Abstract:

Based on uniform linear array, a blind estimating algorithm for spatial signature of uplink signals was presented. Using the fourth order cumulant of array output, a spatial-signature-matrix was constructed with the algorithm. It was proved that the spatial signature of each user can be obtained via decomposition of the spatial-signature-matrix. The algorithm is not dependent upon the modulation type of signal, and can be employed to additive arbitrary Gaussian noise. Applying it to estimate spatial signature of multi-user with coherent multi-path, the standard estimation deviations at different snapshots and signal-to-noise-ratio (SNR) were studied. The results confirm the availability and robustness of the algorithm.

Key words: smart antennas, spatial signature, high order cumulant, uniform linear array