An electronic device includes a first antenna configured to process a first radio frequency (RF) signal within a first frequency band; a second antenna spaced apart from the first antenna configured to process a second RF within a second frequency band different from the first frequency band; a first radio frequency front end (RFFE) and a second RFFE configured to process a third RF signal within a third frequency band different from the first frequency band and the second frequency band; a communication processor electrically connected to the first switch and the second switch; and a memory operatively coupled to the communication processor and configured to store performance information having, at least, a first value indicating an efficiency of the first antenna when performing a first radio communication, and a second value indicating an efficiency of the second antenna when performing the first radio communication. The memory is configured to store instructions that, when executed, cause the communication processor to transmit or receive a signal within at least one of the first frequency band, the second frequency band or the third frequency band, and select an antenna to support the first radio communication among the first antenna and the second antenna based on the performance information having the first value or the second value. The first RFFE and the second RFFE support the first radio communication within the third frequency band.

Frequency ranges may be converted by an apparatus including a converter configured to shift an original frequency range of an input data signal to a target frequency range, an input band selective filter bank configured to route the input data signal through a bandpass filter of a selected subrange within the target frequency range, the input selective filter bank including a plurality of bandpass filters, each bandpass filter having a corresponding subrange within the target frequency range.

Methods and systems for correcting distortions of audio transmissions are provided. In one embodiment, a method is provided that includes receiving an audio transmission that includes symbols. A first portion of the audio transmission including a first subset of the symbols may be identified and compared to an expected sequence having expected symbols. One or more differences may be determined between the first subset of the symbols and the expected symbols and a movement speed between a transmitter and a receiver of the audio transmission may be determined based on the differences. A second portion of the audio transmission may be identified including a second subset of the symbols in the second subset of the symbols may be corrected based on the movement speed between the transmitter and the receiver.

The disclosed systems and methods for detecting mirror crosstalk between frequency bands equally above and below the center frequency of a Digital Subcarrier Multiplexing system include: a transmitter configured to insert zero-power symbols on half the frequency bands below center frequency, and insert other zero-power symbols, partially overlapping in time with the first zero-power symbols, on the other half of the frequency bands above center frequency. A receiver zeroes out ASE and other noises during the overlapping portion of all the zero-power symbols, then uses the power detected during the remaining portion of each zero-power symbol in each frequency band to accurately evaluate the mirror crosstalk from the corresponding frequency band on the opposite side of center frequency.

Disclosed are a local oscillator control method and system, a signal transceiving method, a terminal device, a non-transitory computer-readable storage medium and an electronic device. The local oscillator control method may include: in response to an operating resource of a scene being received and the operating resource containing a millimeter wave resource, extracting, from the operating resource, an operating frequency band in the scene; evaluating whether interference presents between the operating frequency band and a default frequency point of a millimeter wave intermediate-frequency signal; and in response to a presence of interference, acquiring a new frequency point of a local oscillator signal matched with an interference-free frequency point of an intermediate-frequency signal, and adjusting the frequency point of the local oscillator signal from a default frequency point of the local oscillator signal to the new frequency point.

A method for detecting transmitted data in a multiple-input multiple-output (MIMO) receiver, the method comprising: iteratively calculating symbol estimates by: obtaining input symbol estimates and input symbol variances; calculating error values for the input symbol estimates; refining the input symbol estimates to obtain refined symbol estimates, based on the error values, wherein the refined symbol estimates are used as input symbol estimates for the subsequent iteration of the above calculation, and wherein the refined symbol estimates are used as final symbol estimates when the difference between refined symbol estimates from one iteration to the next is below a threshold change.

A binary receiver combines a fast amplifier with a relatively slow amplifier for noise rejection. Both the fast and slow amplifiers employ hysteresis. The fast amplifier has relatively lower hysteresis, meaning that its sensitivity is a less effected by prior data values but more susceptible to glitch-induced errors. Conversely, the slow amplifier has relatively higher hysteresis and rejects glitches but introduces undesirable signal-propagation delays. A state machine taking input from both amplifiers allows the receiver to filter glitches without incurring a significant data-propagation delay.

A system for interference mitigation includes: a first transmit coupler; a receive-band noise cancellation system; a first transmit-band filter; a second transmit coupler; a first receive coupler; a transmit-band noise cancellation system; a first receive-band filter; and a second receive coupler.

In order to achieve both of reduction of peak power and reduction of a transmission rate, an apparatus includes a reception processing unit configured to receive transmission signals from a transmission apparatus, the transmission apparatus performing precoding processing and clipping processing on the transmission signals and outputting a plurality of the transmission signals simultaneously in an identical frequency band; a signal separating unit configured to separate reception data sets from the transmission signals; and a transmission signal estimating unit configured to estimate a signal distortion component and a noise component due to the clipping processing and an interference component between the transmission signals, based on the reception data sets and gain information related to a channel for transmitting the transmission signals, and estimate transmission data sets by removing the signal distortion component, the noise component, and the interference component being estimated from the reception data sets.

A reception device includes an interference cancellation unit to extract a symbol from a received signal with a first signal inserted in a time direction of a data symbol, the symbol being a signal during an interval corresponding to the first signal, to reproduce an interference signal during an interval corresponding to the data symbol, and to output a first interference-cancelled signal obtained by extracting the data symbol from a signal obtained by cancelling the interference signal from the received signal, and an interference-power estimation unit to estimate desired signal power by subtracting second average power of a symbol of a first signal, extracted from the received signal, from first average power the data symbol to estimate first noise power by subtracting the desired signal power from third average power of the data symbol, to estimate second noise power from the first noise power, and to estimate interference power by subtracting the second noise power from the second average power.