The present disclosure relates to opportunistically selecting an antenna in an electronic device having multiple antennas. A baseband processor of the electronic device may connect to a first cellular tower providing cellular service at a first frequency using a first antenna of the electronic device. The baseband processor may then receive an indication of a handover event to a second cellular tower operating at a second frequency. The baseband processor may determine signal measurements of the second cellular tower for each antenna of the electronic device that is capable of operating at the second frequency. The baseband processor may execute a handover to the second cellular tower using the antenna associated with the best performing signal measurements. In this manner, an antenna may be opportunistically selected based on performance of the antenna, improving operation of the electronic device and quality of cellular service.

A method of placing a node (10) in a wireless communication network into a standby mode, said node (10) comprising a plurality of antennae (13, 14), a primary radio (11) and a secondary radio (12) wherein said primary radio (11) and said secondary radio (12) share at least two of said plurality of antennae (14), said node (10) further comprising a Radio Frequency, RF, switch (15) arranged to connect said secondary radio (12) to any one of said at least two shared antennae (14), wherein said primary radio (11) is arranged to operate within a first frequency band, and wherein said secondary radio (12) is arranged to operate within a second frequency band, wherein said second frequency band is a sub-band of said first frequency band, said method comprising the steps of receiving (110) a packet; determining (120) for each of said shared antennae (14) separately, a signal quality indicator of said second frequency band corresponding to said received packet; selecting (130) one of said shared antennae (14) based on said determined signal quality indicators by controlling said RF switch (15) such that said selected antenna connects to said secondary radio (12); placing (140) said node (10) in a standby mode, wherein in said standby mode, said secondary radio (12) is arranged to listen to an activation signal in said second frequency band through said connected antenna for activating said node (10).

A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals.

Apparatuses, systems, and methods for a wireless device to perform a method including performing one or more of periodic beam quality measurements and/or event based beam quality measurements, determining, based at least in part on one or more of the periodic beam quality measurements and/or the event based beam quality measurements, a recommended beam quality measurement configuration, and transmitting, to a base station serving the UE, the recommended beam quality measurement configuration. In addition, the UE may perform receiving, from the base station, instructions regarding the beam quality measurement configuration. The instructions may include instructions to activate, deactivate, and/or modify at least one beam quality measurement configuration. In addition, the instructions may be based, at least in part, on the recommended beam quality measurement configuration.

The disclosure relates to a method for processing a communication path in a portable communication device, which includes: identifying whether at least some of a plurality of active elements included in a communication circuit disposed between an antenna and a communication processor are in an abnormal state and, based on an abnormal state of a first active element supporting delivery of a signal of a first frequency band among the plurality of active elements being detected, controlling the portable communication device to deliver the signal of the first frequency band based on a second active element different form the first active element among the plurality of active element, and a portable communication device supporting the same.

A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals.

Techniques for reducing the impact of specific absorption rate (SAR) based on a transmit power back-off value in multi-antenna mobile devices are provided. An example mobile device includes a first radio frequency resource associated with first specific absorption information, a second radio frequency resource associated with second specific absorption information, and a processor configured to generate a first signal associated with a first quality of service, generate a second signal associated with a second quality of service, cause the first signal to be transmitted over one of the first radio frequency resource and the second radio frequency resource based at least in part on the first specific absorption information and the second specific absorption information, and cause the second signal to be transmitted over whichever of the first radio frequency resource and the second radio frequency resource is not used to transmit the second signal.

Methods, systems, and devices for wireless communications in millimeter wave (mmW) systems are described. A mmW wireless device may identify a plurality of subsets of antennas from available antennas. The wireless device may compare effective array gain values for each subset in the plurality of subsets of antennas. An effective array gain value may be determined based on a realized array gain for each subset normalized or penalized by a radio frequency (RF) power consumption for antennas corresponding to each subset in the plurality of subsets of antennas. Based on the comparison, the wireless device may select one or more subsets of the plurality of subsets of antennas, the selected one or more subsets may correspond to antenna combinations of one or more antenna subarray units. The mmW wireless device may then communicate using the selected one or more subsets.

Techniques are described for wireless communication at a user equipment (UE) having a plurality of antenna sub-arrays. One method includes performing an initial acquisition procedure with a base station using each antenna sub-array of a first subset of antenna sub-arrays, in which the first subset includes two or more antenna sub-arrays of the plurality of antenna sub-arrays; selecting an antenna sub-array from the first subset; and performing a random access procedure with the base station using the selected antenna sub-array. Another method includes performing a random access procedure with a base station using a first antenna sub-array in the plurality of antenna sub-arrays; selecting a second antenna sub-array in the plurality of antenna sub-arrays to use for communication with the base station after performing the random access procedure; and transmitting to the base station, on a beam, a scheduling request state indicating the selected second antenna sub-array.

A plurality of multicarrier signals is generated. Each of the plurality of multicarrier signals includes a pilot symbol sequence at a same temporal point in each multicarrier signal. Each pilot symbol sequence includes a plurality of pilot symbols with non-zero amplitude. A quantity of the plurality of pilot symbols in each pilot symbol sequence is greater than or equal to a quantity of the plurality of multicarrier signals to be transmitted. The plurality of multicarrier signals are transmitted in an identical frequency band from a plurality of antennas.