A technique includes receiving, by a user device from a base station in a wireless network, a frequency offset information (FOI), adjusting, by the user device, an uplink transmit frequency based on the frequency offset information, and transmitting, by the user device, at least one of data and control information to the base station based on the adjusted uplink transmit frequency.

Apparatuses, methods, and systems are disclosed for transmitting and/or receiving feedback. One apparatus (300) includes a transmitter (310) that transmits (802) multiple data blocks. The apparatus (300) includes a receiver (312) that receives (804) a feedback message in a time slot. The feedback message corresponds to the multiple data blocks. The feedback message includes one or more sequences that indicate feedback information, wherein the feedback information corresponds to the multiple data blocks. The feedback message includes: a sequence of a sequence set; multiple sequences of a sequence set, wherein each sequence of the multiple sequences indicates feedback information; a sequence of a sequence set in a physical resource of a physical resource set, wherein the sequence and the physical resource indicate feedback information; and/or multiple sequences of a sequence set in a physical resource of a physical resource set, wherein the multiple sequences and the physical resource indicate feedback information.

Examples of wireless OFDM communication systems are described herein which replace pilot subcarriers having known modulation with lower dual subcarriers. At the transmitter, for each resource block, the bits that modulate a few payload subcarriers are selected and then encoded with a short dual code thereby forming dual systematic bits and dual check bits. Such selected payload subcarriers are designated as upper dual subcarriers and the dual check bits modulate the lower dual subcarriers, At the receiver, for each resource block, the dual subcarriers are phase adjusted, demodulated, decoded using the short dual code, and re-modulated thereby forming the original dual subcarrier modulation without phase noise nor channel impairments. The re-modulated dual subcarriers are compared against the received dual subcarriers for channel estimation or carrier phase-locked-loop purposes. For example, prior-art OFDM systems with 4 pilots per resource block could be replaced with 8 dual subcarriers for a rate 1/2 short dual code. An increase in the number of subcarriers used for channel estimation or carrier phase-locked-loop tracking has less error in the channel estimate or phase estimate. Lower error permits lower payload BER, lower transmit power, or wider PLL bandwidth to track higher Doppler frequency shifts.

Apparatuses, methods, and systems are disclosed for transmitting and/or receiving feedback. One apparatus (300) includes a transmitter (310) that transmits (802) multiple data blocks. The apparatus (300) includes a receiver (312) that receives (804) a feedback message in a time slot. The feedback message corresponds to the multiple data blocks. The feedback message includes one or more sequences that indicate feedback information, wherein the feedback information corresponds to the multiple data blocks. The feedback message includes: a sequence of a sequence set; multiple sequences of a sequence set, wherein each sequence of the multiple sequences indicates feedback information; a sequence of a sequence set in a physical resource of a physical resource set, wherein the sequence and the physical resource indicate feedback information; and/or multiple sequences of a sequence set in a physical resource of a physical resource set, wherein the multiple sequences and the physical resource indicate feedback information.

According to an example implementation, a method for frequency offset reporting includes transmitting, by a first transceiver, a first tracking reference signal to a user device in a wireless communication system, transmitting, by a second transceiver, a second tracking reference signal to the user device, receiving, by the base station, a channel state information (CSI) reporting signal via an uplink channel, where the CSI reporting signal includes power estimation information. The method includes determining whether to pre-compensate a frequency of a downlink signal with frequency offset information based on the power estimation information, and transmitting, by at least one of the first transceiver or the second transceiver, the downlink signal with the pre-compensated frequency in response to the determination to pre-compensate the frequency of the downlink signal.

In a particular aspect, an apparatus includes first communication circuitry configured to perform first fine timing measurement (FTM) operations with respect to a device to generate first measurement data. The first FTM operation correspond to a first frequency band. The apparatus includes second communication circuitry configured to perform second FTM operations with respect to the device to generate second measurement data. The second FTM operations correspond to a second frequency band that is different than the first frequency band. The apparatus also includes a processor configured to compare the first measurement data and the second measurement data.

The transmission of data signals transmitted by a plurality of transmitters may be rendered more efficient by combining multi-user superposition coding with appropriate phase shift estimation at the receiver so that phase shift compensation at the transmitter's side may lead to a superposition of the data signals which may be demapped correctly so as to obtain information data per data signal. Owing to the combination, the concept is applicable to typical uplink situations or downlink situations of separate contributing BSs: contrary to the simple downlink situation where the data signals stem from one BS and are superimposed in one domain, namely the base station's domain, the data signals to be superimposed stem from separate transmitters, such as user entities or mobile terminals in the typical uplink situation, or different base stations in the downlink situation.

The present disclosure describes aspects of managing communication control for wireless power transfer. In some aspects, a method for managing wireless charging communications is provided. The method includes wirelessly receiving power from a wireless power transmitter and providing the wirelessly received power to a power management circuit. The method further includes providing power and a power source indication signal to a transceiver circuit. The power source indication signal is indicating the power is the wirelessly received power. The method further includes performing an initialization sequence of the transceiver circuit in response to the power source indication signal, the initialization sequence including transmitting an advertisement message to the wireless power transmitter according to a wireless power communication profile for establishing the wireless communication session with the wireless power transmitter and initializing one or more other functions defined by the wireless power communication profile after transmitting the advertisement message.

In a particular aspect, an apparatus includes first communication circuitry configured to perform first fine timing measurement (FTM) operations with respect to a device to generate first measurement data. The first FTM operation correspond to a first frequency band. The apparatus includes second communication circuitry configured to perform second FTM operations with respect to the device to generate second measurement data. The second FTM operations correspond to a second frequency band that is different than the first frequency band. The apparatus also includes a processor configured to compare the first measurement data and the second measurement data.

Methods, systems, devices, and apparatuses are described for phase noise estimation. A transmitting device identifies a phase noise metric associated with a receiving device. The phase noise metric provides an indication of the expected phase noise for the receiving device. The transmitting device selects a plurality of pilot tones adjacent to each other and a plurality of null tones for a transmission to the receiving device based on the phase noise metric. The plurality of null tones may be adjacent to and on both sides of the pilot tones in the frequency domain. The transmitting device identifies its own phase noise metric and select the pilot tones adjacent to each other and plurality of null tones in further consideration of its own phase noise metric. The receiving device may use the pilot tones and plurality of adjacent null tones to determine a phase noise estimation for the transmission.