Location-based service has a great potential in the indoor environment, making it important to develop accurate indoor localization techniques. In this paper, we consider AOA based indoor localization, which can generally achieve higher accuracy of localization than other approaches. We propose to use cooperative APs with antenna arrays for accurate indoor localization. With the proposed Cooperative Antenna Arrays Technique (CA 2 T), we first estimate the arriving angles for all the multipath

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... mponents using the MUSIC algorithm, and then exploit the geometric relationship among the angles to identify the LOS angles. The user location can be computed with the LOS angles and the accurate, known distance between the two APs. The proposed scheme is validated with simulations and is shown to outperform an existing scheme with considerable gains.