Dynamic Update Scheme of Spectrum Information Based on Spectrum Opportunity Incentive in the Database-Assisted Dynamic Spectrum Management

To solve the problem of delayed update of spectrum information(SI) in the database assisted dynamic spectrum management(DB-DSM), this paper studies a novel dynamic update scheme of SI in DB-DSM. Firstly, a dynamic update mechanism of SI based on spectrum opportunity incentive is established, in which spectrum users are encouraged to actively assist the database to update SI in real time. Secondly, the information update contribution(IUC) of spectrum opportunity is defined to describe the cost of accessing spectrum opportunity for heterogeneous spectrum users, and the profit of SI update obtained by the database from spectrum allocation. The process that the database determines the IUC of spectrum opportunity and spectrum user selects spectrum opportunity is mapped to a Hotelling model. Thirdly, the process of determining the IUC of spectrum opportunities is further modelled as a Stackelberg game by establishing multiple virtual spectrum resource providers(VSRPs) in the database. It is proved that there is a Nash Equilibrium in the game of determining the IUC of spectrum opportunities by VSRPs. Finally, an algorithm of determining the IUC based on a genetic algorithm is designed to achieve the optimal IUC. The-oretical analysis and simulation results show that the proposed method can quickly find the optimal solution of the IUC, and ensure that the spectrum resource provider can obtain the optimal profit of SI update.

Line spectrum detection algorithm based on the phase feature of target radiated noise

In order to improve the performance of line spectrum detection,according to the feature that the underwater target radiated noise containing stable line spectrum,the differences of the phase difference between line spectrum and background noise,a weighted line spectrum detection algorithm based on the phase variance is proposed in frequency domain.After phase difference alignment,the phase variance of line spectrum and the phase of background noise,respectively,are small and big in frequency domain,this method utilizes the weighted statistical algorithm to cumulate the frequency spectrum based on the phase variance,which can restrain the background noise disturbance,and enhance the signal to noise ratio（SNR）.The theory analysis and experimental results both verify that the proposed method can well enhance the energy of line spectrum,restrain the energy of background noise,and have better detection performance under lower SNR.

On Wyner-Ziv Problem for general sources with average distortion criterion

The Wyner-Ziv Problem for general sources with average distortion under fixed-length coding is investigated in this paper. To solve the problem,an enhanced covering lemma for a Markov chain is first established. Then based on the lemma,a general formula for the rate-distortion function of the problem is derived,where the distortion is only assumed uniformly bounded and may be nonadditive. Finally,it is further pointed out that such methods can be used to establish more general results on multiterminal source coding problems.

信息化条件下联合作战电磁频谱管控建设初探

电磁频谱管控（electromagnetic frequency spectrum management,EFSM）是联合作战中各作战单元有效联合的关键环节。加强信息化条件下联合作战电磁频谱管控建设是一项重大而又紧迫的课题。分析了信息化条件下联合作战对电磁频谱管控的总体需求,论述了电磁频谱管控建设的重点内容,最后提出了做好电磁频谱管控建设应着重把握的几个问题。

定向能武器在无人化战争中的制胜机理及运用特点

本文从近年来国外局部战争和地区冲突中无人化装备的实战运用案例出发,概述了无人化战争的发展趋势,阐述了无人化战争中制电磁权的重要作用。从电磁频谱空间攻防的角度,分析了定向能武器在无人化战争中的制胜机理和独特优势。基于公开报道的情报资料,本文研究了国外定向能武器的主要作战运用方式,总结了定向能武器在无人化战争中的作战运用特点及发展趋势,提出了我国定向能武器发展和应用的建议。

宽带扩频通信技术在桥隧信息化管理中的应用

介绍了扩频通信技术特点和扩频通信系统。叙述了扩频通信技术在桥隧信息管理应用中的网络拓扑结构,微波所承载的应用系统。分析了扩频通信技术组建专用信息化网络的特点和优势。

新时期居民健康服务需要发展与演化分析

随着城镇化、人口老龄化、信息化以及疾病谱的变化,我国居民的健康服务需要演化明显,而现行的服务供给体系存在明显的供给不足与供需失衡问题,在未来的政策制定中应考虑如何提升居民健康服务需要的满足程度,增加居民服务利用的满意度和改善居民的健康状况。