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Multiuser MIMO (MU-MIMO) improves the system channel capacity by employing the transmission between a base station (BS) and multiple user terminals (UTs). Block Diagonalization (BD) has been proposed as a practical algorithm in MU-MIMO broadcast channel. However, when the number of transmit antennas is equals to the total number of received antennas, the transmission rate by the BD algorithm is decreased...
A new primary receiver detection method in cognitive radio for OFDM system is proposed in this paper. In the proposed method, the OFDM signal is modulated by load modulation at the primary system. Due to the modulation, spurious components appear in guard band of the OFDM system. Then, the secondary receiver detects the direction of the primary receiver through estimating the direction of the spurious...
Recently, the challenges of the utilization of higher frequency bands for cellular systems have been attracting attention. In these high frequency bands, besides the higher propagation losses, the propagation channel tends to suffer more severe shadowing by pedestrians in the environments. In this paper, we carried out measurements in the 26GHz band in an indoor quasi-static environment for figuring...
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