摘要：radio sound is a key signal sound in Toni Morrison’s 2003 novel *** intertwining of memories and radio music constitutes an intriguing window on how radio sound serves as a vehicle for exploring the cultural and historical implications of African American women’s listening experiences with home radio,as is presented by Toni Morrison in her first new millennium novel *** from a simple sonic link with the larger external world,radio sound in is a primary means for individual nostalgia,collective memory,and expression of auditory *** is a mechanical sound which conveys a particular“black restorative nostalgia.”

摘要：本文提出了一种基于软件无线电的短波电台模拟器设计方法。模拟器前端采用Vue3实现,后端利用Python开发,网络通信基于WebSocket完成,同时结合GNU radio平台和Lime-SDR硬件完成了短波电台模拟器的软硬件实现。文中提出的短波电台模拟器设计方法具有极好的灵活性和扩展性,适用于各种型号短波电台模拟器的快速开发,可以大大降低短波电台模拟器的成本,具有很好的应用前景。

摘要：采用GNU radio技术及与其配套的硬件前端USRP设计和实现了230 MHz软件无线电多通道主站电台。该主站电台在调制方式上与现有无线电台设备全面兼容,覆盖了整个电力系统230 MHz全双工频段,可以同时在多个频点以不同的速率和调制方式与不同制式的从站电台进行双工通信。所提出的方案可以充分利用230 MHz无线频率资源,增加终端接入数量,提高通信系统组网的灵活性和可靠性,同时有效降低维护和升级的成本。

摘要：A meteorological data acquisition system is built using a PIC16F877A microcontroller and electric output-based sensors. This system is programmed in C language using the PCWH compiler. It is smart, accurate, cheap, small, light and easily movable. It is designed to automatically get instantaneous measurements of air temperature, atmospheric pressure, and relative humidity. Depending on their utilisation, these measurements are collected with repetition rate tuneable from one minute to one hour. They are displayed on LCD screen and transferred to a personal computer where they are stored and processed. As an application, such data are recorded in situ and used to estimate the radio refractivity of air near the ground in real time. This parameter is necessary to account for the propagation of radiofrequency waves through the lower atmosphere, during wireless transmissions.

摘要：This paper presents a modification of an existing cognitive antenna design which contains two antennas: one is a sensing that covers the band from 1 - 11 GHz and the other is a hybrid triangular reconfigurable antenna. Two antennas are combined together to create a new design which called Cognitive Antenna. The new shape of the reconfigurable antenna will affect the cognitive antenna so as to work at two different frequencies via rotation by 180°. At each rotation, the antenna takes single frequency from number of possible frequencies that sensing antenna would find.

摘要：开发了基于GNU radio的信号分析与处理实验平台。借助GNU radio完全开源的信号分析处理平台,既能够提供开放式可修改的模块库,以便快速建立关于信号处理的流程并进行内容设计、仿真,又能够用来连接真实的信号接收和处理系统,方便进行综合性和探究性实验设计。该实验平台的建立,方便学生以更加灵活的学习形式获取专业的资源,进行更加灵活多样的学习和互动,并有助于提高实验教学效果。

摘要：针对单极型马赫曾德尔电光调制器在radio over Fiber(RoF)和副载波复用系统中的应用,讨论了输入两路射频信号的情形,给出了电光调制器互调失真的严格通用解析解。该解析解可用于表示任意阶的互调失真项和谐波项。数值结果表明了该解析解的正确性。分析结果表明,调制器的三阶互调失真与调制器偏置相移无关,只与输入射频信号的调制系数有关,并且当外加偏置电压等于调制器的半波电压时,只存在偶数阶的失真项。根据该解析解,可方便地设计模拟光通信系统,精确地预计外调制器的非线性特征,优化系统性能。

摘要：广播（收音机）曾经是我们主要的信息来源和娱乐工具，在很长一段时间内与电视平分天下，今天广播已经风光不再了。尽管我们还能常常看见其身影，音质没有突破，内容匮乏，广告充斥，除了移动性能超过电视外，广播似乎优势尽失，即使这一点点优势也正被多媒体手机和诸如MP3等新兴移动媒体设备一步步蚕食。

摘要：该文对HD radio FM数字音频广播系统的发射、接收系统以及实现程序进行了设计和探讨,并验证了合理性。

摘要：The purpose of this paper is to build a secured and reliable vehicle anti-theft system which will have the ability to access the vehicle subsystems from a remote location where there is GSM network. And also, the design method involves the interfacing of GSM/GPRS modem module with the vehicle ignition subsystem, and the test result shows that it performs some control actions on the vehicle subsystems from a mobile phone, having taken the advantage of the wide coverage area of some GSM networks. Hence the topic is “Remotely Controlled Vehicle Anti-theft System via GSM Network”.