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• W2839005931 abstract "A wireless massive multiple-input multiple-output (MIMO) system entails a large number of base station antennas serving a much smaller number of users, with large gains in spectral efficiency and energy efficiency compared with the conventional MIMO technology. Until recently, it was believed that as the number of base station antennas tends to infinity, the performance of such systems is limited by directed inter-cellular interference caused by unavoidable re-use of training sequences (pilot contamination) by users in different cells. We devise a new concept of large-scale fading precoding (LSFP) that leads to the effective elimination of inter-cell interference. The main idea of LSFP is that base stations linearly combine messages aimed at users from different cells that re-use the same training sequence. Crucially, the combining coefficients depend only on the large-scale fading coefficients between the users and the base stations. These coefficients change slowly and their number does not depend on the number of base station antennas. Thus, the traffic between base stations stays constant even if the number of antennas tends to infinity. Furthermore, we derive a capacity lower bound for massive MIMO systems with LSFP and a finite number of base station antennas. In this regime, mitigation of all types of interference, not only the pilot contamination, is required. We consider optimal and suboptimal LSFP precodings that take into account all sources of interference. Our simulations results show that LSFP provides significant gain even for the case of moderate number of base station antennas." @default.
• W2839005931 created "2018-07-19" @default.
• W2839005931 creator A5014805999 @default.
• W2839005931 creator A5065243271 @default.
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• W2839005931 date "2018-09-01" @default.
• W2839005931 modified "2023-09-30" @default.
• W2839005931 title "Interference Reduction in Multi-Cell Massive MIMO Systems With Large-Scale Fading Precoding" @default.
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• W2839005931 doi "https://doi.org/10.1109/tit.2018.2853733" @default.
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