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Xia Z.-P.,Academy of Broadcasting Science | Dong L.,Sinocom Leader Information Technology Co. | Hu J.,Academy of Broadcasting Science | Zou F.,Academy of Broadcasting Science
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2011

In this paper, a field test and data analysis method for S-band China mobile multimedia broadcasting(CMMB) signal coverage is presented. The test scene and experiment model of related trial, as well as the data analysis process are introduced. During the data analysis process, ICS Telecom frequency plan software is used to estimate the coverage firstly. And then measured data is imported to ICS Telecom software after being screened. Finally, both estimated data and measured data are compared with statistical method, and prediction errors of each model are visualized in MapInfo software. By this method, the most precise one can be found among several S-band radio propagation models in similar terrains and propagation scenarios. The method can provide reference for the S-band networking planning of CMMB service. Copyright © 2011 by Editorial Department of Chinese Journal of Radio Science.

Li Y.,Beijing University of Posts and Telecommunications | Guo X.,Academy of Broadcasting Science | Wang H.,Beijing University of Posts and Telecommunications
2015 Visual Communications and Image Processing, VCIP 2015 | Year: 2015

In this paper, we propose an adaptive spatio-temporal quality pooling scheme for video quality assessment (VQA) considering the uniformity of distortion distribution and visual attention. A uniformity index is defined according to the distribution of localized distortions in one frame, and is utilized to generate a saliency map from the visual attention model, to incorporate temporal memory effect, and to adaptively pool the localized spatio-temporal quality indices. The proposed scheme outperforms the traditional mean-based pooling scheme and shows competitive performance against well-known VQA algorithms when tested on two publicly available video quality databases. © 2015 IEEE.

Qi J.,Beijing University of Posts and Telecommunications | Li X.,Academy of Broadcasting Science | Su F.,Beijing University of Posts and Telecommunications | Tu Q.,Beijing University of Posts and Telecommunications | Men A.,Beijing University of Posts and Telecommunications
2013 Picture Coding Symposium, PCS 2013 - Proceedings | Year: 2013

Rate-distortion optimization is widely used in modern video codecs to make various encoder decisions in order to optimize the trade-off between bit-rate and quality. The distortion models used in HEVC are mean squared error (MSE) and sum of absolute difference (SAD), both of which are not always reflective of perceptual quality. In this paper, we show that SSIM, which has been found to be a good indicator of image visual quality, can be used as the distortion metric in the RDO framework in a simple yet effective manner by modifying the Lagrange multiplier used in RDO with the difference of motion homogeneity. Experiments show that the proposed scheme can achieve better rate-SSIM performance and provide higher subjective quality when compared with HEVC test model 10 (HM10.0) anchor. © 2013 IEEE.

Academy Of Broadcasting Science, Oriental Cable Network Co., Zte Corporation and Chinese Academy of Sciences | Date: 2014-09-10

The present invention relates to an intelligent television operation system, comprising an application frame layer combining and repackaging each component interface and logic of component layer to simplify reusing mechanism of application for components of the component layer; an application execution environment layer providing execution explaining environment of application codes; a component layer comprising a digital television-associated component for supporting an intelligent television application, wherein each component provides a standard universal component interface for the application frame layer; a hardware abstraction layer performing abstraction on hardware functions of Linux core layer, hiding hardware interface details and providing virtual hardware platform to provide unified interface for the component layer, whereby the component layer is hardware-irrelevant and transplanting on multiple platforms is facilitated; and a Linux core layer managing process, managing memory, realizing network protocol and providing drive program for hardware platform of a intelligent television.

Qi L.,China Mobile | Yan X.Z.,Academy of Broadcasting Science
2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014 | Year: 2014

In the same frequency networking environment, the neighbor cell density is evenly user (neighboring cell are equal when the number of users), the total throughput of the single-user and the variation of the cell as follows: Network traffic prediction, data flow prediction model plays an important role. There are some differences in the data business model than traditional circuit domain model, the circuit domain model analysis usually discrete state Markov model, the existing network of environmental data and business user reach you obey Poisson distribution, long exponentially distributed service, and each user exclusive a channel resources. To improve data flow model consistency with the existing network, improve network planning rationality, based on the business itself and the community in line with the rate of change in the characteristics of a continuous process (and users to share data resources), and traffic flow model with the more common: Such as roads and resources channel resources are shared resources, user rates are in line with the continuity of the trend. When a small number of users, the total throughput of the cell to maintain stability in the higher range, and the rapid decline in single-user rate trends; while large number of users, the total throughput of the cell to some extent, remain stable, and the single-user rate decreased gradually slowdown. © 2014 IEEE.

Wang Y.,Communication University of China | Wang H.,Communication University of China | Zhu B.,Communication University of China | Wang X.,Academy of Broadcasting Science
International Conference on Communication Technology Proceedings, ICCT | Year: 2012

In this paper, we propose a single channel polyphonic signal separation algorithm based on Bayesian harmonic model and a novel Multi-F0 estimation method. The algorithm estimates Multi-F0 by analyzing the spectrum with a novel Multi-F0 estimation method that consists of two parts. At first, part 1 estimates F0s with no multiple relation, and then the undetected F0s are estimated in part 2. Other audio parameters are extracted by the Bayesian harmonic model which is based on RJMCMC method. The algorithm can be applied to separation of audio mixtures with polyphony of two to four, and experimental results show that the proposed algorithm can separate single channel polyphonic signals effectively. © 2012 IEEE.

Zou F.,Academy of Broadcasting Science | Shi Y.,Academy of Broadcasting Science | Wang F.,Academy of Broadcasting Science
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB | Year: 2015

The paper firstly describes the characteristics and structure of the new generation broadcasting data network (NGB-E, Next Generation Broadcasting - Evolution) in China, integrated by cable, Wireless and satellite networks. Then this paper details the technical scheme of Adaptive Wi-Fi network and Wireless bidirectional network working on the UHF frequency band. At last, based on the technical scheme, we give the working thoughts and object of NGB-E. © 2015 IEEE.

Ma Y.,Academy of Broadcasting Science
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB | Year: 2014

Changes in household demand environment bring impact on the home networking and home gateway. To realize a bright future of the home gateway based on digital cable TV set-top box, which has many features and advantages, in this paper, it mainly discusses that feature-oriented modification for access control, and provides the preliminary framework of solution to achieve intelligent home, under the conditions of safe and manageable. © 2014 IEEE.

Wang X.,Academy of Broadcasting Science
Proceedings of the 2012 International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC 2012 | Year: 2012

In traditional research on task scheduling algorithms based on user satisfaction, all users can only have the same satisfaction function that means system assumes all users have the same scheduling motivation. But in real distributed system, different users usually have different motivations. To solve this problem, in this paper, we propose a genetic scheduling algorithm based on user overall satisfaction, which is the sum of the value of every user satisfaction. This algorithm supports different satisfaction functions for different users, which meets the requirements of real distributed environment well. © 2012 IEEE.

Li J.L.,Academy of broadcasting science | Yin Y.B.,Academy of broadcasting science
Applied Mechanics and Materials | Year: 2013

A thorough OFDM parameter design method of a digital broadcasting system in FM band is presented in this paper. Key OFDM parameters are analyzed from their constraints. Cyclic prefix should satisfy the requirement of channel delay and formation of SFN. Design of system bandwidth should consider coherent bandwidth and existing frequency planning. Symbol duration is restricted by time selectivity and frequency selectivity of the channel, and also efficient SINR should be maximized. System simulation is performed to test and verify the parameters under typical FM band channels. A set of OFDM parameter is provided for future design. © 2013 Trans Tech Publications Ltd, Switzerland.

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