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In this paper, we investigated capacity maximization problem for Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing systems with imperfect channel state information (CSI). To the best of our knowledge, the considered problem is still an open problem. However, the transceiver designs for MIMO OFDM systems have been extensively studied. It seems nobody gives closed-form solutions...
In this paper, we consider the vertical beamforming in the downlink of a three dimensional (3D) massive multiple-input multiple-output (MIMO) system. Two beams are partitioned through dynamic vertical beamforming with two specific downtilts. Taking these users' specific downtilts into consideration, the objective of this scheme is to maximize cell spectral efficiency by adjusting the powers and downtilts...
Small cell networks have been recognized as a promising technology to realize high spectrum and energy efficiency communications in future wireless networks. However, the capacity of small cell networks is limited by the interference among the links communicating simultaneously. Efficient resource allocation and effective interference management is definitely imperative for small cells. In this paper,...
As with the development of satellite communication, high speed downlink transmission is an important factor communication systems in the near future. In considering of this demand, we propose an Orthogonal Frequency Division Multiplexing (OFDM) based transmission strategy for mobile satellite communication. Based on conventional territory wireless communication technology, we explore OFDM frame structure...
In this paper, we consider the energy-efficient power allocation in the downlink of a large-scale multiple-input multiple-output (MIMO) system under both quality of service (QoS) constraints and maximum transmit power constraints. With these two constraints satisfied, the resource allocation strategies are proposed, which aim to maximize the energy-efficiency defined as the successfully delivered...
We consider the downlink of a multi-cell network where neighboring base stations with large scale antennas share the spectrum and collaborate with each other to improve the overall network performance. This paper utilizes the zero-forcing (ZF) transmit beamformer, which has been proven as the simplest and optimal form for high SNR in large scale antennas system. The objective of the coordination is...
In this paper, we study the optimal pilot design problem and CSI feedback method in a massive MIMO system. We get the asymptotically optimal solution for pilot design based on minimizing the Mean Square Error (MSE) of channel estimation with both the Sum Power Constraint (SPC) and the Per Antenna Power constraint (PAPC) utilizing a t-norm approximation method. To further improve the transmission efficiency...
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