Abstract: By investigating narrow-band interference suppression based on eigenanalysis in direct sequence spread spectrum (DSSS) communication systems, this paper simplifies the weight vector of eigencanceller. An improved algorithm, orthonormal robust recursive least square (ORRLS) algorithm is proposed to realize the eigencanceller. ORRLS algorithm can guarantee orthonormality of the weight matrix in iteration. Moreover, it can track the rank of interference subspace. Theoretic analysis and simulation indicate that the ORRLS algorithm can converge robustly when the interferences are very strong. It is suitable to reject narrow-band interferences in DSSS communication systems.

Key words: DSSS, narrow-band interference suppression, eigencanceller, subspace tracking algorithm, orthonormal robust recursive least square algorithm