Pulse position modulation (PPM) method in order to calibrate the decoder vis-a-vis the PPM signal, the system and the device

摘要

Pulse position modulation (PPM) the Radio Frequency identification which possesses the decoder circuit (RFID) the tag device. For example as for the above-mentioned pulse position modulation decoder circuit, the internal oscillator and the external PPM source of the above-mentioned RFID tag device (, the RFID tag reader) with relative frequency relationship between is calculated. The above-mentioned PPM decoder circuit outside describing is calibrated the PPM source (namely, the RFID tag reader) with, vis-a-vis the difference with the internal clocking oscillators of the above-mentioned RFID tag device. This calibration process is done with the measurement of 1 times between 1 calibration symbol periods. Selective figure Figure 2