A spectrally efficient algorithm for massive MIMO for mitigating pilot contamination

A problem that arises with pilot assignment in multicellular massive multiple-input-multiple-output (MIMO) systems is due to inter-cell interference, also known as pilot contamination. This paper focuses on minimizing the inter-cell interference that results from spatial correlation based on signal arrival parameters, assuming the use of a cylindrical antenna array. The signal parameters are used to estimate user location. The paper then develops an algorithm for allocating the pilot sequences to decrease the inter-cell interference and enhance the spectral efficiency.