| 摘要 |
The present invention relates to the field of wireless communication systems and in particular to an apparatus and a method for short preamble detection within the framework of the 802.11b standard. The present invention can be easily implemented in either the radio part (preferred embodiment) or the baseband part (general case) of a wireless LAN receiver to provide short preamble detection. The inventive method and apparatus utilize a couple of low-complexity cross-correlators respectively fed by an oversampled I and Q signal to detect the presence of a short preamble. A decision on the presence of the short preamble is made by comparing a figure of merit formed by adding the magnitude of the largest peaks respectively yielded by both cross-correlators to a preset threshold. The proposed innovation offers a significant advantage over conventional approaches in terms of gate count and power consumption.
|
