  With the rising demand for indoor localization, high precision
technique-based fingerprints became increasingly important nowadays. The newest
advanced localization system makes effort to improve localization accuracy in
the time or frequency domain, for example, the UWB localization technique can
achieve centimeter-level accuracy but have a high cost. Therefore, we present a
spatial domain extension-based scheme with low cost and verify the
effectiveness of antennas extension in localization accuracy. In this paper, we
achieve sub-meter level localization accuracy using a single AP by extending
three radio links of the modified laptops to more antennas. Moreover, the
experimental results show that the localization performance is superior as the
number of antennas increases with the help of spatial domain extension and
angular domain assisted.
