| 摘要 |
A pseudonise code (PN) acquisition scheme employs all elements of a smart antenna array (102) and an adaptive threshold. The basic structure is the combination of a PN correlation searcher (105), an adaptive beam former (107) and an adaptive threshold setting circuit (108). During each observation interval, the adaptive beam former adaptively up-dates the weight vector for the smart antenna elements using the accumulated received signal despread with a trial PN code phase error. A spatially correlated signal is then formed by weighting an accumulated value of the signal received by each antenna in the array over the observation period with the corresponding final weight of smart antenna weight vector as calculated by the adaptive beamformer, and finally compared to the adaptive threshold to determine whether PN code acquisition has occurred. |
