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In this paper, we investigate the simultaneous wireless information and power transfer (SWIPT) in multi-user multiple-input multiple-output (MIMO) interference networks. In this system, each transmitter sends one data stream to its targeted receiver through beamforming, while each receiver divides the received signal into two signal flows via power splitting (PS), for information decoding (ID) and...
Cooperative positioning is a new paradigm in Global Navigation Satellite System (GNSS) positioning. By sharing information with other users and measuring geometrical range between them, the localizability and positioning precision of users can be improved. In this paper, we put forward a two user cooperative positioning model and a positioning algorithm. This paper analyzes the localizability of users...
Simple and effective image quality assessment (IQA) method is very desirable in many image and video processing applications, such as coding, transmission, restoration and enhancement. Classic pixel absolute error based objective IQA metrics such as mean square error (MSE) and corresponding peak signal to noise ratio (PSNR) are widely used for various applications due to low computation and clear...
In mobile satellite communication system, transmission power and frequency band are limited by the satellite inherent characteristic. And spot beam architecture is widely adopted with similar frequency reuse schemes in terrestrial cellular systems, in which the entire spectrum is orthogonally assigned to adjacent beams, resulting in a relatively lower system spectrum utilization. In addition, the...
This paper deals with the Bayesian parameter estimation for recursive convolutional sub-codes of turbo codes. A Monte Carlo method named Gibbs sampling is employed for this problem. The involved conditional probabilities of the encoder coefficients and the coded sequences are derived. Simulation results show that the proposed algorithm improves the estimation accuracy substantially.
In a cognitive radio system, proper configuration of sensing duration enables maximization of the data throughput. However, no existing straightforward formula is available, which is desirable in the mobile context due to tightness of computation time. A set of closed-form approximate formulae of optimal sensing duration for cognitive radio are derived under different signal to noise ratio (SNR)....
A new demand of three-dimensional (3D) coverage of wireless signals is arising, since the wireless traffics are gradually distributed in 3D space in the processes of urbanization and high-rise building's popularization. In this paper, 3D coverage control technology based on planar array antenna and 3D beamforming is investigated, and a novel control algorithm HEIS is proposed. Starting from the key...
Image compression had been extensively studied for reducing coding rate yet producing acceptable visual quality. However, there are many application scenarios where the compressed images are used for automatic recognition rather than human viewing, thus the visual quality is no longer critical for compression. SIFT features have demonstrated their utility in many recognition scenarios and SIFT-preserving...
Instant Messaging (IM) service has drawn growing attention in current wireless networks. However, the Quality of Experience (QoE) of IM service users are instable, since the IM service is not served with dedicated channel or guaranteed bandwidth. In this paper, we adopt a Representative Service (RS) based QoE model for IM service, and propose a scheduling algorithm to provide fair QoE to IM service...
Radar sensor deployment is of great importance for radar sensor network (RSN) provisioning. A RSN is effectively deployed to detect multi-target within a given surveillance area with required detection performance and energy consumption. In this paper, we explore two deployment strategies-Hexagonal Deployment Strategy(HDS) and Diamond Deployment Strat-egy(DDS). We propose two decision fusion rules...
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...
This paper presents a new method for constructing a conflict graph for D2D communications in cellular systems, which is useful for efficient radio resource allocation for D2D links. The construction is an iterative process which includes a broadcast-and-acknowledgment protocol. The convergence and delay performance of the proposed constructing process is theoretically analyzed. Simulation results...
In this paper, we propose a new joint beamformer and offset design method for visible light communication (VLC) with multiple red/green/blue light emitting diodes (RGB LED). We take into account key practical lighting constraints including optical power, color illumination, non-negativeness, CRI and LER, and formulate a non-convex optimization problem to minimize the system mean squared error (MSE)...
In this paper, the beamforming designs for uplink virtual MIMO systems are investigated. In such systems, the most challenging difficulty in beamforming designs comes from the fact that the nodes consisting the virtual MIMO are subjected to individual power constraints or named per-antenna power constraints instead of sum power constraints. The instinct individual power constraints for virtual MIMO...
Polar codes can be used to achieve secrecy capacity of degraded wiretap channels. In this paper, we propose a feedback-based secrecy coding scheme using polar code over non-degraded wiretap channels. With the feedback architecture, the proposed secrecy coding scheme can significantly obtain a positive secrecy rate. Moreover, polar codes have low complexity of encoding and decoding, which is good for...
This paper addresses the adaptive coding problem for mobile satellite communication systems with the dual-polarized multi-input multi-output (MIMO) deployment. In general, the satellite communication systems have a long channel delay, and then traditional adaptation schemes suffer from performance degradation. To overcome this drawback, we propose to add statistical channel state information (CSI)...
The problem of multi-cell multi-user uplink sum-power minimization with required quality of service (QoS) under imperfect Channel State Information (CSI) and Probabilistic Contraints (PrCons) is solved. This paper is an extension of our previous work on statistical-CSI and PrCons. Deterministic constraints at times are infeasible or too expensive to implement, further, the CSI could be imperfect due...
This paper is mainly to deal with the problem of direction of arrival (DOA) estimations of coherent sources in impulsive noise fields modeled as α-stable distribution. Two new algorithms based on singular value decomposition (SVD) and fractional lower order statistics are proposed. The proposed methods rebuild a matrix by using the eigenvector corresponding to the largest eigenvalue obtained from...
Small cell is a flexible solution to satisfy the continuously increasing wireless traffic demand. In this paper, we focus on on-off switch operation on small cell base stations (SBS) in heterogenous networks. In our scenario, the users can either choose SBS when it is active or macro cell base station (MBS) to transmit data. Start-up energy cost is considered when SBS switches on. The whole network...
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