Patent ID: 8040922

Claim:
An apparatus of frame synchronization for a broad band wireless communication system, which can be used in combination with an m (m is a positive integer) Rx branch receiver, comprising: m number of time variant phase rotation compensators for receiving signal samples r 1 (n) to r m (n) (n is a positive integer indicating a running index of the signal samples), eliminating time variant phase rotations carried by the signal samples r 1 (n) to r m (n) due to Carrier Frequency Offset (CFO), and outputting signal samples D 1 (n) to D m (n) without the time variant phase rotations; a delay correlator for calculating delayed correlations by correlating the signal samples D 1 (n) to D m (n) with signal samples D 1 (n−N frame ) to D m (n−N frame ) (N frame is a number of the signal samples over one frame duration) delaying one frame; a local power calculator for calculating average power of a plurality of symbols centered on a corresponding delayed correlation; a normalizer for normalizing delayed correlations output from the delay correlator with the delayed correlations output related local average power output from the local power calculator; and a maximum value detector for detecting a maximum value from the normalized delayed correlations over the one frame duration.