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3821.使用地标照片匹配和智能字符识别的移动旅游规划
[信息传输、软件和信息技术服务业] [2014-04-14]
In this paper,we attempt to design a mobile application to assist visitors to have better understandings of popular tourist destinations and related routing information while on tour.The users can obtain descriptions of a specific attraction by simply taking the picture of a landmark photo often shown in the travel booklet using their mobile devices.This is achieved by matching the landmark picture with an image database containing popular tourist spots to locate the interested destination.The location information is further confirmed using techniques in intelligent character recognition.Upon successful identification of the interested location,tourist information regarding this destination,along with the routing details will be delivered using location-based service.We anticipate the proposed mobile application to effectively assist foreign visitors by bringing comprehensive,up-to-date tourist information and promoting better travel experience.
关键词：通信；移动设备；地标照片匹配；智能字符识别
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3822.一个室内无线通信的数据传输系统设计
[信息传输、软件和信息技术服务业] [2014-04-14]
The indoor communications is a new market in the future.This Article introduces one data transmission system based with OFDM signals.The overview of the communication system and synchronization theory background will be introduced.The simulation results shown in this article implies that this OFDM system achieves excellent performance for indoor wireless communication.
关键词：通信；室内无线通信；数据传输系统；OFDM；
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3823.纳型卫星平台的小型化的方向回溯阵列天线
[信息传输、软件和信息技术服务业] [2014-04-14]
A retrodirective antenna array (RDA) is capable of autonomously steering its radiation pattern toward the source of an interrogating signal, without having prior knowledge of the interrogator location. Integrating an RDA into a mobile platform, such as a nanosatellite, presents unique challenges due to the platform's restrictions in terms of size, weight, and power limitations. This project focused on developing novel RDA architectures that are directly suited for this resource-constrained platform. The three new RDA architectures that were developed during this research project are described. They are based on slope detection, null scanning, and a combination of power detection and null
scanning.
关键词：通信；通信和无线电系统；天线阵；卫星通信；方向回溯阵列天线
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3824.LEO卫星通信中多普勒频移估计与补偿的硬件实现
[信息传输、软件和信息技术服务业] [2014-04-14]
In the low earth orbit (LEO) satellite communication systems,in which receiver and transmitter are not fixed and have significant relative velocity,the fast time-varying Doppler frequency shift is high,which degrades the performance of acquisition and tracking.Doppler frequency shift and Doppler frequency rate can be calculated by the terrestrial system based on the satellite orbit and the relative velocity.In this paper,we introduce the Doppler compensation principle and the realization of Doppler shift estimation and compensation on an universal wireless signal processing platform.The experimental results showed that the Doppler compensation model have high accuracy,which is positively correlated with the Doppler frequency rate.
关键词：通信；卫星通信；近地轨道；多普勒频移；多普勒补偿
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3825.基于ZigBee和RFID技术的无线传感器网络开发
[信息传输、软件和信息技术服务业] [2014-04-14]
The technical features of RFID and sensor network,and inherits the RFID radio frequency signal characteristic of automatic target recognition,at the same time,the implementation of a wireless sensor network active perception and communication function.This paper analyzed the wireless sensor network integration of ZigBee and RFID technology; each node can be coordinated in real-time monitoring,sensing and collecting network of regional distribution of a variety of environmental or monitoring information.The paper puts forward the development of wireless sensor network based on ZigBee and RFID technology.Wireless sensor network is Zigbee and GSM is used for data communication based on sensor networks.
关键词：通信；无线传感器网络；ZigBee；RFID
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3826.航空通信中MQAM信号的识别
[信息传输、软件和信息技术服务业] [2014-04-14]
For the complex recognition of signals in the aeronautical communication,the recognition of the star-type MQAM signals is studied under the aeronautical channel.The different scenarios of the aeronautical channel are analyzed and the reasonable channel model is established.The high order cumulant recognition algorithm which applies to the aeronautical channel is proposed,the invariant classification characteristics of modulation signals are constructed by this algorithm,and this algorithm is improved by using the receive diversity technique.Simulation results show that this algorithm significantly improves the correct recognition rate of the received signals has the good anti-fading and anti-noise performance and meets the requirements of the modulation recognition of MQAM signals under the aeronautical channel.
关键词：通信；调制识别；航空信道；高阶累积量；MQAM信号
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3827.基于多核的并行处理技术的研究
[信息传输、软件和信息技术服务业] [2014-04-14]
In this paper,five kinds of typical multi-core processers are compared from thread,cache,inter-core interconnect and etc.Two kinds of multi-core programming environments and some new programming languages are introduced.Thread-level speculation (TLS) and transactional memory (TM) are introduced to solve the problem of parallelization of sequential program.TLS automatically analyze and speculate the part of sequential process which can be parallel implement,and then automatically generate parallel code.TM systems provide an efficient and easy mechanism for parallel programming on multi-core processors,Typical TM likes TCC,UTM,LogTM,LogTMSE and SigTM are introduced.Combined the TLS and TM can more effectively improve the sequential program running on the multi-core processors.Typical extended TM systems to support TLS likes TCC,TTM,PTT and STMiite are introduced.
关键词：通信；多核；并行编程环境的并行语言；TLS；TM；TLS+TM
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3828.认知无线电网络的联合功率分配和中继选择算法
[信息传输、软件和信息技术服务业] [2014-04-14]
This paper investigates the joint power allocation (PA) and relay selection scheme (RS) intwo-way relaying cognitive radio networks consisting of multiple user-pairs and multiple relays.In order to reduce the computational complexity for practical scenario,we propose a branch and bound based (BnB-based) power allocation and relay selection scheme and a greedy power allocation and relay selection scheme to maximize the system throughput.The system is assumed under the constraint that the interference power from the secondary nodes in two way relay systems to primary user (PU) shall be less than a predefined interference threshold which can guarantee the normal communication of PU.Numerical simulation results show that the optimal PA and RS scheme has the highest system capacity,however,the greedy PA and RS scheme has the lowest complexity.The proposed BnB-based PA and RS scheme has the better tradeoffofsystem throughput and complexity than the above two schemes.
关键词：通信；功率分配；中继选择；认知无线电网络
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3829.一种应用于UWB采样的定位的新的模拟信息转换器结构设计
[计算机、通信和其他电子设备制造业] [2014-04-14]
UWB signals are very suitable for localization,since their high time resolution can provide precise time of arrival (TOA) estimation.However,a major challenge in UWB signal processing is the requirement for high sampling rate.The theory of compressive sensing (CS) makes processing UWB signal at a low sampling rate possible via analog-to-information converter (AIC) if the signal has a sparse representation in a certain space.In this paper,a new framework called residual analog-to-information converter (RAIC) is proposed to improve AIC performance by adding a signal prediction/cancellation module in front of AIC.The structure of RAIC is designed and analyzed.
关键词：通信；模拟信息转换器；压缩传感；超宽带；定位
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3830.船舶运动虚拟仿真中基于DCOM的组通信的应用
[信息传输、软件和信息技术服务业] [2014-04-14]
Virtual reality based visual interactive simulation system is proposed and completed,which applied integrated intelligent control to ship steering and main engine.For the multipoint communication of the proposed distributed visual simulation system,a DCOM based communication model is discussed.The group communications is divided into three layers from bottom to top.Based on static and dynamic combined algorithm,a dispatcher using centrality load balancing is also presented.
关键词：通信；DCOM；组通信；船舶运动虚拟仿真
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