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Anatolij Zubow, Piotr Gawłowicz and Falko Dressler, "On Phase Offsets of 802.11ac Commodity WiFi," arXiv, eess.SP, 2005.03755, May 2020.


We analyze the phase offsets between RF chains of modern IEEE 802.11ac chips. We investigate both the 2.4 and 5GHz bands on a per OFDM subcarrier level. Results reveal that the phase offset between receive antennas is due to random phase rotations semi-time-invariant with up to four possible values. Moreover, it is frequency-dependent. We propose a simple algorithm, which allows us to correct the phase offset on the fly without any calibration. As proof-of-concept, we implemented Angle of Arrival (AoA) using MUSIC algorithm. To achieve higher accuracy we stitched the thirteen overlapping 20MHz channels available in 2.4GHz band together to effectively have a single 80MHz channel. Results show very good AoA precision although only two receive antennas were used.

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Anatolij Zubow
Piotr Gawłowicz
Falko Dressler

BibTeX reference

    author = {Zubow, Anatolij and Gawłowicz, Piotr and Dressler, Falko},
    doi = {10.48550/arXiv.2005.03755},
    title = {{On Phase Offsets of 802.11ac Commodity WiFi}},
    institution = {arXiv},
    month = {5},
    number = {2005.03755},
    type = {eess.SP},
    year = {2020},

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