Patent ID: 8094596

Claim:
A wireless personal area network Zigbee receiver receiving a signal packet including a plurality of functional units having a plurality of symbols, the wireless personal area network Zigbee receiver comprising: a preamble detection unit for, if an extension number is predetermined, correlating a preamble reference symbol with each of the symbols of the plurality of functional units of the signal packet, the plurality of functional units each being repeated as many as the predetermined extension number, continuously and repeatedly as many as the predetermined extension number to obtain and accumulate correlation values, detecting a preamble by using a cumulative correlation value obtained by accumulating the correlation values, and generating a preamble synchronization signal; a start of frame delimiter (SFD) synchronization unit for, if the extension number is predetermined, comparing, when the preamble synchronization signal is input, each symbol of SFD unit included in the signal packet with a predetermined SFD reference symbol continuously and repeatedly as many as the predetermined extension number, and generating an SFD synchronization signal when each of the symbols of the SFD unit is equal to the predetermined SFD reference symbol as many as the predetermined extension number; and a symbol detection unit for, if the extension number is predetermined, correlating, when the SFD synchronization signal is input from the SFD synchronization unit, symbols of data unit following the SFD unit of the signal packet with each of a plurality of reference symbols continuously and repeatedly as many as the predetermined extension number to obtain correlation values, accumulating the correlation values according to each of the reference symbols to obtain cumulative correlation values, and detecting a symbol having a largest cumulative correlation value, wherein the signal packet further includes the data unit having the symbols.