Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2014 Vol: 6 Issue: 6

DOA Estimation and Blind Separation of Coherent Signals


In this paper a new blind beamforming algorithm for separating and estimating coherent signals arriving at an antenna array was proposed. This algorithm was based on Toeplitz matrix reconstruction implemented through constructing the Hermitian Toeplitz matrix. Then signal sources’ direction-of-arrival(DOA) was established by spectral peak searching after using singular value decomposition of the matrix. In this way the direction vector of coherent sources used for beamforming was achieved. The new algorithm can effectively estimate the coherent signals’ direction-of-arrival and separate the independent signals from different directions without knowing a priori knowledge of the signals, and the correlation coefficient of isolated signal and the source signal is close to 1. It also has a higher output SINR under the low SNR. The simulations indicated that the proposed methods worked well in a variety of situations

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