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In uplink massive multiple-input multiple-output (MIMO) systems, the conventional minimum mean square error-interference rejection combining (MMSE-IRC) signal detection algorithm needs to compute the inverse of the interference and noise covariance matrix, which incurs high computational complexity, especially when the number of antennas is large. A low-complexity MMSE-IRC signal detection algorithm...
Channel state information (CSI) at the base station (BS) is crucial to fully exploit the advantages of massive multiple-input multiple-output (MIMO) systems. In frequency division duplexing systems, CSI is obtained through downlink channel estimation and uplink CSI feedback. The conventional CSI acquisition scheme, which has been designed based on the beam selection principle, suffers from severe...
The multiple antenna technique is one of the most promising technologies to enhance system performance to reach the challenging requirements of IMT-Advanced technical requirement ITU-R M.2134[1]. Channel state information is essential to enable closed-loop multiple antenna techniques. Channel reciprocity is an efficient and economic way of providing network with channel state information. In this...
The MIMO technology is one of the most important technologies to enhance the system performance to reach the challenge of IMT-advanced technical requirement ITU-R M.2134. To keep more antenna number while decrease physical size, dual-polarized antenna array is a potential type for MIMO application in the future IMT-advanced system. In this paper, a modified polarization model is proposed for the MIMO...
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