论文部分内容阅读
针对国标2.45GHz射频识别空中接口协议,提出了一种易于工程实现的OQPSK/DBPSK调制解调系统。该解调系统检测相位差,对扩频序列进行非相干差分解调,且对载波频偏不敏感,不需要载波环路,并行计算量小。仿真了在加性高斯白噪声下的比特误码率,当比特能量与噪声功率谱密度之比E_B/N_O不小于5dB时,两者的比特误码率均低于千分之一。
In view of the national standard 2.45GHz radio frequency identification air interface protocol, an OQPSK / DBPSK modulation and demodulation system that is easy to implement is proposed. The demodulation system detects the phase difference, performs non-coherent differential demodulation on the spreading sequence, and is insensitive to the carrier frequency offset, does not require a carrier loop, and has a small amount of parallel computation. The bit error rate under additive white Gaussian noise is simulated. When the ratio of bit energy to noise power spectral density E_B / N_O is not less than 5dB, the bit error rates of the two are less than one per thousand.