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In Orthogonal Frequency Division Multiplexing (OFDM) systems, the high-speed movement between the transmitter and receiver would cause large Doppler shifts, which will degrade the channel estimation severely due to the channel power dispersion. Moreover, the channel structure may vary fast such that the channel structure-based estimation methods cannot work properly. Therefore, one key challenge is...
In the future 5G, the fast-growing requirements of massive connectivity, higher data-rate transmissions and multiple services should be matched with new multiple access technology. Non-orthogonal multiple access, nowadays, is considered as an effective method to solve those problems. Some non-orthogonal multiple access technologies, e.g. low density signature (LDS) and sparse code multiple access...
The tremendous performance of large-scale multiple input multiple output (LS-MIMO) systems can be achieved by applying linear beamforming schemes, such as maximum ratio transmission and zero forcing, in time-division duplex mode. However, it is prohibitive to acquire the instantaneous channel state information (CSI) at the transmitter in frequency-division duplex (FDD) systems. Thanks to the compact...
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