Qualcomm Incorporated

General Instrument Corporation

Broadband Innovations, Inc.

Cong Nguyen

Joseph Patrick Burke

Insoo Hwang

Bongyong Song

Tingfang Ji

Peter Pui Lok Ang

Stephen Jay Shellhammer

Bruce A Judson

Peter David Heidmann

Joseph Binamira Soriaga

Vijayalakshmi Rajasundaram Raveendran

Branislav A Petrovic

Vladimir Aparin

Wanshi Chen

Wei Zeng

Seyedkianoush Hosseini

Naga Bhushan

Yi Huang

Krishna Kiran Mukkavilli

Jing Jiang

Muhammad Sayed Khairy Abdelghaffar

Samir Salib Soliman

Ahmed Kamel Sadek

Abdelrahman Mohamed Ahmed Mohamed Ibrahim

Igor Gutman

Roberto Rimini

Yu Albert Wang

Sanghoon Kim

Babak Aryan

Pushkar Bajirao Kulkarni

Yong Jin Kim

Jae-Hee Choi

Won-ick Lee

An apparatus is disclosed for frequency-based predistortion signal generation. In an example aspect, the apparatus includes a predistortion linearizer circuit configured to be coupled to an input of an amplifier. The amplifier has non-linearities associated with multiple frequencies. The multiple frequencies include a first subset of frequencies and a second subset of frequencies. The predistortion linearizer circuit is also configured to accept an input signal. The predistortion linearizer circuit is additionally configured to generate, based on the input signal, a compensation signal to attenuate the non-linearities existing within the first subset of frequencies more than the non-linearities existing within the second subset of frequencies. The predistortion linearizer circuit is further configured to generate a pre-distorted signal based on the input signal and the compensation signal.

Frequency-based predistortion signal generation

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be capable of operating according to a first transmission efficiency operating mode and a second transmission efficiency operating mode that is less power efficient than the first transmission efficiency operating mode. The first transmission efficiency operating mode may be associated with a first undesired emission level that is greater than a second undesired emission level associated with the second transmission efficiency operating mode. The UE may select to operate in one of the two transmission efficiency operating modes based on one or more communication parameters (e.g., indicated by control signaling received from a base station). For example, the UE may select to operate in the first transmission efficiency operating mode based on determining that one or more of the communication parameters satisfies at least one parameter criterion for operating in the first transmission efficiency operating mode.

User equipment operation in a high efficiency transmission operating mode

Systems and methods are disclosed for enhancing the power efficiency of low power internet of everything (IOE) devices or user equipments (UEs). A UE or IOE having a low power companion receiver maintains its full power receiver in a sleep state until it receives a wake up indicator from a base station. In response to the wake up signal, the UE or IOE powers up its full power receiver and receives data from the base station. The base station further schedules the wake up signals so as not to collide with control signals expected by UEs or IOEs without low power receivers, or those UEs and IOEs are configured to detect and react to the wake up signals.

Downlink multiplexing and MAC signaling for a system with devices operating with and without low power companion receivers

A multimedia device engaged in wireless transmission of content to a remote display may format graphical user interface content for the remote display. The device may also communicate with a human interface device such as a remote control. The remote control may send control information to the multimedia device to control the remote display.

Controlling a multimedia device in remote display mode

Aspects of the disclosure are directed to interference cancellation. A method for performing interference cancellation in a wireless communications device having a transmitter, a receiver, a coefficient controller, an analog interference cancellation (AIC) circuit and a receive local oscillator (LO) includes utilizing a receive local oscillator (LO) to generate a transmit pilot; injecting the transmit pilot into a transmit chain for transmission; utilizing a receiver to receive a signal, wherein the signal includes the transmit pilot and an interference signal; and determining a set of coefficients for the interference cancellation based on an output signal from the receiver.

Pilot-based analog active interference canceller

Aspects of the disclosure are directed to interference cancellation and wireless communication. A method of performing analog interference cancellation in a wireless communications device having a transmitter and a receiver includes receiving a reference signal representative of an interfering signal transmitted by the transmitter, selecting a first target interference type from one of a plurality of interference types affecting a an RF signal received by the receiver, configuring a first filter of an interference cancellation circuit using a coefficient computed based on the first target interference type, and cancelling interference in the RF signal using an output of the first filter. Coefficient computation may be performed in a switched manner between analog and digital domain, simultaneously in multiple domains, or in a cascaded manner that provides digital interference cancellation.

Switched, simultaneous and cascaded interference cancellation

When embedding a signal into a selected subcarrier of a multicarrier downlink waveform of regular data/control signaling, a base station modulates the embedded signal with a different modulation scheme than the other data in the downlink waveform. The base station nulls adjacent subcarriers to minimize interference at a low-power wake-up receiver of an IOE device(s). The IOE device wakes up the low-power wake-up receiver at scheduled times to listen for the signal. For synchronization signals, the IOE device corrects a local clock based on a correlation value of the signal to a predetermined sequence. For wake-up signals, the IOE device correlates whatever is detected at the antenna to a predetermined sequence and compares the correlation value to a predetermined threshold. If the threshold is met, the IOE device registers a wake-up signal and wakes the primary transceiver of the device. If not, the receiver goes back to sleep.

Embedded wake-up signaling

A device may use enhanced power amplifier (PA) linearization techniques such as adaptive feed-forward (FF) linearization using adaptive filters. In one example, an adaptive feed-forward linearizer may isolate a distortion signal based at least in part on the signals input to and output from a PA in a transmission path. The distortion signal may be used to cancel distortion at the output of the PA to produce an improved output signal. A first adaptive circuit may be used to produce the distortion signal and a second adaptive circuit may be used to produce an error cancellation signal based at least in part on the distortion signal. The error cancellation signal may be amplified and re-introduced to the transmission path to produce the improved output signal. Semi-adaptive circuits may be used in place of the adaptive circuits, or a hybrid approach may be used.

Adaptive feed-forward power amplifier linearization methods using adaptive filters

Aspects of the disclosure are directed to interference cancellation. A method of performing interference cancellation in a wireless communications device having one or more transmit antennas, one or more transmitters, one or more receive antennas, one or more receivers, one or more coefficient controllers and one or more analog interference cancellation (AIC) circuits includes using the one or more coefficient controllers for determining coefficients for one or more adaptive filters within the one or more AIC circuits.

Radio frequency (RF) analog interference cancellation (AIC) with multiple antennas

A wireless device is described. The wireless device includes an antenna. The wireless device also includes a hybrid transformer. The wireless device further includes a frequency matching termination port. The frequency matching termination port provides impedance matching with the antenna at multiple frequencies. The frequency matching termination port may include multiple resistors, inductors and capacitors that can be switched in/out.

Dual/wideband termination for hybrid transformer

Exemplary embodiments are directed to systems, devices, and methods for mitigating effects of transmit signal leakage. A transceiver may include a transmitter and a receiver. The transceiver may further include a multi-tap analog adaptive filter coupled to each of the transmitter and the receiver and configured to generate an estimated transmit leakage signal based on at least a portion of a transmit signal from the transmitter and an error signal from the receiver.

Multi-tap adaptive filter for transmit signal leakage cancellation

Aspects of the disclosure are directed to interference cancellation and wireless communication including determining the strength of a reference signal; comparing the strength of the reference signal to a first threshold and a second threshold; and performing one of the following: updating at least one coefficient if the strength of the reference signal is above the first threshold; freezing the at least one coefficient if the strength of the reference signal is between the first threshold and the second threshold; or setting an interference cancelation (IC) circuit to OFF if the strength of the reference signal is below both the first threshold and the second threshold.

Multi-layer coefficient control for dynamic interference cancellation

One feature provides a method for transmitting content to a receiving device, by establishing channel hopping sequence information with the receiving device via a first communication band. The channel hopping sequence information is associated with a plurality of traffic channels within a second communication band. Moreover, the method entails transmitting the content to the receiving device through the plurality of traffic channels via the second communication band using a channel hopping scheme implemented according to the channel hopping sequence information. In one embodiment, establishing the channel hopping sequence information with the receiving device via the first communication band further includes: obtaining a channel hopping sequence key; and transmitting the channel hopping sequence key to the receiving device within the first communication band.

Channel hopping based content protection having an out-of-band communication band

A preselect circuit maintains the dynamic range of a received RF input signal during bandpass filtering of the received RF input signal. The preselect circuit includes a Q-deficient passive bandpass filter for coupling to an antenna to receive a received RF input signal. The preselect circuit further includes a Q-enhancement circuit coupled to the Q-deficient passive bandpass filter, wherein the Q-enhancement circuit increases a Q-value of the Q-deficient passive bandpass filter by compensating for resistive inductive losses in the bandpass filter.

High dynamic range receiver front-end with Q-enhancement

Methods and apparatus for providing a wireless expansion network. In an aspect, an apparatus includes an expansion circuit configured to identify at least one of a selected uplink (UL) channel and a selected downlink (DL) channel that are provided by one of a primary network and an expansion network, and a processing circuit configured to switch to the at least one of the selected UL and DL channels. An apparatus includes means for obtaining link parameters associated with a primary network and an expansion network, means for identifying clients that are assigned transmission channels on both the primary network and the expansion network based on the link parameters, and means for transmitting messages to the clients to indicate the assigned transmission channels.

Growing community of inventors

San Diego, CA, United States of America

Cong Nguyen