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Many significant sources of error take place in the smart antenna system like mismatching between the supposed steering vectors and the real vectors, insufficient calibration of array antenna, etc. These errors correspond to adding spatially white noise to each element of the array antenna, therefore the performance of the smart antenna falls and the desired output signal is destroyed. This paper...
The 5G cellular networks has brought along with it a plethora of the connected devices which turned the scales from human-centric to device-centric communication leading to more issues in the spectrum reuse. In this context, this article tackles the resource allocation issue within D2D communications underlay uplink in 5G networks. We focus our study on maximizing the overall system throughput and...
In the cooperative spectrum sensing, it is not that the more cooperative sensing nodes are, the better the sensing performance is. How to select suitable sensing nodes to participate in fusion is a key problem in the cooperative spectrum sensing. This paper proposed a new cooperative spectrum sensing algorithm, in which the sensing nodes to participate in fusion is selected according to the reliability...
In cognitive radio (CR) systems, secondary transmitters (STs) should have etiquette that its transmission is not harmful to primary communication. Limiting transmitting power of ST is a usual way of being polite in a physical-layer point of view. In this paper, we assume that a primary user (PU) has a desire to keep its stable throughput though ST intervenes, which is a network-layer goal. And we...
This paper addresses the energy consumption minimization of a two-way amplify-and-forward (AF) relay network with imperfect statistical channel state information (CSI). First, we derive the expression of end-to-end signal-to-noise ratio (SNR) in dual-hop transmissions over independent identically distributed Rayleigh fading channels. Then, we formulate the energy optimization problem under data rate...
The increasing demand for reliable mobile services with faster communications speed requires high capital investment in the radio access networks. This leads to enormous energy consumption, high operational costs (OPEX), and also environmental and human concerns due to electromagnetic pollution. Hence, in a multi-operator environment, selecting the most efficient strategy among operators can tackle...
The residual BER — error floor, though useful and widely used metrics for the end-to-end digital radio transmission performance, provides no insight into the error-generating analog impairments (e.g. modulation inaccuracy, power amplifier compression, carrier recovery phase error, or I-Q cross-talk), which, however, are easy to identify by VSA tools such as constellation analysis. As the EVM analysis...
Cognitive radio is the fundamental component for the future generations of wireless communication. Indeed, by sensing its environment, the cognitive radio will be able to exploit unused frequencies for opportunistic wireless communications. In this paper, a new sensing method in the narrowband context is proposed for ray propagation channels by combining the spatial scanning technique with the maximum...
Future wireless networks are witnessing a major demand for mobile data, which necessitates reconsidering the design and deployment of their infrastructures. To fill this gap, the next-generation mobile 5G is defined as one of the promising solutions. Although the heterogeneous network, the small cell concept and the Cognitive Radio (CR) are considered as key drive technologies for 5G, the major challenge...
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