The multilevel modulation techniques nf M-Differential Amplitude Phase Shift Keying (DAPSK) have been proposed in combination with Turbo code scheme for digital radio broadcasting bands below 30 MHz radio channel. Com...The multilevel modulation techniques nf M-Differential Amplitude Phase Shift Keying (DAPSK) have been proposed in combination with Turbo code scheme for digital radio broadcasting bands below 30 MHz radio channel. Comparison of this modulation method with channel coding in an Additive White Gaussian Noise (AWGN) and multi-path fading channels has been presented. The analysis provides an iterative decoding of the Turbo code.展开更多
The frequency bands used in mobile communications are allocated according to the type of application. With the need for more channels, the frequency spectrum has become a scarce natural resource. This study shows the ...The frequency bands used in mobile communications are allocated according to the type of application. With the need for more channels, the frequency spectrum has become a scarce natural resource. This study shows the results of a proposed modulation using a variation of the autocorrelation of pseudo-random codes to carry information. The work also presents the generation of multiple orthogonal axes to increase the bit rate thus improving the channel efficiency.展开更多
This paper aims to present a digital radio broadcasting system that explores the advantages of pseudo-random codes. In this context, a transmitter and its dual receiver are able to reuse frequency spectrum bands witho...This paper aims to present a digital radio broadcasting system that explores the advantages of pseudo-random codes. In this context, a transmitter and its dual receiver are able to reuse frequency spectrum bands without interfering on other existing communication systems. It is proposed a communication system that allows radio broadcasting with the following characteristics: lower transmission power, new communication channels and digital signal processing techinques to add positioning services in two dimensions.展开更多
Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students ...Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students put emphasis on vocabulary and background knowledge and they were aware of the approaches to better listening comprehension and making some practical preparations before doing the listening tasks. However some differences exist between the effective listeners and less-effective listeners,specially regarding to speech rate and out-of-class relevant practice.展开更多
Radio is all about dreams. This old and tired medium now fights with new media as it is with its old enemy television. Radio has a big impact on dreams. It gives you the sound and makes you dream. Once you get used to...Radio is all about dreams. This old and tired medium now fights with new media as it is with its old enemy television. Radio has a big impact on dreams. It gives you the sound and makes you dream. Once you get used to this media you start dreaming. If you used to listen radio more, you get in dependence with it. So this day dreaming change to lifeless dreaming. This article gives an evaluation of how radio audience can shape audience future dreams with dependence theory. The paper starts with a conceptual explanation of dependence theory and goes on with a survey done in Turkey to 101 radio listeners. The survey investigates on how people like listening the radio and what makes them enjoy radio. The survey assumes that people listening to radio and getting depended on it start changing the behaviors and habits of listeners. This behavior change effects listeners future dreams and the audience take radio as a model. The paper shows by using the dependence theory that radio listeners take the radio they love as model and use it to build their future business dreams.展开更多
对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电...对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电源设备技术架构成为一个关键问题。主要探讨了广播电视制播工程项目中UPS电源设备的选用,对UPS高频机和UPS工频机进行了比较分析,进而给出了广播电视制播工程中UPS电源设备的选用策略。展开更多
探索将万维网地理信息系统(Web Geographic Information System,WebGIS)技术引入数字无线电广播发射覆盖分析领域,重点研究数据处理、平台搭建、模型构建及可视化分析等关键技术环节,并探讨覆盖优化调整的策略与方法。通过构建高精度数...探索将万维网地理信息系统(Web Geographic Information System,WebGIS)技术引入数字无线电广播发射覆盖分析领域,重点研究数据处理、平台搭建、模型构建及可视化分析等关键技术环节,并探讨覆盖优化调整的策略与方法。通过构建高精度数据集、搭建高效WebGIS平台、改进传播模型、开发可视化分析工具等手段,力图为无线电广播网络的精细化规划和智能化管理提供新的思路和方法。展开更多
基金Supported by the National Natural Science Foundation of China (No.60072013)
文摘The multilevel modulation techniques nf M-Differential Amplitude Phase Shift Keying (DAPSK) have been proposed in combination with Turbo code scheme for digital radio broadcasting bands below 30 MHz radio channel. Comparison of this modulation method with channel coding in an Additive White Gaussian Noise (AWGN) and multi-path fading channels has been presented. The analysis provides an iterative decoding of the Turbo code.
文摘The frequency bands used in mobile communications are allocated according to the type of application. With the need for more channels, the frequency spectrum has become a scarce natural resource. This study shows the results of a proposed modulation using a variation of the autocorrelation of pseudo-random codes to carry information. The work also presents the generation of multiple orthogonal axes to increase the bit rate thus improving the channel efficiency.
文摘This paper aims to present a digital radio broadcasting system that explores the advantages of pseudo-random codes. In this context, a transmitter and its dual receiver are able to reuse frequency spectrum bands without interfering on other existing communication systems. It is proposed a communication system that allows radio broadcasting with the following characteristics: lower transmission power, new communication channels and digital signal processing techinques to add positioning services in two dimensions.
文摘Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students put emphasis on vocabulary and background knowledge and they were aware of the approaches to better listening comprehension and making some practical preparations before doing the listening tasks. However some differences exist between the effective listeners and less-effective listeners,specially regarding to speech rate and out-of-class relevant practice.
文摘Radio is all about dreams. This old and tired medium now fights with new media as it is with its old enemy television. Radio has a big impact on dreams. It gives you the sound and makes you dream. Once you get used to this media you start dreaming. If you used to listen radio more, you get in dependence with it. So this day dreaming change to lifeless dreaming. This article gives an evaluation of how radio audience can shape audience future dreams with dependence theory. The paper starts with a conceptual explanation of dependence theory and goes on with a survey done in Turkey to 101 radio listeners. The survey investigates on how people like listening the radio and what makes them enjoy radio. The survey assumes that people listening to radio and getting depended on it start changing the behaviors and habits of listeners. This behavior change effects listeners future dreams and the audience take radio as a model. The paper shows by using the dependence theory that radio listeners take the radio they love as model and use it to build their future business dreams.
文摘对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电源设备技术架构成为一个关键问题。主要探讨了广播电视制播工程项目中UPS电源设备的选用,对UPS高频机和UPS工频机进行了比较分析,进而给出了广播电视制播工程中UPS电源设备的选用策略。
文摘探索将万维网地理信息系统(Web Geographic Information System,WebGIS)技术引入数字无线电广播发射覆盖分析领域,重点研究数据处理、平台搭建、模型构建及可视化分析等关键技术环节,并探讨覆盖优化调整的策略与方法。通过构建高精度数据集、搭建高效WebGIS平台、改进传播模型、开发可视化分析工具等手段,力图为无线电广播网络的精细化规划和智能化管理提供新的思路和方法。
