Abstract: A device implementing a system for preventing duplicate wireless transactions includes a wireless communication controller that is configured to receive a signal for conducting a wireless transaction with a wireless transaction terminal. The wireless communication controller is further configured to determine whether a transaction type of the wireless transaction is associated with a signal strength threshold. The wireless communication controller is further configured to measure a signal strength associated with the wireless transaction upon determining that the transaction type of the wireless transaction is associated with the signal strength threshold. The wireless communication controller is further configured to prevent the wireless transaction from completing when the transaction type of the wireless transaction is associated with the signal strength threshold and the measured signal strength fails to satisfy the signal strength threshold, otherwise allow the wireless transaction to complete.

Abstract: A device and method for mitigating the effects of carrier leakage and improving a near-field communications (“NFC”). The device includes a transmitter configured to generate an output signal including an output carrier signal, a receiver configured to demodulate a received signal including a received carrier signal, and an antenna configured to transmit the output signal and receive the received signal. The device further includes circuitry configured to electrically connect the transmitter via a transmit path to the antenna and the receiver via a receive path to the antenna, wherein the output carrier signal leaks into the receive path as a leakage signal, the circuitry comprising a phase shifter connecting the transmit path to the receive path and configured to phase shift the leakage signal with respect to the received carrier signal to reduce a voltage of a combined leakage signal and received signal received by the receiver.

Abstract: In order to improve communication with another electronic device, during an advertising mode an electronic device (such as a smartphone) may transmit a packet with advertising information using a default transmit power level. Then, based on feedback about a performance metric associated with the communication from the other electronic device, the electronic device may selectively increase the transmit power level for a subsequent packet. Because this selective increase in the transmit power level may increase the overall power consumption, the change in the transmit power level also may depend on one or more factors, such as a battery power level of the electronic device. However, the selective increase in the transmit power level may, in some instances, decrease the overall power consumption by reducing or eliminating retries.

Abstract: A device implementing a system for preventing duplicate wireless transactions includes a wireless communication controller that is configured to receive a signal for conducting a wireless transaction with a wireless transaction terminal. The wireless communication controller is further configured to determine whether a transaction type of the wireless transaction is associated with a signal strength threshold. The wireless communication controller is further configured to measure a signal strength associated with the wireless transaction upon determining that the transaction type of the wireless transaction is associated with the signal strength threshold. The wireless communication controller is further configured to prevent the wireless transaction from completing when the transaction type of the wireless transaction is associated with the signal strength threshold and the measured signal strength fails to satisfy the signal strength threshold, otherwise allow the wireless transaction to complete.

Abstract: Methods for operating a portable electronic device to conduct mobile payment transactions are provided. The electronic device may include near field communications circuitry having a transmitter, a receiver, and a field detector for detecting a field from a merchant terminal. The receiver is typically idle. The receiver may be activated when the field detector detects that the electronic device is within the field of the merchant terminal. The transmitter may then be used to perform link establishment and data transfer. If the payment transaction fails for any reason, one or more hardware settings on the electronic device may be adjusted to help increase the chance of a successful transaction in a subsequent payment attempt. Another transaction may be attempted when the user moves the device out of the field and back into the field or may be performed automatically as long as the device is still within the field.

Abstract: In order to improve communication with another electronic device, during an advertising mode an electronic device (such as a smartphone) may transmit a packet with advertising information using a default transmit power level. Then, based on feedback about a performance metric associated with the communication from the other electronic device, the electronic device may selectively increase the transmit power level for a subsequent packet. Because this selective increase in the transmit power level may increase the overall power consumption, the change in the transmit power level also may depend on one or more factors, such as a battery power level of the electronic device. However, the selective increase in the transmit power level may, in some instances, decrease the overall power consumption by reducing or eliminating retries.

Abstract: Methods for operating a portable electronic device to conduct mobile payment transactions are provided. The electronic device may include near field communications circuitry having a transmitter, a receiver, and a field detector for detecting a field from a merchant terminal. The receiver is typically idle. The receiver may be activated when the field detector detects that the electronic device is within the field of the merchant terminal. The transmitter may then be used to perform link establishment and data transfer. If the payment transaction fails for any reason, one or more hardware settings on the electronic device may be adjusted to help increase the chance of a successful transaction in a subsequent payment attempt. Another transaction may be attempted when the user moves the device out of the field and back into the field or may be performed automatically as long as the device is still within the field.