Apparatus and method for detecting preambles according to IEEE 802.11A wireless LAN standard

摘要

A novel method and apparatus for short preamble detection within the framework of the 802.11a standard is described. The present invention can be easily implemented in both the radio part (preferred embodiment) and the baseband part (general case) of the receiver to provide short preamble detection. The inventive method and apparatus utilize either a notch comb filter to remove the rake of subcarriers composing the short preamble or a battery of bandpass filters to enhance them. A decision on the presence of the short preamble is made by comparing the magnitude associated to certain qualities of the input and output sequences to a preset threshold. The proposed innovation offers a significant advantage over conventional approaches in terms of gate count and power consumption.