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Lattice reduction (LR) aided multiple-input multiple-output (MIMO) detectors have been considered as an option to obtain near-maximum likelihood (ML) performance. We first give the analysis to show that large signal-to-noise ratio (SNR) corresponds to the short length of the dual basis vectors. Then, in order to further alleviate the complexity of LR aided MIMO detectors while maintaining acceptable...
In this paper, the optimal power allocation (OPA) problem for Chase combining (CC)-based cooperative hybrid automatic repeat request (HARQ) protocol over block Rayleigh fading channels is addressed. With the constraints of the targeted outage probability and the maximum number of transmission rounds, we aim at determining the optimal power sequences of the source and the relay to minimize the average...
Abstract-A new selective transmission mode in a three-node relay system is proposed when interference cancellation (IC) is not applicable on receivers. According to the effective Signal-to-Noise-Ratio (SNR) of each link, the source determines whether to transmit new information in the second slot while the relay node is forwarding the information received during the first slot. By the proposed monitoring...
This paper focuses on transmit precoding for multiuser MIMO downlink systems. In multiuser MIMO systems, multiuser interference (MUI) and noise are two well-known factors with respect to the system's performance. Block diagonalization (BD) method is proposed to completely eliminate MUI by placing the intended users in the nullspace of all the unintended users. But the BD method imposes a condition...
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