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Massive machine-to-machine (M2M) communication terminals can cause great challenges in cellular network. One of the critical challenges is to reduce network congestion and control signaling overhead. Most of data types in M2M communication is periodic data, which enables M2M user repetitively access networks, and inevitably lead to network congestion and large control signaling overhead. In this paper,...
In this paper, we focus on the problem of distributed precoding for simultaneous wireless information and power transfer (SWIPT) in a decode-and-forward (DF) multiple-input multiple-output (MIMO) relay network with two heterogeneous destination nodes, i.e., an information decoding (ID) receiver and a RF energy harvesting (EH) receiver. Since full channel state information (CSI) is usually unavailable...
This paper proposes a memory proportionate affine projection sign algorithm (IAF-MP-APSA) by assigning an individual activation factor to each filter coefficient. In this algorithm, each individual activation factor is calculated by past and current values of the corresponding coefficient magnitude. Moreover, taking into account the memory property of the proportionate factors leads to a decrease...
For convenience of analysis, empirical transmitter simplification is often introduced into visible light communication (VLC) channel modeling. This simplification induced impact on channel characteristics needs to be comprehensively evaluated. This paper addresses the applicability of this simplification. Six transmitter configurations with increasing LED-spacing in a LED transmitter of fixed number...
Visible Light Communication (VLC) using Light Emitting Diodes (LEDs) within the existing lighting infrastructure would reduce the implementation cost and may operate at higher throughput than RF or Infrared (IR) based wireless systems. One of the major concerns in VLC implementation is developing resource allocation schemes that maintain or increase channel throughput, ensure fairness and fast link...
Interleaving, as an important module of wireless communication system, is used to resist burst errors caused by frequency-selective fading. Low Density Parity Check Code (LDPC) tone mapping would be adopted for Orthogonal Frequency Division Multiplexing (OFDM) systems in IEEE 802.11aj (45GHz). In this paper, an optimal symbol interleaving parameter selecting (OSIPS) algorithm is proposed to get the...
Energy harvesting sensor networks sparked extensive research interest in recent years. However, little attention has been paid to sleep scheduling for area surveillance in rechargeable sensor networks. In this paper, we attempt to settle the problem of keeping rechargeable Wireless Sensor Networks operating for a long time while satisfying certain desired area coverage and energy consumption balance...
We investigate energy-efficient dispatching policy for virus scanning as service (VSaaS) under N-version protection. Under N-version protection, one would dispatch a file-scan request to multiple service engines, in order to reduce the missed detection error cost. However, this also increases the energy consumption of service engines and the queueing delay. To manage this tradeoff, we aim to reduce...
The exploitation of adaptive coding and modulation (ACM) increases a very large average capacity compared to the widely used DVB-S standard for the forward link of broadband communications. The optimized physical layer configuration (PLC) will further improve the link efficiency as the actual demodulator adapt to the working decision thresholds. We analyze the link performance with different physical...
A new dedicated resource allocation method for D2D communications in cellular systems employing fractional frequency reuse (FFR) is proposed in this paper. This method consists of three steps. For the first step, the permitted frequency resource set of each D2D link is determined. For the second step, a frequency resource assignment algorithm is proposed which takes both interference and load into...
The design of a wireless network is often critically affected by issues such as determining the optimal density of Access Points (APs) and optimal channel assignment by exploiting partially overlapped channels (POCs) for significantly improving the network performance in terms of maximizing the overall network capacity. Contemporary research works have traditionally dealt with these two problems in...
We introduce wavelet packet division multiplexing (WPDM) to Light-emitting diodes (LED)-based optical wireless communication systems. We first review the WPDM fundamental knowledge, and then provide a LED communication system diagram based on WPDM. Then, we evaluate the performance of the WPDM-based LED communication system, and compare it with the DC biased optical OFDM (DCO-OFDM)-based communication...
This paper studies the feasibility of using China Mobile Multimedia Broadcasting (CMMB) signal for passive radar detection. The research focuses on the analysis of CMMB signal properties which include signal structure, spectrum analysis, target resolution, ambiguity function and reduction of side lobes. Since CMMB signal has wide bandwidth and high power in its coverage area, it has great advantages...
Surveillance videos show a prominent feature of background redundancy. To full use this, we propose an adaptive background-frame based coding method for surveillance videos in this paper. In this algorithm, the adaptive background image is used as a long-term reference frame to provide better prediction for inter-frame coding. The background image is generated and updated dynamically by using layer...
In this paper, we propose a hybrid cellular network structure where co-frequency vertical coverage embedded on the cell edge, to improve the performance in the cell edge, using the cell interference depth as the interference threshold. Based on this proposed structure, three key performance metrics, i.e., the spectral efficiency, the cell throughput and the energy efficiency, are analyzed. The results...
In this paper, the optimal DC bias value of symmetric double-sided signal clipping in DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) visible light communication (VLC) system is deduced. Double-sided clipping is necessary due to the unipolarity of the optical intensity-modulated, direct-detected (IM/DD) system and power limit of the transmitter. Symmetric double-sided clipping...
Rapid demands for large capacity services and shortage spectrum resources have motivated the deployment of small cells in LTE-A network. Small cells are low-cost, low power nodes with limited coverage region, as the existence of small cells, more sophisticated network architecture increases the difficulty in dealing with mobility management. The contradiction between traffic demands and network resources...
This paper investigates the problem of joint user association and resource allocation in a downlink cognitive radio (CR) network. In the CR network, multiple cognitive base stations (CBSs) and multiple secondary users (SUs) are considered to share multiple channels with the primary user (PU) under the condition that the interference from the CR network to the PU is restricted. Exclusive user association,...
Orthogonal Frequency Division Multiplexing (OFDM), aided by proper channel coding schemes, can realize very dependable transmission in fading channels. For the purpose of improving the performance of the OFDM based DRM digital AM broadcasting in MF and HF channels, this paper designs MLC-LDPC-OFDM transmission scheme that is suitable for MF and HF channels. The equivalent channel capacities of MLC-LDPC-OFDM...
This paper investigates an energy efficient power allocation scheme in cognitive radio networks (CRNs), where secondary user (SU) may incorrectly sense the unlicensed spectrum and hence transmit data in collision. We aim to maximize the energy efficiency by optimal and low complexity power allocation design. At first, an energy efficient power allocation optimization problem with sensing errors is...
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