A calibration method for calibrating an electronic device is described. The method comprises: generating a test signal having a predefined bandwidth, said test signal comprising an asymmetric signal component being asymmetric in frequency domain, and said test signal further comprising a symmetric signal component being symmetric in frequency domain; processing said test signal via said electronic device, thereby generating a response signal of said electronic device to said test signal; analyzing said response signal, thereby generating measurement data comprising information on impairments due to at least one of a frequency selective channel of said electronic device and an IQ mismatch of said electronic device; and adapting at least one operational parameter of said electronic device based on said measurement data in order to calibrate the electronic device. Further, a calibration system is described.

A method and device in a UE and a base station used for wireless communications. The UE first receives a first signaling, and then transmits a first radio signal; the first signaling is used for determining K REs, and K first-type complex numbers are used for generating a baseband signal of the first radio signal through a baseband signal generation for generating an SC-FDMA baseband signal, a modulation scheme employed by the first radio signal is π/2-BPSK, K first-type parameters respectively correspond to the K first-type complex numbers, the K REs occupy contiguous subcarriers in frequency domain. The K first-type parameters are related to a center frequency of the contiguous subcarriers occupied by the K REs, each of the K first-type parameters is related to a length of cyclic prefix of an RE onto which a corresponding first-type complex number is mapped. The present disclosure improves uplink coverage performance.

Provided is a radio access network system in which a master unit compresses control management data to be allocated to a sub-channel of a public air interface (CPRI), and transmits the compressed control management data to a radio unit through a sub-channel of a public air interface, and the radio unit receives the compressed control management data through a sub-channel of a public air interface, and restores the compressed control management data.

Systems and methods are disclosed for modulating wireless signals in 5G (and future 6G) networks, to mitigate faults from noise or interference, optimize reliability, and enhance message throughput, according to some embodiments. Versions may include modulation tables for phase and amplitude modulation of message symbols in which the number of amplitude levels is different from the number of phase levels. Alternatively, the number of amplitude levels and/or phase levels may be other than a power of two. Other versions may provide a non-uniform spacing of amplitude levels or phase levels for optimal SNR throughout. Specific modulation states of the modulation table may be excluded, or declared invalid for signaling, thereby increasing the noise immunity of the remaining valid states. Embodiments of the disclosed modulation tables can provide improved signal clarity, fewer dropped messages, fewer retransmit requests, higher throughput, faster uploads and downloads, and more satisfied wireless customers overall.

An apparatus for interpolation of polar signals in RF transmitters is disclosed. The apparatus comprises an estimation circuit configured to receive an input in-phase (I) quadrature (Q) signal comprising a plurality of input IQ samples having a first sampling rate associated therewith, and determine a selection metric value indicative of a position of an IQ trajectory associated with one or more input IQ samples of the input IQ signal. The apparatus further comprises a selection circuit configured to receive the input IQ signal and the selection metric value; and adaptively provide the input IQ signal to a first interpolation circuit that implements a first interpolation method or to a second interpolation circuit that implements a second, different interpolation method, for generating interpolated polar samples at a second, different sampling rate, from the input IQ signal, based on the selection metric value.

A method of compensating for IQ mismatch (IQMM) in a transceiver may include sending first and second signals from a transmit path through a loopback path, using a phase shifter to introduce a phase shift in at least one of the first and second signals, to obtain first and second signals received by a receive path, using the first and second signals received by the receive path to obtain joint estimates of transmit and receive IQMM, at least in part, by estimating the phase shift, and compensating for IQMM using the estimates of IQMM. Using the first and second signals received by the receive path to obtain estimates of the IQMM may include processing the first and second signals received by the receive path as a function of one or more frequency-dependent IQMM parameters.

The present aspects provide apparatuses, methods, and computer-readable medium for wireless communication at a user equipment (UE), including receiving, from a base station, an in-phase and quadrature-phase tracking reference signal (IQTRS) configured for an estimation of an IQ impairment at the UE; estimating the IQ impairment based on the IQTRS; and compensating for the IQ impairment in a decoding process configured to decode one or more signals received from the base station.

Various arrangements for performing transmodulation of a forward feeder link are presented. A first data stream and a second data stream can be modulated into a higher-order modulation forward feeder link having a higher-order digital modulation scheme. A satellite can receive the higher-order modulation forward feeder link. The satellite can demodulate the higher-order modulator forward feeder link into a bit stream. This bit stream may then be remodulated and retransmitted as multiple forward user links.

An apparatus and method for in-phase/quadrature (I/Q) imbalance correction in a transceiver. The apparatus includes an I/Q imbalance correction circuit and a correction coefficient generation circuit. The I/Q imbalance correction circuit is configured to modify I/Q data in a frequency domain using correction coefficients to generate corrected I/Q data. The correction coefficient generation circuit is configured to generate the correction coefficients for the I/Q imbalance correction circuit based on the I/Q data and reference data.

This disclosure provides methods, devices and systems for pre-compensation of downlink communication based on a transmission of a request for the pre-compensation from a user equipment (UE). For example, the UE may determine an impairment at the UE that has a greater severity (a greater impact on downlink communication) or is associated with a greater amount of resources for processing relative to a remainder of a set of impairments that is experienced at the UE and the UE may transmit a request for pre-compensation of the impairment by a base station. The base station may transmit feedback to the UE indicating a confirmation of pre-compensation for the impairment by the base station or to deferment of compensation for the impairment back to the UE. If the base station acknowledges pre-compensation for the impairment, the base station may pre-compensate a downlink transmission to the UE for the impairment.