A device may selectively listen for a tracking reference signal (TRS) during connected mode discontinuous reception (CDRx) based on whether the device is to switch between repeaters of a base station (such as during travel). A device may determine whether the device is in a high speed train (HST) scenario (such as based on a difference in frequency errors generated using a synchronization signal block (SSB) and generated using a TRS, based on a trajectory of a frequency error or a frequency error difference over time, based on instantaneous frequency errors, etc.). When the device is in a HST scenario, the device listens for a TRS during CDRx, and the device generates a frequency error using the TRS. When the device is not in a HST scenario, the device prevents listening for a TRS during CDRx (with a SSB received during CDRx to be used to generate a frequency error).

A communication device includes a receiver, a transmitter and a control circuit. The receiver is configured to receive, from an infrastructure equipment of a mobile communications network, downlink signals on a downlink via a wireless access interface of the mobile communications network. The transmitter is configured to transmit, to the infrastructure equipment, uplink signals on an uplink via the wireless access interface. The control circuit is configured to control the receiver to receive the downlink signals and control the transmitter to transmit the uplink signals. The control circuit is further configured to delay a reception period for the receiver to receive the downlink signals after a transmission period in which the transmitter transmits the uplink signals when a duration of the transmission period exceeds a predetermined threshold.

Some aspects of the present disclosure relate to detection of a Phase Hit and, upon detecting the Phase Hit, determining the magnitude and location of the Phase Hit. Detecting the Phase Hit may involve comparing a phase offset difference for successive pilot symbol to a detection threshold. Determination of the detection threshold may involve a Neyman-Pearson binary hypothesis testing (NP-BHT) approach. Once the magnitude and location of the Phase Hit are known, data symbols received after the location may be processed to remove the magnitude of the Phase Hit.

Techniques for blind distributed multi-user MIMO enable simultaneous decoding of multiple concurrent wireless transmissions without the need for coordination between wireless devices or a measurement phase. Wireless devices are permitted to transmit independently and at arbitrary times. Concurrent transmissions from wireless devices superimpose in the wireless channel and are received at various base stations. The base stations forward received data samples to a central entity (e.g., a cloud computing service), which uses known preambles to reliably estimate CFOs and channels between the transmitting devices and the receiving base stations while simultaneously recovering the data samples of the individual data streams.

A communication device includes a receiver, a transmitter and a control circuit. The receiver is configured to receive, from an infrastructure equipment of a mobile communications network, downlink signals on a downlink via a wireless access interface of the mobile communications network. The transmitter is configured to transmit, to the infrastructure equipment, uplink signals on an uplink via the wireless access interface. The control circuit is configured to control the receiver to receive the downlink signals and control the transmitter to transmit the uplink signals. The control circuit is further configured to delay a reception period for the receiver to receive the downlink signals after a transmission period in which the transmitter transmits the uplink signals when a duration of the transmission period exceeds a predetermined threshold.

The embodiments described herein provide systems and methods for digital correction in low intermediate frequency (IF) receivers. Specifically, the embodiments described herein use digital correction techniques that can correct for signal distortions in low IF receivers caused by I-Q imbalance, including both I-Q magnitude imbalance and I-Q phase imbalance. In general, the embodiments described herein are implemented to at least partially cancel an image of a blocking signal in the complex digital signal. Such a cancellation can be implemented to at least partially cancel an image of blocking signal where that image occurs at or near the intermediate frequency. In one embodiment, a corrector is implemented in a low RF receiver and is configured to receive a complex digital signal that includes an image of a blocking signal. Such a low RF receiver can further include a trainer configured to train the corrector to generate the cancellation signal.

The embodiments described herein provide systems and methods for digital correction in low intermediate frequency (IF) receivers. Specifically, the embodiments described herein use digital correction techniques that can correct for signal distortions in low IF receivers caused by I-Q imbalance, including both I-Q magnitude imbalance and I-Q phase imbalance. In general, the embodiments described herein are implemented to at least partially cancel an image of a blocking signal in the complex digital signal. Such a cancellation can be implemented to at least partially cancel an image of blocking signal where that image occurs at or near the intermediate frequency. In one embodiment, a corrector is implemented in a low RF receiver and is configured to receive a complex digital signal that includes an image of a blocking signal. Such a low RF receiver can further include a corrector controller to selectively enable the corrector.

To optimally receive smart meter control messages transmitted by a concentrator, in a meter having a transceiver for bidirectional data interchange, despite its minimal resources, a current modulation reference frequency which is subject to drift is shifted by the instantaneous frequency difference between the current transmitter-side reference frequency and the current transceiver-side reference frequency in the concentrator. Therefore, the current reference frequencies correspond in the downlink without having to intervene in the meter. This frequency difference in the concentrator is obtained by comparing the current receiver-side demodulation reference frequency with the current transmitter-side reference frequency, and the current transceiver-side reference frequency, on the other hand, from messages from the transmitter of the concentrator and from the transceiver of the meter which are received using the receiver of the concentrator. A frequency-measuring comparator only needs to be connected upstream and downstream of the demodulator in the concentrator for this purpose.

A device for estimating frequency offsets which is performed by periodically transmitting training signals from a wireless local area network system. The device includes a processor and computerized codes stored in a storage unit. The processor is configured to execute the computerized code to perform a method. The method includes receiving the plurality of training signals, selecting selected training signals by a predetermined interval from the received training signals, detecting and storing phases of the selected training signals, averaging phase differences of every pair of the detected phases of the selected training signals, calculating the frequency offsets according to an average of the phase differences for every pair of the detected phases of the selected training signals, and calculating a weighted average of the calculated frequency offsets using weighting values for each of the calculated frequency offsets.

Apparatuses, methods, and systems are disclosed for configuring tracking reference signal resources. One method (500) includes receiving (502) an indication of a HST SFN transmission from at least one TRP in a network. The method (500) includes configuring (504) the UE with two TRS resources. The method (500) includes receiving (506) a downlink scheduling grant that includes a TCI codepoint indicating two TCI states corresponding to the two TRS resources. The method (500) includes configuring (508) the UE to report at least one Doppler indicator value to the network based on received TRSs. The method (500) includes identifying (510) the at least one Doppler indicator value. The method (500) includes reporting (512) the at least one Doppler indicator value to the network. The method (500) includes receiving (514) at least one DMRS port corresponding to each layer of a PDSCH, PDCCH, or a combination thereof.