Very high bit rate rfid receiver

A RFID receiver for receiving a signal comprising transmission frames, each frame consisting of PSK symbols and beginning with a sequence of a, a, a*, a*,a, a, . . . type pilot symbols, the signal being modulated at a carrier frequency f=1/T , the receiver comprising a quadrature digital demodulator (110) for providing, at a sampling frequency fe=4f, in-phase samples and quadrature samples to a symbol synchronization module (120), a PSK demodulator (130) for demodulating PSK symbols provided by the symbol synchronization module, said receiver comprising:

• a first demultiplexer receiving a sequence formed by the consecutive quadrature samples for providing four interleaved subsequences of these samples, each subsequence consisting of one sample out of four of said sequence of samples;
• a sign detector receiving the samples of one of these subsequences and providing a sign signal;
• a sign correlator for correlating the sign signal thus obtained with a signed sequence having a predetermined length;
• correlation means for correlating the different subsequences with said signed sequence respectively;
• a first decision module activated when the correlation result of the sign correlator exceeds a predetermined threshold, the decision module determining, when activated, the subsequence providing the highest correlation result and deducing a decimation point in time therefrom;
• at least one first and one second decimator receiving respectively, at the sampling frequency, the in-phase and quadrature samples of the quadrature digital demodulator, and decimating them at said decimation point in time for providing in-phase and quadrature components of the modulation symbols at the baud rate.