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Non-orthogonal multiple access (NOMA) is a candidate technology for the 5th generation cellular networks to reduce the big gap between network capacity and fast growing traffic. It applies superposition coding in transmitters and successive interference cancellation at the receivers to cancel intra-cell interference. The same frequency resource can be allocated simultaneously to multiple intra-cell...
In this paper, we propose a practical interference alignment technique based on an opportunistic user selection in a three-user 2 ×2 MIMO interference channel where no information is allowed to be shared among transmitters. In the proposed scheme, the user whose interference signals from other transmitters are most aligned with each other is selected at each transmitter. We also investigate optimal...
To minimize the overall transmit power while maintaining a constant data rate and target BER, a downlink adaptive resource allocation algorithm with G type channel estimated error at the base station is proposed for multiuser space-time block coding and beam forming (STBC-BF) MIMO-OFDM system in correlated channels. The algorithm allocates the subcarriers with the shared manner. A null steering processing...
The sum capacity of a Gaussian broadcast MIMO channel can be achieved with dirty paper coding (DPC). Deploying DPC in real-time systems is, however, impractical. Block diagonalization (BD) is an alternative precoding technique for downlink multiuser MIMO systems, which can eliminate interuser interference at each receiver, at the expense of suboptimal sum capacity vs. DPC. In this paper, we study...
In ultra-wide bandwidth (UWB) communication systems, dense multipath and severe multiuser interference (MUI) make the receiver high in hardware complexity and power consumption. It is desirable to shift the computation-demanding work to users with plentiful power and computational resources. We propose two prefiltering schemes which combat the MUI and multipath effects in the transmitter, so that...
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