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Massive multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems are sensitive to in-phase and quadrature (IQ) imbalances, which destroys the reciprocity of time-division duplex (TDD) uplink/downlink channels with potentially large performance degradation. In this letter, we investigate the compensation of channel reciprocity for TDD massive MIMO-OFDM systems...
In the 3D massive MIMO system, both the transmitter encoding and the receiver signal detection require channel state information. The accuracy of channel state information will directly affect the overall performance of the system. Therefore, accurate channel estimation is the key to reliable communication in the 3D massive MIMO system. Due to the channel sparsity of 3D massive MIMO, existing works...
Massive multiple-input and multiple-output (MIMO) technique is regarded as one of the most promising technique in the fifth-generation (5G) wireless communication systems. However, accurate channel estimation technique poses a challenge for spatial correlated 3D MIMO systems. Based on the conventional general sparse channel model, sparse channel estimation method using compressive sampling matching...
As the increasing requirement of channel capacity for next-generation mobile broadband communication systems, three-dimensional multiple-input multiple-output (3D MIMO) systems have been attracting much attentions in recent years. Accurate channel estimation is inevitably one of the most essential tasks for designing the 3D MIMO systems. This paper first studies the sparsity of 3D MIMO channel and...
Considering the three dimensional (3D) channel with elevation effect, a two dimensional (2D) antenna array was employed in a generic ray-based 3D multi-input multi-output (MIMO) system. Through utilizing the channel spatial correlation between antennas at the transmitter side, we propose a cascaded MMSE channel estimation with low computational complexity. Numerical results show that the proposed...
In this paper, a channel estimation method based on the superimposed pilots with the first-order statistics is proposed for massive MIMO systems. In the proposed method, no time slots are cost on training. Hence, transmission rate of the system is higher than the traditional method. Further, a decoder is designed based on MMSE decoder. Finally, simulations show that the performance of the system with...
Future fifth generation (5G) mobile networks will greatly increase the date-rate of communication. Three-dimensional (3D) multiple input multiple output (MIMO) systems have drawn more and more attention as they meet the increasing date-rate demands in 5G mobile networks. However, in the practical system, the large overhead of the channel state information-reference signal (CSI-RS) would become a barrier...
For multicell MIMO interfering broadcast channels (IFBC), the zero-forcing-based approach can achieve the near optimal performance at high signal-noise-ratio (SNR) regime. However, the drawback of the zero-forcing-based approach is the poor performance in low SNR regime compared to the conditional match filter receive scheme. In order to address this problem, we propose an algorithm for minimizing...
Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) is considered as candidates for future 3G/B3G broadband wireless services. In this paper a novel signal detection scheme based on Quantum Genetic Algorithm (QGA) is proposed for MIMO-OFDM systems. Quantum Genetic Algorithm (QGA) is based on the concept and principles of quantum computing, such as quantum bit and...
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