According to one embodiment, a wireless communication apparatus includes receiver circuitry and transmitter circuitry. The receiver circuitry is configured to receive a first frame addressed to another apparatus, the first frame being transmitted by a first wireless communication apparatus, and estimate a difference between an oscillation frequency of an oscillator of the first wireless communication apparatus and an oscillation frequency of an oscillator of the wireless communication apparatus based on the first frame. The transmitter circuitry is configured to transmit a third frame at a frequency determined based on the difference during a period at least partially overlapping a period during which the first wireless communication apparatus transmits a second frame addressed to a second wireless communication apparatus.

The present invention offers significant improvements in the performance of a radio receiver operating in an environment with high desired band interference. The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio receivers that are implemented with the popular direct conversion radio receiver architectures.

A radio frequency transceiver is disclosed herein. The radio frequency transceiver comprises a transmitter, a receiver comprising a full complex mixer capable of operating as a frequency down-converter, and an in-phase and quadrature (IQ) imbalance calibration module. The IQ imbalance calibration module is connected with (e.g., only connected with) the transmitter. The IQ imbalance calibration module is arranged calibrate the transmitter to reduce its IQ imbalance. The IQ imbalance calibration module is not arranged calibrate the receiver. Use of the full complex mixer in the receiver eliminates the need for calibrating the receiver.

A radio frequency transceiver is disclosed herein. The radio frequency transceiver comprises a transmitter, a receiver comprising a full complex mixer capable of operating as a frequency down-converter, and an in-phase and quadrature (IQ) imbalance calibration module. The IQ imbalance calibration module is connected with (e.g., only connected with) the transmitter. The IQ imbalance calibration module is arranged calibrate the transmitter to reduce its IQ imbalance. The IQ imbalance calibration module is not arranged calibrate the receiver. Use of the full complex mixer in the receiver eliminates the need for calibrating the receiver.

A system comprises a modem, configured to transmit data modulated based on an intermediate frequency within one of a C, X, or Ku band, and a single-stage block-up converter having an input electrically coupled via one inter-facility link cable to the modem, and an output electrically coupled to a high-power amplifier. The single-stage block-up-converter is configured to up-convert the intermediate frequency to a satellite communication frequency within the Ka, Q, or V band.

A receiver and a receiving method of the receiver such that monolithic integration of multiple receiving channels can be implemented. The receiver includes a zero intermediate frequency channel, performing in-phase/quadrature (IQ) down conversion on a radio frequency signal at a first frequency band using a frequency division or frequency multiplication signal of a first signal, and a superheterodyne channel, performing down conversion on a radio frequency signal at a second frequency band using the frequency division or frequency multiplication signal of the first signal, where the first frequency band is different from the second frequency band. The zero intermediate frequency channel and the superheterodyne channel use a same oscillation signal or a same frequency division or frequency multiplication signal of the oscillation signal, thereby monolithic integration of multiple receiving channels can be implemented.

A receiver and a receiving method of the receiver such that monolithic integration of multiple receiving channels can be implemented. The receiver includes a zero intermediate frequency channel, performing in-phase/quadrature (IQ) down conversion on a radio frequency signal at a first frequency band using a frequency division or frequency multiplication signal of a first signal, and a superheterodyne channel, performing down conversion on a radio frequency signal at a second frequency band using the frequency division or frequency multiplication signal of the first signal, where the first frequency band is different from the second frequency band. The zero intermediate frequency channel and the superheterodyne channel use a same oscillation signal or a same frequency division or frequency multiplication signal of the oscillation signal, thereby monolithic integration of multiple receiving channels can be implemented.

An IQ generator capable of consuming lower power and occupying smaller die area. The IQ generator is configured without any synthesizer and divide-by-2 circuitry. The IQ generator may be configured to convert one or more phase outputs of a test tone generator (TTG) into I and Q signals. The IQ generator may receive as inputs differential outputs of a single phase of a TTG and/or multiple phase outputs of a TTG. The IQ generator may include one or more delay paths configured to generate the I and Q signals, and a calibration circuitry configured to compare the average pulse widths of the I and Q signals and provide one or more control signals to the one or more delay paths such that the I and signals are orthogonal in phase.

An IQ generator capable of consuming lower power and occupying smaller die area. The IQ generator is configured without any synthesizer and divide-by-2 circuitry. The IQ generator may be configured to convert one or more phase outputs of a test tone generator (TTG) into I and Q signals. The IQ generator may receive as inputs differential outputs of a single phase of a TTG and/or multiple phase outputs of a TTG. The IQ generator may include one or more delay paths configured to generate the I and Q signals, and a calibration circuitry configured to compare the average pulse widths of the I and Q signals and provide one or more control signals to the one or more delay paths such that the I and signals are orthogonal in phase.

For example, an apparatus may include a Local Oscillator (LO) generator configured to generate a distributed modulated LO signal by modulating an LO signal based on a reset signal; and a plurality of Physical Layer (PHY) chains to receive the distributed modulated LO signal, which is distributed to the plurality of PHY chains by the LO generator, a PHY chain of the plurality of PHY chains including a reset detector configured to detect the reset signal based on the distributed modulated LO signal, and, based on a detection of the reset signal, to reset one or more Radio Frequency (RF) elements of the PHY chain.