents of the first plurality of one or more symbols of the first frame. The first frame includes a second plurality of constituents. One or more constituents of the second plurality of the first frame form a preamble field of the first frame. The step of obtaining includes the step of creating redundancies of one or more constituents of the second plurality of constituents at the beginning and/or at boundary(ies) of one or more symbols of the second frame.

Method and system for communication

The method and system of digital timing correction in a digital baseband communication system is disclosed. In one embodiment, a method includes receiving samples at a predetermined time interval based on a current clock signal of a receiver clock, reading in a prompt sample of the received samples and a successor sample of the received samples based on a control signal, interpolating a projected sample based on the prompt sample, the successor sample and a predetermined time offset, determining the time offset for interpolation, by accumulating sampling frequency offset between the receiver clock and a reference clock, relative to a sample timing of the prompt sample, resulting in an interpolated data sample rate reduced by an integer multiple factor compared to a received sample rate and receiving a next sample of the received samples based on the current clock signal of the receiver clock.

Digital timing correction system, method and apparatus

A technique for an equal phase combining for a robust orthogonal frequency division multiplexing (OFDM) system under high delay spread channel is disclosed. In one embodiment, a method includes receiving and synchronizing transmitted OFDM symbols having cyclic prefixes via a symbol synchronizer module, removing the cyclic prefixes from the OFDM symbols, via a cyclic prefix remover module, to form time domain symbols, converting the time domain symbols to frequency domain symbols via an FFT module, equalizing a received sub-carrier with complex conjugate of estimated channel coefficients in frequency domain at the same sub-carrier frequency via an equalizer, combining the frequency domain symbols spread over multiple sub-carriers during transmission via a combiner, and detecting phase information from the mapped combined PSK constellation symbol via a detector module.

Equal phase combining technique for a robust OFDM system

A method and device for adapting a signal is provided. The signal includes a number of recurring samples of data. In one example embodiment, the method receives recurring samples of data. Each of the samples of data includes a first number of elements. A second number of elements are selected from at least one of the recurring samples. The second number of elements is approximately less than the first number of elements. The selected second number of elements are substituted with respective phase altered elements. The subject matter also provides a method and device for identifying a signal property(ies) and a computer system for implementing these methods.

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Bengaluru, India

Amit Shaw