Implementation of a OQPSK/DBPSK Modulator-Demodulator System for 2.45 GHz RFID
TIAN Cuicui;CHEN Gang;SHU Haixiang;Chongqing Southwest Integrated Circuit Design Co.,Ltd.;
An OQPSK/DBPSK modulation and demodulation system easy to implement project was presented for the national standard 2.45 GHz radio frequency identification(RFID)air interface protocol.The phase difference was detected and the spread spectrum sequences were demodulated by the non-coherent differential demodulation method in the demodulation system.The proposed algorithm was insensitive to carrier frequency offset,and the carrier loop and a large quantity of parallel computing weren't needed.The bit error rate(BER)under additive white Gaussian noise was simulated.When the ratio of bit energy to noise power spectral density(EB/NO)wasn't less than 5dB,both of the BER were less than one thousandth.
【CateGory Index】： TN915.05