Abstract: Transmit/receive switches and methods for radio control include connecting a first reactive impedance in parallel with a power amplifier on a transmit path during reception to neutralize a reactive impedance of the power amplifier and to prevent received signals from entering the transmit path. The first reactive impedance is disconnected during transmission.

Abstract: A multi-mode access point supports different radio access technologies (e.g., Wi-Fi and cellular) for serving multi-mode access terminals. To provide improved service for such an access terminal, the access point may redirect the access terminal from a first type of radio access technology to a second type of radio access technology under certain circumstances. A decision to invoke such a redirection may be based on, for example, at least one of: traffic conditions on the first type of radio access technology, traffic conditions on the second type of radio access technology, and whether a backhaul for the access point is currently a bottleneck for access point communication.

Abstract: Switching network for diversity receivers. In some embodiments, a receiver can include an input node and an output node, and a first amplification path having a first amplifier implemented between the input node and the output node. The receiver can further include a second amplification path having a second amplifier implemented between the input node and the output node. The receiver can further include a switch implemented to selectively couple the first amplification path and the second amplification path.

Abstract: RF filtering circuitry includes a first input/output node, a second input/output node, a common node, first filtering circuitry, second filtering circuitry, and transmit signal cancellation circuitry. The first filtering circuitry is coupled between the first input/output node and the common node, and is configured to pass RF transmit signals within one or more transmit signal frequency bands while attenuating signals outside the one or more transmit signal frequency bands. The second filtering circuitry is coupled between the second input/output node and the common node, and is configured to pass RF receive signals within one or more receive signal frequency bands while attenuating signals outside the one or more receive signal frequency bands. The transmit signal cancellation circuitry is coupled between the common node and the second input/output node and is configured to generate a transmit cancellation signal from the RF transmit signals.

Abstract: Full duplex transceivers are provided, the transceivers comprising: a transmitter section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals; a receiver section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals; an analog self-interference canceller that, in response to the analog baseband signals in the analog portion of the transmitter section, produces analog cancellation signals that cancel first self-interference in the analog baseband signals in the analog portion of the receiver section; and a digital self-interference canceller that, in response to the digital baseband signals in the digital portion of the transmitter section, produces digital cancellation signals that cancel second self-interference in the digital baseband signals in the digital portion of the receiver section.

Abstract: A global navigation satellite system receiver with filter bypass mode for improved sensitivity is disclosed. In an aspect, an apparatus is provided that includes a non-bypass signal path coupled to a receiver, the non-bypass signal path comprising a filter. The apparatus also includes a bypass signal path coupled to the receiver, the bypass signal path configure to bypass the filter, and a switch to couple an antenna to the non-bypass signal path during time intervals when signals transmitted by an unrelated local transmitter are transmitted with a signal power that exceeds a selected threshold, and to couple the antenna to the bypass signal path during other time intervals.

Abstract: The apparatus includes a transmission signal divider for dividing and transmitting a received signal to a transmission antenna and an attenuator, an attenuator for applying a predetermined attenuation factor to the transmitted signal divided to the attenuator, a phase shifter for phase-shifting the signal to which the attenuation factor is applied by a predetermined phase, and a time delayer for time-delaying the phase-shifted signal by a predetermined time.

Abstract: Radio frequency systems with transmit and receive isolation are provided. In certain configurations, a wireless device includes a power amplifier including a power amplifier output configured to provide a transmit signal, one or more duplexers including a first duplexer associated with a first frequency band, a plurality of antennas including a first antenna and a second antenna, a plurality of switches, and an isolation detection system. The plurality of switches are configured to selectively connect the power amplifier output to the first antenna via a selected path chosen from a plurality of signal paths, including a first signal path through the first duplexer and a duplexer bypass path that bypasses the one or more duplexers. Additionally, the isolation detection system is configured to control the selected path of the plurality of switches based on detecting an amount of antenna coupling between the first antenna and the second antenna.

Abstract: A communication device includes a ground element and an antenna element. The antenna element is disposed adjacent to an edge of the ground element. The antenna element includes a first metal element and a second metal element. The first metal element has a first end and a second end. The first end is coupled through a capacitive element to a communication module. The second end is coupled through a shorting element to the ground element. The second metal element has a third end and a fourth end. The third end is coupled to the communication module. The fourth end is open. The first metal element and the second metal element are adjacent to each other, but not connected to each other. The first metal element and the second metal element have projections on the edge of the ground element, wherein the projections do not overlap with each other.

Abstract: Systems, methods, and instrumentalities are disclosed that may provide assistance across networks using different radio access technologies. A centralized gateway CGW (210, 710) may be provided to facilitate the assistance via client devices in the networks (220). The CGW (210, 710) and client devices may use a common protocol (311) and common interface to take actions relating to the assistance (780).

Abstract: Radio frequency (RF) front end circuitry includes RF filtering circuitry with first multiplexer circuitry and second multiplexer circuitry. The first multiplexer circuitry is used to pass primary RF transmit and receive signals within one or more frequency division duplexing (FDD) operating bands and diversity multiple-input-multiple-output (MIMO) receive signals within one or more time division duplexing (TDD) operating bands between transceiver circuitry and one or more antennas. The second multiplexer circuitry is used to pass primary RF transmit and receive signals within the one or more TDD operating bands and diversity MIMO receive signals within the one or more FDD operating bands between the transceiver circuitry and the one or more antennas.

Abstract: Embodiments of the present invention provide an apparatus and a method for interference cancellation. The apparatus includes: a splitter, configured to acquire a first transmit signal and a second transmit signal; a first circulator, configured to transmit the first transmit signal to an antenna and to send a to-be-processed signal to a combiner, where the to-be-processed signal includes a receive signal component and a self-interference signal component, the self-interference signal component corresponds to an interference signal generated due to that the antenna reflects the first transmit signal; a second circulator, configured to: transmit the second transmit signal to an equivalent load, and acquire a reference signal generated due to that the equivalent load reflects the second transmit signal, where an impedance of the equivalent load corresponds to an impedance of the antenna; and a combiner, configured to cancel the self-interference signal component according to the reference signal.

Abstract: An electronic device is provided. The electronic device includes a first antenna, a second antenna, a transmission/reception path unit, a first reception path unit, a second reception path unit including a low noise amplifier (LNA), a signal path selection unit configured to connect each of the first antenna and the second antenna to the transmission/reception path unit, the first reception path unit, or the second reception path unit, and a radio frequency integrated circuit (RFIC) module or a processor including the RFIC module configured to control the signal path selection unit to have a first state in which the first antenna is connected to the transmission/reception path unit and the second antenna is connected to the second reception path unit or control the signal path selection unit to have a second state in which the first antenna is connected to the first reception path unit and the second antenna is connected to the transmission/reception path unit.

Abstract: This disclosure provides systems, methods, and apparatus for antenna switching for simultaneous communication. In one embodiment, a wireless communication apparatus is provided. The wireless communication apparatus includes a plurality of antennas including a first antenna and a second antenna. The wireless communication apparatus further includes a plurality of transmit circuits including a first transmit circuit. The wireless communication apparatus further includes a controller configured to selectively switch the first transmit circuit from transmitting wireless communications via the first antenna to transmit wireless communications via the second antenna based on one or more uplink performance characteristics of at least one of the first antenna and the second antenna. Other aspects, embodiments, and features are also claimed and described.

Abstract: Techniques and apparatuses for wireless communication are described herein. According to some possible aspects, a base station may determine a random number to be used in association with performing a clear channel assessment (CCA) in a licensed assisted access (LAA) network. The base station may determine the random number in coordination with one or more other random numbers determined by one or more other base stations. The base station may determine, based on the random number, a time to perform the CCA to reduce or prevent conflicts with the one or more other base stations.

Abstract: An apparatus for reducing interference and improving communication quality for RF communications over mm-wave frequency bands between wireless communications devices. In one embodiment, for example, the apparatus comprises a plurality of high-gain directional antenna elements each configured to maximally radiate in different directions relative to the apparatus. The apparatus also includes a RFIC chip electrically coupled to the plurality of antenna elements and configured to switch from driving any one of the directional antenna elements to driving another of the directional antenna elements thereby providing a multi-directional or near omni-directional radiation capability for a wireless communications device.

Abstract: A Radio Frequency (RF) front end system and method are disclosed. The RF front end system comprises an antenna, a matching network coupled to the antenna, a power amplifier (PA) coupled to the matching network via a port on a transmit path, a low noise amplifier (LNA) coupled to the matching network via the port on a receive path and at least one transmit/receive switch (T/R SW) coupled between the port and at least one of the PA and LNA.

Abstract: RF front-end circuitry, which includes a first RF low noise amplifier (LNA) and a first reconfigurable RF filter, is disclosed. The RF front-end circuitry operates in one of a group of operating modes. The first reconfigurable RF filter, which has a first reconfigurable RF filter path, includes a first receive (RX) shunt switching element coupled between the first reconfigurable RF filter path and ground. The first reconfigurable RF filter path is coupled to an input of the first RF LNA. The group of operating modes includes a first operating mode and a second operating mode. During the first operating mode, the first RX shunt switching element is ON. During the second operating mode, the first RX shunt switching element is OFF and the first RF LNA receives and amplifies a first filtered RF receive signal from the first reconfigurable RF filter to provide a first receive signal.

Abstract: A tapped delay line channel model may be employed to suppress the self-interference that is introduced, at a receiver input, by a signal at a transmitter output. The self-interference may be considered to have components introduced by the internal antenna subsystem of a full duplex MIMO transceiver.

Abstract: A wireless device having a first tunable antenna tuned to a first frequency band; and a second tunable antenna tuned to a second frequency band that is different than the first frequency band, wherein the first and second antennas are configured to transmit, receive, or a combination of transmit and receive transmission signals by carrier aggregation at the respective first and second frequency bands simultaneously.

Abstract: An integrated circuit architecture and circuitry is defined by a die structure with a plurality of exposed conductive pads arranged in a grid of rows and columns. The die structure has a first operating frequency region with a first transmit and receive chain, and a second operating frequency region with a second transmit chain and a second receive chain. There is a shared region of the die structure defined by an overlapping segment of the first operating frequency region and the second operating frequency region with a shared power supply input conductive pad connected to the first transmit chain, the second transmit chain, the first receive chain, and the second receive chain, and a shared power detection output conductive pad connected to the first transmit chain and the second transmit chain.

Abstract: An integrated circuit, including: at least three integrated circuit portions mutually spaced on a single electrically insulating die, the integrated circuit portions being mutually galvanically isolated; and signal coupling structures on the die to allow communication of signals between the integrated circuit portions while maintaining the galvanic isolation therebetween.

Abstract: A transceiver or RF front end employing a transformer with a low loss transmit/receive (T/R) switch circuit in the ground path. In various embodiments, differential outputs of a power amplifier are coupled to the first winding of the transformer, while the input of a low noise amplifier is coupled to the second side of the transformer via a matching inductor. The T/R switch circuit, which may be a thin oxide CMOS transistor, is coupled between the second side of the transformer and ground. In operation, the T/R switch circuit may be enabled during transmit mode operations of the power amplifier, such that a low impedance path to ground is provided at the input of the low noise amplifier, thereby protecting it from high voltage swings generated by the power amplifier.

Abstract: An antenna on a sapphire structure. The antenna includes a sapphire structure having a first side, and a second side positioned opposite the first side. The antenna also includes a first antenna trace positioned on the first side of the sapphire structure, and a second antenna trace positioned on the second side of the sapphire structure. Additionally, the antenna includes at least one via formed through the sapphire structure. The at least one via electrically connects the first antenna trace to the second antenna trace.

Abstract: A signal transceiver is provided. The signal transceiver includes: signal convert circuit adapted to convert single-ended signals into differential signals; first power amplifier; receiving amplifier; impedance convert circuit; first capacitive circuit; second capacitive circuit; and first switch circuit; wherein output terminals of the signal convert circuit are connected with output terminals of the first power amplifier and first set of terminals of the first capacitive circuit; second set of terminals of the first capacitive circuit is connected with first set of terminals of the impedance convert circuit; second set of terminals of the impedance convert circuit is connected with input terminals of the receiving amplifier and first set of terminals of the second capacitive circuit; second set of terminals of the second capacitive circuit is connected with first set of terminals of the first switch circuit; and second set of terminals of the first switch circuit is connected to ground.

Abstract: A method for pilot signal based self-interference cancellation tuning includes detecting a tuning trigger and in response to the tuning trigger, generating a pilot transmit signal according to the trigger data; and transmitting, at the transmitter, the pilot transmit signal; receiving, at the receiver, a pilot receive signal; cancelling, at the self-interference canceller, a portion of self-interference in the receive pilot signal, resulting in a composite pilot signal; analyzing the composite pilot signal; and tuning a configuration parameter of the self-interference canceller, based on analysis of the composite pilot signal, resulting in reduced self-interference in the composite pilot signal.

Abstract: A low power long range transceiver is presented. The transceiver includes: an antenna configured to receive an RF signal; an analog front-end circuit configured to receive the RF signal from the antenna and pre-condition the RF signal by at least one of amplify the RF signal, shift frequency of the RF signal and filter the RF signal; and a demodulator configured to receive the preconditioned signal from the front-end circuit and an assertion trigger signal signifying an end of a predefined time period, where the demodulator, in response to the assertion trigger signal, outputs a data value for a given data bit in the RF signal. A controller is also configured to receive the assertion trigger signal and, in response to the assertion trigger signal, disables at least one component of the transceiver, thereby reducing power consumption.

Abstract: A device may determine a first signal quality value associated with a wireless signal received by a first antenna of the device, may determine a second signal quality value associated with a wireless signal received by a second antenna of the device, and may determine a combined signal quality value based on the first signal quality value and the second signal quality value. The device may apply an offset value to the first signal quality value to form a modified signal quality value, may compare the combined signal quality value and the modified signal quality value, and may selectively report the modified signal quality value or the combined signal quality value based on comparing the combined signal quality value and the modified signal quality value.

Abstract: A wireless communication device 1 carries out wireless communications using different wireless communication schemes through antennas independent of each other. When it decides that a party on the other end is a wireless communication device using a single antenna system, it switches to a simultaneous operation that carries out wireless LAN and Bluetooth wireless communication in parallel, and when it does not decide that the party on the other end is a wireless communication device using a single antenna system, it switches to a time-division operation that carries out the wireless LAN and Bluetooth wireless communication in time division.

Abstract: This disclosure provides systems, methods and apparatus for receiving power wirelessly. In one aspect, a receiver comprises an antenna that receives power wirelessly. The receiver further comprises a power circuit that operates according to a first frequency. The receiver further comprises a communication circuit that operates according to a second frequency. The receiver further comprises a circuit coupled between the antenna and the power circuit and the antenna and the communication circuit. The circuit comprises a first resonant network and a second resonant network. The circuit comprises a first path between the antenna and the power circuit via the first resonant network and a second path between the antenna and the communication circuit via the second resonant network. The first path has a higher impedance than the second path at the second frequency and has a lower impedance than the second path at the first frequency.

Abstract: An uplink antenna selection device and method are provided. The device comprises: at least two antennas; at least one antenna feed connected to each antenna, each antenna configured to transmit data on a respective given transmission band paired with a respective associated receive band; and, a processor, in communication with the at least one antenna feed. The processor is configured to: for each of the antennas, determine a respective quality-of-signal (QOS) parameter of at least one respective receive band adjacent to the respective given transmission band, the at least one respective receive band different from the respective associated receive band paired with the respective given transmission band; and control the at least one antenna feed to select one of the antennas for transmitting data on the respective given transmission band based on the respective QOS parameter of the at least one respective receive band for each of the antennas.

Abstract: Impedance mismatching by a matching circuit provided on a signal line which connects a first common terminal and a second common terminal is eliminated so as to significantly reduce insertion loss of a switch module. Therefore, it is possible to provide a switch module which has a simple configuration without the need for connection of a matching circuit to antenna terminals to which antennas are respectively connected, and is able to selectively connect any one of the antennas and any one of communication systems.

Abstract: A voltage generator including an oscillator having an output, a charge pump having an input and an output, the input of the charge pump being coupled to the output of the oscillator, a smoothing capacitor, a resistor having an input end and an output end, wherein the input end is coupled to the charge pump and the output end is coupled to the smoothing capacitor, and a shorting element connected in parallel with the resistor and which, when turned on, causes the resistor to be at least partially bypassed, wherein the voltage generator is configured to supply voltage to a radio frequency (RF) switch via the smoothing capacitor, and a frequency of the oscillator is controlled to be faster during a switching period of the RF switch.

Abstract: An RF front end circuit has a common impedance matching network connected to an output terminal, a first power amplifier arranged to drive power to the output terminal through the common impedance matching network, a second power amplifier adapted to drive power to the output terminal through the common impedance matching network, a second impedance matching network, and a reference terminal at a reference voltage. The second impedance matching network has at least a first connection path to the reference terminal, a second connection path to the second power amplifier and a third connection path to the common impedance matching network. The second impedance matching network also includes a first impedance switch configured to open the first connection path responsive to the second power amplifier being put into an OFF state.

Abstract: Transmit/receive switches and methods for radio control include connecting a first reactive impedance in parallel with a power amplifier on a transmit path during reception to neutralize a reactive impedance of the power amplifier and to prevent received signals from entering the transmit path. The first reactive impedance is disconnected during transmission.

Abstract: Provided is data signal transmitting method and data signal receiving method in a wireless communication system. A method of transmitting and receiving data signal in a wireless communication system by changing a transmission speed and a payload size included in the data signal according to an operation environment is disclosed.

Abstract: Disclosed are systems, circuits and methods related to low-loss bypass of a radio-frequency (RF) filter or diplexer. In some embodiments, a switching network circuitry can include a first switch that has an input pole configured to receive a radio-frequency (RF) signal, a pass-through throw configured to be connectable to the input pole to allow routing of the RF signal to an RF component, and at least one dedicated bypass throw configured to be connectable to the input pole and at least one bypass conduction path. The switching network circuitry can further include a second switch that has a pole and a throw, and is connectable between an output of the RF component and the bypass conduction path. Use of the dedicated bypass throw(s) in the first switch allows implementation of low-loss bypass of the filter or diplexer.

Abstract: Embodiments of the present invention provide a radio frequency transmit-receive apparatus, a terminal, and a method. The radio frequency transmit-receive apparatus according to the present invention includes: a first antenna unit, a duplexer, a radio frequency unit, and a signal selecting unit. The embodiments of the present invention can solve a problem of inflexible uplink and downlink resource configuration in a radio frequency transmit-receive apparatus in the prior art.

Abstract: An antenna tuning circuit for setting an antenna resonant mode of an antenna structure includes a switch arranged to selectively couple a first interconnection node to a second interconnection node, wherein the first interconnection node is coupled to a first port of the antenna structure, and the second interconnection node is coupled to a second port of the antenna structure. An antenna tuning method for setting an antenna resonant mode of an antenna structure includes generating a first control signal and selectively coupling a first interconnection node to a second interconnection node in response to the first control signal, wherein the first interconnection node is coupled to a first port of the antenna structure, and the second interconnection node is coupled to a second port of the antenna structure.

Abstract: An antenna and RF front-end arrangement include at least one LTE or WCDMA Tx&Rx antenna, one MIMO Rx or diversity antenna adapted for low band LTE or WCDMA and one MIMO Rx or diversity antenna adapted for high band LTE or WCDMA. At least one of the MIMO Rx or diversity antennas is adapted for transmitting and receiving WLAN and/or BlueTooth signals. Therefore, a dedicated WLAN antenna is not required and the number of antennas can be reduced.

Abstract: A radio frequency antenna switch is provided that includes an antenna port, a radio frequency signal port, and at least one branch connected to the antenna port or the radio frequency signal port, where each branch includes multiple transistors which are connected in a stack manner; channel width to length ratios of a preset number of transistors in the multiple transistors progressively decrease in a direction away from the antenna port, where the preset number is less than or equal to the total number of the multiple transistors. With the radio frequency antenna switch, capacitances of the preset number of transistors close to the antenna port increase, and distributed voltages that these transistors close to an antenna end in an off state need to bear are reduced.

Abstract: Diversity receiver front end system with switching network. A receiving system can include a plurality of amplifiers, each one of the plurality of amplifiers disposed along a corresponding one of a plurality of paths between an input of the receiving system and an output of the receiving system and configured to amplify a signal received at the amplifier. The receiving system can further include a switching network including one or more single-pole/single-throw switches, each one of the switches coupling two of the plurality of paths. The receiving system can further include a controller configured to receive a band select signal and, based on the band select signal, enable one of the plurality of amplifiers and control the switching network.

Abstract: A switch module includes a plurality of mounting electrodes for external connection provided on a peripheral portion of one main surface of a wiring substrate. The plurality of mounting electrodes includes a common electrode, a plurality of RF signal electrodes, a control electrode, and a power supply electrode. At least one of the power supply electrode and the control electrode is arranged between the RF signal electrodes.

Abstract: A mobile terminal and a method for reducing a specific absorption rate are disclosed. The mobile terminal includes: a control unit connected to an input unit, a memory and a switch, an antenna group containing multiple antennas, and the switch connected to each antenna and the radio-frequency circuit; wherein the input unit is configured to: detect a location of the mobile terminal relative to a user, and notify the control unit of the location; the memory is configured to: store location-specific absorption rate corresponding information of each antenna; and the control unit is configured to: according to the location, search the location-specific absorption rate corresponding information for a specific absorption rate of each antenna at the location, select an antenna according to the specific absorption rate of each antenna at the location, and control the switch to connect the selected antenna with the radio-frequency circuit.

Abstract: A radio frequency (RF) transmit-receive switch has an antenna port, first and second transmit differential ports and first and second receive differential ports. Transmit transistor switches are connected to the transmit differential ports. Primary and secondary windings of a transmit coupled inductor transformer are connected to the transmit transistor switches. Receive transistor switches are connected to the receive differential ports. Primary and secondary windings of a receive coupled inductor transformer are connected to the receive transistor switches. A first balun inductive winding is connected to the antenna port, and a second balun inductive winding is connected to the transistor switches.

Abstract: A multi-mode access point supports different radio access technologies (e.g., Wi-Fi and cellular) for serving multi-mode access terminals. To provide improved service for such an access terminal, the access point may redirect the access terminal from a first type of radio access technology to a second type of radio access technology under certain circumstances. A decision to invoke such a redirection may be based on, for example, at least one of: traffic conditions on the first type of radio access technology, traffic conditions on the second type of radio access technology, and whether a backhaul for the access point is currently a bottleneck for access point communication.

Abstract: A radio frequency (RF) switching module and a control method of the RF switching module are described. The RF switching module has 2 switches, and the control method includes starting to turn off a first switch of the RF switching module, starting to turn on a second switch of the RF switching module after the first switch is turned off for a first predetermined time, wherein starting to turn off the first switch and starting to turn on the second switch is finished during a transition period from a first mode to a second mode.

Abstract: A radio-frequency switch may include: a common port; a first signal transfer unit; and a second signal transfer unit, wherein the first signal transfer unit includes a first switch unit that has a plurality of switch circuit units, each of the plurality of switch circuit units having switches connected to each other with one forward-biased and another reverse-biased and being connected to a control terminal of respective switches in the first signal transfer part, and the second signal transfer unit includes a second switch unit that has a plurality of switch circuit units, each of the plurality of switch circuit units having switches connected to each other with one forward-biased and another reverse-biased and being connected to a control terminal of respective switches in the second signal transfer part.

Abstract: Shared filters may be used for both transmit and receive paths. In an exemplary design, an apparatus (e.g., a wireless device, an integrated circuit, or a circuit module) may include a filter and a switch. The filter operates as a transmit (TX) filter for a first band and as a receive (RX) filter for a second band. The filter may receive and filter an output radio frequency (RF) signal when operating as the TX filter and may receive and filter a received RF signal when operating as the RX filter. The switch is coupled to the filter and receives and passes the output RF signal to the filter or an input RF signal from the filter. The apparatus may further include a second filter operable as a TX filter for multiple bands and/or a third filter operable as an RX filter for multiple bands.

Abstract: A variable attenuator can be used with high-voltage radio-frequency signals. The attenuator can provide wide dynamic range with little loss at the lowest attenuation level. The attenuator may be implemented in digital integrated circuit processes and occupies small integrated circuit area. Additionally, the use of circuit elements external to the SoC may be reduced. The attenuator uses multiple attenuator cells connected in parallel to an RF input and RF output. The attenuator cells use capacitive dividers with pair of capacitors laid out in the same integrated circuit area. The capacitors are also laid out so that the RF input shields the RF output from ground to avoid parasitic capacitance on the RF output.