Patent ID: 9646299
Date: 2017-05-09
CPC Classifications: G06Q,H04B,H04W

Claim:
1. A payment reader for communicating with a contactless payment device via a wireless signal, the payment reader comprising: an antenna; a processing unit configured to generate a carrier signal; a transmit circuit configured to receive the carrier signal from the processing unit, generate a wireless carrier signal based on the carrier signal, and provide the wireless carrier signal to the antenna, wherein the antenna is configured to transmit the wireless carrier signal; a receive circuit configured to receive a modulated version of the wireless carrier signal from the antenna and provide a received signal representative of the modulated wireless carrier signal to the processing unit, wherein the processing unit is configured to determine received data from the contactless payment device based on the received signal; a measurement circuit configured to determine one or more characteristics of an inductively coupled signal, wherein the one or more characteristics comprise signal strength, phase, or frequency, wherein the inductively coupled signal is based on the transmitted wireless carrier signal, wherein the processing unit is configured to determine a measurement value associated with a distance to the contactless payment device based on the one or more characteristics, wherein the processing unit is configured to generate a modulated signal based on data to be transmitted, the carrier signal, and a modulation procedure, wherein the transmit circuit is configured to generate a wireless data signal based on the modulated signal and provide the wireless data signal to the antenna, wherein the antenna is configured to transmit the wireless data signal, and wherein the processing unit is configured to select between a delayed H-bridge modulation procedure or a notch modulation procedure as the modulation procedure based on the measurement value.