Two wireless technologies, WiMAX based on IEEE standards and LTE standardized by 3GPP, are two competing technologies, nevertheless, are very technically similar. This competition started with the advent of their pre-4G versions (802.16e for mobile WiMAX and 3GPP release 8 for LTE) and continued with the advent of their 4G versions (WiMAX 2.0 based on ...

Orthogonal Frequency Division Multiplex/Offset QAM (OFDM/OQAM) has been proven to be a promising Multi-Carrier Modulation (MCM) technique for the transmission of signals over multipath fading channels. However, OFDM/OQAM has also the intrinsic disadvantage of high Peak-to-Average-Power Ratio (PAPR) that should be alleviated. In this paper, a novel SeLective Mapping (SLM) method is proposed for OFDM/OQAM ...

In this paper, the authors focus on resource block allocation issue in the downlink transmission systems of the Long Term Evolution (LTE). In existing LTE standards, all Allocation Units (AUs) allocated to any user must adopt the same Modulation and Coding Scheme (MCS), which is determined by the AU with the worst channel condition. Despite ...

In this paper, component carrier selection and beamforming on carrier aggregated channels in heterogeneous networks are proposed. The scheme jointly selects the component carrier and precoding (i.e. beamforming) vectors with the co-operation of the other cells to deal with the interference between Macro cell and Pico cell. The component carrier selection and beamforming is achieved ...

In wireless network, terminals are usually energy constrained. In order to extend the lifetime of the terminal, the limited energy must be utilized in an efficient manner. In this paper, under the constant transmission power scenario, the authors propose an Energy Efficient Transmission Policy (EETP) which is derived by using Markov Decision Process (MDP). The ...

Virtualization is the key technology of cloud computing. Network virtualization plays an important role in this field. Its performance is very relevant to network virtualizing. Now-a-days its implementations are mainly based on the idea of Software Define Network (SDN). Open vSwitch is a sort of software virtual switch, which conforms to the OpenFlow protocol standard. ...

In this paper, the authors propose a fine-grained grid-based multi-objective model which aims at optimizing base station antennas’ configurations, such as transmit power, antenna tilt and antenna azimuth, in order to upgrading network performance in cellular networks. As the model is non-convex, non-smooth and discrete and computationally expensive, they use decomposition method to solve the ...

In this paper, to support services differentiation, the analytical model of delay preemption based priority is developed, and an improved scheme LDPP is proposed to alleviate the over-occupancy of buffer from low priority in heavy load. The composite scheme based on preemption and small buffers is an efficient method for contention resolution. To support services ...

Orthogonal Frequency Division Multiplex/Offset QAM (OFDM/OQAM) has been proven to be a promising Multi-Carrier Modulation (MCM) technique for the transmission of signals over multipath fading channels. However, OFDM/OQAM has also the intrinsic disadvantage of high Peak-to-Average-Power Ratio (PAPR) that should be alleviated. This paper focuses on the reduction of the clipping noise and out-of band ...

Recently, Quality of Experience (QoE) of voice service has been paid more attentions because it represents the performance of voice service subjectively perceived by the end users. And speech quality is commonly used to measure the QoE value. In this paper, a speech quality assessment algorithm is proposed for GSM network, aiming to predict and ...