This paper presents an interference cancellation and multipath mitigation algorithm for use in Global Positioning System (GPS) with an array antenna. It is shown that interference signals and multipath signals are effectively suppressed using a serial subspace projection method without any knowledge of the incoming directional information. After the subspace projections, a beamformer is used to maximize the SNR of the received signal. The enhancement in the performance is presented in terms of the cross correlation value and beam patterns.

In this paper, two methods for improving the performance of DSBC (Dynamic bit allocation Sub-Band Coder) are proposed. One is to modify the bit allocation algorithm since conventional dynamic bit allocation algorithm is computationally heavy, while the other one is to weight the subband to reduce hissing noise. Instead of inserting the Gaussian noise in regeneration of empty band, the subband weighting method is to utilize shaped subband signal as empty band signal. The simulation result shows that computational complexity is reduced about 10%, and perceptual hissing noise is suppressed noticeably.