Cognitive Radios is emerging as a promising wireless paradigm, which will integrate benefits of software defined radio with a complete aware communication behavior. By detecting environments in real time and extracting interference characteristic in frequency spectrum, it can use flexible spectrum assign strategy for adaptive communications. To reach this goal many issues remain still open, such as powerful algorithms for sensing the external environment. In this paper, a novel algorithm based on twice spectrum correlation is presented and computational complexity is analyzed. Then the realization scheme is suggested and applied in frequencyhopping communication systems. Computer simulations show that it can exactly provide spectrum occupation in real time for cognitive terminals.
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