An electronic device may be provided with wireless circuitry and control circuitry. The wireless circuitry may include an antenna with an inverted-F antenna resonating element formed from portions of a peripheral conductive electronic device housing structure and may have an antenna ground that is separated from the antenna resonating element by a gap. The antenna may include a first adjustable component coupled between the antenna resonating element arm and the antenna ground on a first side of the antenna feed and a second adjustable component coupled between the antenna resonating element arm and the antenna ground on a second side of the antenna feed. Control circuitry in the electronic device may adjust the first and second adjustable components between a first tuning mode, a second tuning mode, and a third tuning mode.

A wireless network includes a tunable RF transmitter in wireless communication with a master node to transmit at a first slave frequency; a tunable RF receiver in wireless communication with the master node to receive at a second slave frequency; and an RF oscillator to communicate with the RF receiver and the RF transmitter an RF oscillator frequency to determine and tune the first and second slave frequencies. The RF oscillator is configured to receive calibration information including time information or frequency information, or both, from a reference node. The RF oscillator frequency of the RF oscillator is tuned based on the calibration information from the reference node to enable communication between the slave node and the master node at the tuned RF oscillator frequency.

A method and apparatus include scanning one or more frequencies within a predetermined spectrum space designated for use by the communication network. Synchronization signals are detected on a first frequency of the scanned one or more frequencies, and a first identity value is determined from the detected synchronization signals. The method further includes receiving a first reference signal based on the determined first identity value, and receiving a broadcast channel. The broadcast channel is then decoded based on the received first reference signal, and identifying from the decoded broadcast channel a second identity value. A second reference signal is then received, based upon the first identity value and the second identity value.

A blind scan method includes setting a tuner to scan a first spectrum block with a first center frequency as a center and determining whether the first spectrum block comprises a possible signal; adjusting the tuner to scan a second spectrum block with a second center frequency as the center according to a first rise point and a first drop point when it is determined that the first spectrum block comprises the possible signal; and determining whether the second spectrum block comprises a valid signal.

A system for radio transmission, arranged in a single signal chain and including a direct digital synthesis (DDS) signal generator providing a signal within a first bandwidth; a frequency multiplier in signal communication with said DDS signal generator; said frequency multiplier adapted to convert said signal within said first bandwidth to a multiplied signal within a second bandwidth, wherein said second bandwidth encompasses a wider frequency range than said first bandwidth; a processor in communication with said DDS signal generator for programming said DDS signal generator to provide said signal within said first bandwidth; said processor further adapted to reprogram said DDS signal generator to alter said first bandwidth; a radio frequency (RF) port for transmitting said signal as a wideband signal; and, a radio frequency (RF) mixer for mixing an intermediate frequency signal with said multiplied signal to generate an RF signal; said RF port transmitting said RF signal as said wideband signal.

A system for radio transmission, arranged in a single signal chain and including a direct digital synthesis (DDS) signal generator providing a signal within a first bandwidth; a frequency multiplier in signal communication with said DDS signal generator; said frequency multiplier adapted to convert said signal within said first bandwidth to a multiplied signal within a second bandwidth, wherein said second bandwidth encompasses a wider frequency range than said first bandwidth; a processor in communication with said DDS signal generator for programming said DDS signal generator to provide said signal within said first bandwidth; said processor further adapted to reprogram said DDS signal generator to alter said first bandwidth; a radio frequency (RF) port for transmitting said signal as a wideband signal; and, a radio frequency (RF) mixer for mixing an intermediate frequency signal with said multiplied signal to generate an RF signal; said RF port transmitting said RF signal as said wideband signal.

A system for radio scanning and signal generation including a direct digital synthesis (DDS) signal generator providing a signal within a first bandwidth; a frequency multiplier in signal communication with the DDS signal generator; the frequency multiplier adapted to convert the signal within the first bandwidth to a multiplied signal within a second bandwidth, wherein the second bandwidth encompasses a wider frequency range than the first bandwidth; a processor in communication with the DDS signal generator for programming the DDS signal generator to provide the signal within the first bandwidth; the processor further adapted to reprogram the DDS signal generator to alter the first bandwidth; a radio frequency (RF) port for transmitting the signal as a wideband signal.

A method, apparatus, and system for lessening impact of connected mode mobility measurement is disclosed. A user equipment (UE) may reduce network management complexity by autonomously collecting signal quality measurements for neighboring cells. By autonomously tuning at opportune times for the UE, signal quality measurements may be obtained and reported to a serving cell. In another implementation, the UE examines the broadcast system information of both the serving base station against that of the neighboring base stations. Based on the included bandwidth information, the UE selects appropriate narrowband radio frequency subcarriers to perform signal quality measurement.

Methods and apparatus that support controlled transmission and directional reception of RTS and/or CTS messages, are described. Controlled transmission may include transmitting a same RTS message multiple times in the same direction and/or transmitting an RTS message with a length that is multiple times longer than a standard RTS message. In an aspect, a receiver may determine spatial directions of a plurality of transmitters including a first transmitter and at least one other transmitter, and may perform a beam sweep in the determined spatial directions for receiving one or more RTS messages. A transmitter may determine that a receiver is to perform a beam sweep in K different spatial directions, and may transmit a same RTS message for a data transmission K times in the same direction or an RTS message with a length approximately K times longer than a standard RTS message, during a duration of the beam sweep.

Methods and apparatus that support controlled transmission and directional reception of RTS and/or CTS messages, are described. Controlled transmission may include transmitting a same RTS message multiple times in the same direction and/or transmitting an RTS message with a length that is multiple times longer than a standard RTS message. In an aspect, a receiver may determine spatial directions of a plurality of transmitters including a first transmitter and at least one other transmitter, and may perform a beam sweep in the determined spatial directions for receiving one or more RTS messages. A transmitter may determine that a receiver is to perform a beam sweep in K different spatial directions, and may transmit a same RTS message for a data transmission K times in the same direction or an RTS message with a length approximately K times longer than a standard RTS message, during a duration of the beam sweep.