ملخص: An effective technique in estimating the directions of arrival (DOAs) of incoming signals using three orthogonal sensors is proposed. The model of channel with multipath transmissions for code-division multiple access (CDMA) users whose signals are modulated with binary phase-shift keying (BPSK) is used. Utilizing the maximum-likelihood (ML) method, the channel impulse response vectors of three sensors can be estimated, then all of the corresponding propagation delays and amplitude weights of three sensors' channels can be obtained respectively. By comparing the propagation delays of three sensors' channels, we can identify the same signal replica, then the DOI of it can be estimated by the relation of the three corresponding attenuation weights. Calculating results show this method can reach fairly high accuracy, and it needs only three sensors while in other techniques the required number of sensors is greater than the number of estimated signals.

لغة: إنجليزية