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In this paper, a reconfigurable graphene transmission array is proposed for the generation of vortex radio waves at THz. By perforating the substrate with holes of various diameters, different values of effective permittivity are obtained. The transmission coefficient can be adjusted by changing the chemical potential of graphene. With the excitation of planar wave, the phase-compensation of corresponding...
This paper considers the uplink of a single-cell large-scale multiuser multiple-input multiple-output (MU-MIMO) system. The transmitted data is detected by linear receivers at the base station (BS), that is, maximum ratio combining (MRC), zero-forcing (ZF) and minimum mean square error (MMSE). New non-asymptotic outage expressions that are valid for any number of BS antennas are derived. It is shown...
A graphene patch reflectarray is proposed for the first time to generate THz wave with orbital angular momentum (OAM). It is shown that by properly assigning the graphene patches with specific reflection coefficients, an OAM-carrying beam can be generated. The graphene reflectarray, which consists of 8 regions and each region contains about 170 patches with uniform chemical potential and size, has...
In our previous work, a hybrid transform coding (HTC) scheme was proposed for the compression and feedback of channel state information (CSI) in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In this paper, we investigate the performance of HTC in both the interfering broadcast channel (IBC) model and cellular network model. In IBC, the achievable...
To successfully deploy multi femtocells in public places, the interference between femtocells must be mitigated. However, some unique features of femtocells present a challenge in interference mitigation, such as complex indoor wireless environment and short distance between femtocells. In this paper, a novel low cost cognitive enabled multi-element antenna solution is proposed to reduce the intra-tier...
In the paper, two SPIHT-Coded image transmission modes are proposed by taking advantage of the multiple-input multiple-output (MIMO) diversity to perform unequal error protection (UEP). Firstly, the SPIHT-Coded Image information stream is divided into different quality substreams according to their different importance. Then, for serial transmission mode, the most important substream is transmitted...
This paper addresses the linear processing issues for two way non-regenerative MIMO relay systems with multiple antennas at each node. Based on theoretical derivation, we first propose an optimal joint iterative linear processing scheme for the relay node and receiving source nodes, aiming to minimize the total mean squared error (MSE). The convergence of this iterative algorithm is proved in terms...
Generalized distributed antenna is one of the most promising architectures likely to be used in next generation mobile communication systems. In this paper, based on the architecture, multi-user co-channel interference in Doppler spread estimation is analyzed and several useful conclusions are obtained. Moreover, in order to combat this interference, a novel ACF-based multi-user joint Doppler spread...
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