Patent ID: 7746818

Claim:
A wireless communication receiver for receiving a packet selectively in form of a WLAN standard among N WLAN standards, N being an integer larger than 1, the packet comprising a preamble and a modulated data, the wireless communication receiver comprising: a circuit for identifying the WLAN standard of the packet, comprising: a shift register for receiving the preamble, said shift register comprising a common output unit for outputting a common preamble period stored in the shift register and N output units for outputting N different preamble periods stored in the shift register corresponding to N WLAN standards; a determinator comprising N first correlators and one second correlator, the N first correlators and the second correlator connected to the common output unit for retrieving the common preamble period, the N first correlators connected to the N output units respectively for retrieving the N different preamble periods respectively, wherein outputs of the N first correlators are each compared with an output of the second correlator respectively to output N first signals; and decision logic for deciding the WLAN standard of the packet according to the N first signals and outputting a second signal indicative of a decision result; and a demodulator for demodulating the modulated data according to the second signal.