Joint time delay and DOA estimation using 2-D matrix pencil algorithms and IEEE 802.11ac

The IEEE 802.11ac is an emerging WLAN standard for the 5 GHz band in which multiple input multiple output (MIMO) and wider channel bandwidths are enhanced compared to 802.11n. In this paper, we present the problem of estimating the propagation time delay, and the relative direction of arrival (DOA) associated with signals in a multipath communication channel for wireless indoor positioning. The recent subspace based algorithms, represented by two-dimensional matrix pencil (2-D MP) algorithms, are applied in a new way to estimate these parameters simultaneously from an estimated space channel frequency response (S-CFR). The performance of using multiple antennas and wideband orthogonal multicarrier signals are presented. Non line of sight (NLOS) experimental results show that accuracy in the range of a few hundreds of picoseconds, and a fraction of one degree could be achieved.