Modulated lapped transform generalized sidelobe canceller

Continuing improvements in analog and digital technology has made elemental digital beamforming (DBF) for sensor arrays a reality. Weak signal reception enhancement can be achieved through the adaptive suppression of potentially time-varying interference in operational environments. Utilizing all the degrees of freedom (DoF´s) of an adaptive elemental DBF array with a large number of elements is often prohibitive in terms of computational complexity and speed of adaptation. Partially adaptive suboptimal architectures which reduce the DoF´s with minimal performance degradation are required. One such architecture based on the generalized sidelobe canceller (GSC) with a wavelet-based spatial blocking matrix utilizing minimal length M-band K-regular wavelets has been previously proposed. The work presented in Y. Chu and W. Fang (2003) improves upon the wavelet-based GSC in terms of cancellation performance and computational efficiency by using the modulated lapped transform (MLT) to implement the blocking matrix