In many cases where direction finding is of interest, the signals impinging on an antenna array are known to be phase modulated, hence to have a constant modulus (CM). This is a strong property, by itself already sufficient for source separation, and can be used to construct improved direction finding algorithms. We first present the relevant Cramer-Rao bounds for arbitrary array configurations, and arbitrary number of signals and then specialize to uniform linear arrays with a single source. We then propose a simple suboptimal direction estimation algorithm, in which the signals are separated using the CM property only. Compared to the ESPRIT algorithm and to the Cramer-Rao bound for arbitrary signals, the algorithm shows good results.
|Number of pages
|Published - 1998
|Proceedings of the 1998 9th IEEE SP Workshop on Statistical Signal and Array Processing - Portland, OR, USA
Duration: 14 Sep 1998 → 16 Sep 1998
|Proceedings of the 1998 9th IEEE SP Workshop on Statistical Signal and Array Processing
|Portland, OR, USA
|14/09/98 → 16/09/98