Reduction of pilot contamination in massive MIMO system

• Published in: 2017 IEEE Asia Pacific Microwave Conference (APMC) pp. 885 - 888
• Main Authors: Salh, A., Audah, L., Shah, N. S. M., Hamzah, S. A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-11-2017
• Subjects: massive MIMO; signal-to-interference-noise ratio; spectral efficiency
• DOI: 10.1109/APMC.2017.8251591

Massive MIMO has become an important fifth-generation wireless communication system because it improves transmitted spectral efficiency. In this paper, we obtain the maximal spectral efficiency by improving transmission performance in cell edges. This can be achieved by using pilot reuse factor from all available pilots in order to mitigate the pilot contamination and to suppress interference between adjacent cells. In addition, we investigate the impacts of pilot contamination on the received signal-to-interference-noise ratios of users and employing different pilot reuse. We propose a new method called cell-edge-aware maximum ratio transmission, zero forcing, and return zero forcing. These are the precoders that employ less spatial dimensions and able to suppress adjacent cells interference of the maximally vulnerable active user. We conclude that the large pilot reuse value between neighbouring cells increases the gain, avoids interference between adjacent cells, and gives the maximal spectral efficiency.