Effect of Spread Spectrum Pilot on an SVD Based Adaptive Duplexer

The accurate detection of leakage signals is of vital importance for their cancellation in an adaptive duplexer. This paper presents a solution for detecting and correcting the leakage in the receive band from a local transmitter. It is shown that this method has minimal effect on the desired received signal while providing an accurate error measure for the correction technique. A one dimension search algorithm eliminates the error in 250 iterations, while a more complex singular value decomposition (SVD) method requires only 10 iterations. The disadvantage of the SVD is the need for secondary adjustment loops. The (W)CDMA simulation model uses a spread spectrum pilot