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\left\{ {wal\left( {w,\theta } \right)} \right\}_{w = 0}^{L - 1} \left\{ {\left\{ {ro{m_u}\left( {r,\theta } \right)} \right\}_{r = 0}^{L - 1}} \right\}_{u = 1}^8 - [9] Salh A., Audah L., Shah N. S. M., Hamzah S. A., Mitigating pilot contamination for channel estimation in multi-cell massive MIMO systems, ‘Wireless Personal Communications’, 2020, Iss. 112, pp. 1643–1658.
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