Hughes Network Systems, LLC

Minheng Shan

Kumud Patel

Kumudchandra Patel

Walter Robert Kepley, Iii

Daniel Raymond Wendling

Guojun Chen

Sachin Lal

Mark Steber

Kumudchandra Shantilal Patel

A processor can be configured to execute instructions stored in the memory to position a first point in a grid space that represents an unmodulated signal component of a first signal based on a characteristic of a frequency modulator generating the first signal. The frequency modulator can include a first input to receive data from a baseband source and can include a second input to receive a second signal from a local oscillator. The processor can determine, in the grid space, a first angle between a first line segment from a reference point to the first point and a second line segment from the first point to a point representing the first offset signal applied to the frequency modulator. The processor can additionally apply a second offset signal, based on the first angle, to compensate for the characteristic of the frequency modulator.

Frequency modulation in a communications network

In some implementations, a radiofrequency down converter comprises an input port to receive a radiofrequency input signal, and the down converter includes a first bandpass filter configured to filter the input signal. The down converter includes a mixer stage coupled to the bandpass filter, the mixer stage being configured to generate a mixer output signal by processing the filtered input signal using a gain adjustment device, one or more amplifiers, and a mixer. The down converter includes a signal adjustment stage coupled to receive the mixer output signal, the signal adjustment stage comprising: a temperature compensation device configured to compensate for changes in signal gain due to changes in temperature; a second bandpass filter; a gain adjustment device; one or more amplifiers; and a low pass filter. The down converter comprises an output port coupled to output an adjusted mixer output signal from the signal adjustment stage.

Q-band block down converter

Devices, systems, methods, and non-transitory media facilitate image rejection for a radio frequency signal with a wideband carrier. Wideband signals from a device may be analyzed, the wideband signals corresponding to a wideband channel. Each wideband signal may correspond to a sinusoidal electrical signal with IQ amplitude and phase modulation. An in-phase component (I) of a wideband signal may be determined. A quadrature component (Q) of the wideband signal may be determined. Based on the determined I and Q, a wideband IQ imbalance may be determined. A scalar error based on the wideband IQ imbalance may be obtained. The scalar error may be mapped to a vector error plane. Orthogonal error vector points that are based on the mapping may be determined. The wideband IQ imbalance of the device may be compensated based on adjusting an IQ setting of the device with the orthogonal error vector points.

Systems and methods for fast searching of wideband IQ modulation image rejection

A dual-mode switchable power control circuit for an RF transmit signal path of an RF transmitter is switchable between an open-loop automatic gain control (AGC) mode and a closed-loop automatic level control (ALC) mode in the analog domain to provide power control for the RF transmit signal path. The open-loop AGC mode and the closed-loop ALC mode are both controlled based on the analog control signal on the same control line. In the open-loop AGC mode, the analog control signal corresponds to the AGC control voltage indicating a setpoint gain for the RF transmit signal path. In the closed-loop ALC mode, the analog control signal corresponds to an ALC reference voltage indicating a setpoint power output level for the RF transmit signal path.

Dual mode power control circuits for RF transmitters

Methods and apparatuses for enhancing flatness of frequency response of couplings of radio frequency (RF) ports in an RF switch matrix. Techniques include determining a second RF port has been selected to be coupled to a first RF port via a coupling, obtaining an indication of a frequency or frequencies to be carried via the coupling, determining an amount of attenuation or amplification for the coupling for the frequency or frequencies, and adjusting attenuation or amplification applied to the coupling according to the determined amount attenuation or amplification.

Gain/flatness enhancement for RF switch matrix

A method including determining that a first radio frequency (RF) port has been selected to be coupled via an M by N RF switch matrix to a second RF port, wherein the M by N radio frequency (RF) switch matrix includes M first-side RF ports and N second-side RF ports, the first RF port is included in the M first-side RF ports, the second RF port is included in the N second-side RF ports, M is at least 2 and N is at least 2, and each of the first-side RF ports may be selectively coupled to and uncoupled from at least one of two or more of the second-side RF ports, such that RF signals are carried between selectively coupled RF ports; obtaining a first indicator indicating a frequency, frequency range, channel, or band for an RF signal to be carried via the second RF port while coupled to the first RF port; obtaining, in response to the determination that the first RF port has been selected to be coupled to the second RF port, a first adjustment value based on the first indicator, the first RF port, and the second RF port; and causing a first amplitude adjustment device configured to attenuate and/or amplify an RF signal as it passes through the first RF port or the second RF port with a selectable amount of attenuation and/or amplification to select a first amount of attenuation and/or amplification determined based on the first adjustment value.

An approach includes injecting a plurality of equal amplitude tones across a frequency band. The approach also includes determining frequency response based on the injected tones, determining an imbalance parameter associated with a quadrature down-converter based on the determined frequency response; determining one or more parameters for wideband quadrature compensation based on the determined frequency response, and compensating an input signal based on the determined imbalance parameter and the determined one or more parameters for the wideband quadrature compensation.

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Rockville, MD, United States of America

Minheng Shan