DECODING METHOD OF LOW INTERMEDIATE FREQUENCY RECEIVING SYSTEM IN SHORT-RANGE WIRELESS NETWORK

摘要

A decoding method of a low intermediate frequency receiving system in a short-range wireless network is provided. The method includes: at first receiving the radio frequency signal emitted from the sending end of the short-range wireless network, thus obtaining the low-intermediate frequency (IF) receiving signal after down-frequency conversion, and then obtaining the baseband receiving signal after sampling; making conjugate correlation operation for the local spread frequency modulation complex sequence in a short-range wireless network and obtaining a set of weight-value sequence; making up-frequency conversion  to the low-IF for the first local sequence of the local spread frequency modulation complex sequence in a short-range wireless network and obtaining low-IF local spread frequency sequence; making conjugate multiply respectively for the corresponding points of the low-IF spread frequency sequences and the synchronization low-IF receiving signal sequence in the short-range wireless network and obtaining a correlation value sequence; making correlation operation for the correlation value sequence and the above each weight-value sequence and obtaining a set of correlation value corresponding to the weights value sequence; the binary denotation of the sequence location corresponding to the largest correlation value is the data bit received and demodulated.