【摘 要】
：
A joint channel selection and power control scheme is developed for video streaming in device-to-device (D2D) communications based cognitive radio networks.In particular,physical queue and virtual queue models by applying ‘M/G/1 queue\' and ‘ M/G/1 queu
【机 构】
：
State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China;College
论文部分内容阅读
A joint channel selection and power control scheme is developed for video streaming in device-to-device (D2D) communications based cognitive radio networks.In particular,physical queue and virtual queue models by applying ‘M/G/1 queue\' and ‘ M/G/1 queue with vacations\' theories are built up,respectively,to evaluate the delays experienced by various video traffics.Such delays play a vital role in calculating the packet loss rate for video streaming,which reflects the video distortion.Based on the distortion model,a video distortion minimization problem is formulated,subject to the rate constraint,maximum power constraint,primary users\' tolerant interference constraint,and secondary users\' minimum data rate requirement constraint.The optimization problem turns out to be a mixed integer nonlinear programming (MINLP),which is generally nondeterministic in polynomial time.A Lagrangian dual method is thus employed to reformulate the video distortion minimization problem,based on which the sub-gradient algorithm is used to determine a relaxed solution.Thereafter,applying the iterative user removal yields the optimal joint channel selection and power control solution to the original MINLP problem.Extensive simulations validate our proposed scheme and demonstrate that it significantly increases the peak signalto-noise ratio (PSNR) compared with the existing schemes.
其他文献
With the popularity of adaptive multi-rate wideband (AMR-WB) audio in mobile communication,many AMRWB based techniques,such as a similar compression architecture to transmit secret information during the process of compression,were proposed to transmit co
Non-binary low density parity check (NB-LDPC) codes are considered as preferred candidate in conditions where short/medium codeword length codes and better performance at low signal to noise ratios (SNR) are required.They have better burst error correctin
To solve the efficiency problem of batch anonymous authentication for vehicular Ad-hoc networks (VANET),an improved scheme is proposed by using bilinear pairing on elliptic curves.The signature is jointly generated by roadside unit (RSU) node and vehicle,
Hard competition learning has the feature that each point modifies only one cluster centroid that wins.Correspondingly,soft competition learning has the feature that each point modifies not only the cluster centroid that wins,but also many other cluster c
The state-of-the-art soft-output decoder of polar codes is the soft cancellation (SCAN) decoding algorithm,which performs well at the cost of plentiful computations.Based on the SCAN decoding algorithm,a modified method with revised iterative formula is p
The problem of solving differential equations and the properties of solutions have always been an important content of differential equation study.In practical application and scientific research,it is difficult to obtain analytical solutions for most dif
This paper investigates the propagation of computer viruses and establishes a novel propagation model.In contrast to the existing models,this model can directly indicate the impact of removable media and external computers on the propagation of computer v
Aiming at the statistical sparse decomposition principle (SSDP) method for underdetermined blind source signal recovery with problem of requiring the number of active signals equal to that of the observed signals,which leading to the application bound of
An optimized Neumann series (NS) approximation is described based on Frobenius matrix decomposition,this method aims to reduce the high complexity,which caused by the large matrix inversion of detection algorithm in the massive multiple input multiple out
Similar to the analysis of Turbo codes,the parallel concatenated systematic polar code (PCSPC) can also be analyzed by the extrinsic information transfer (EXIT) chart.The convergence of the iterative decoding based on soft cancellation (SCAN) and belief p