Statistical techniques for blind detection & discrimination of m-sequence codes in DS/SS systems

Advances in modern DSP techniques provide a means for intercepting smart covert signal emitters by taking account of the structural properties of their waveform and/or spectra. Previous research has shown that higher-order statistical processing can detect and characterise direct-sequence spread-spectrum signals. Triple correlation analysis is able to detect m-sequence chip codes and also estimate the associated generator polynomials. The process works with full code frames and partial coded windows in noisy data modulated channels. The research reported concentrates on an investigation into various statistical methods for discriminating multiple DS/SS code sequences and also search techniques for blind detection of m-sequences where none of the code parameters is known to the intercept receiver in advance.