探讨新型数字调制方式在广电信号传输中的应用、发展趋势及其面临的挑战。介绍高阶调制技术、正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)等手段在高清电视、卫星通信、移动广播及多媒体广播中的具体应用,阐述新型...探讨新型数字调制方式在广电信号传输中的应用、发展趋势及其面临的挑战。介绍高阶调制技术、正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)等手段在高清电视、卫星通信、移动广播及多媒体广播中的具体应用,阐述新型数字调制方式在提高频谱效率和信号稳定性方面的优势,指出高阶调制技术所带来的信号质量要求和解调复杂度等挑战,展望新型数字调制技术的发展趋势,为广电信号传输技术的持续创新与发展提供参考。展开更多
In Bangladesh, more than a dozen of private TV channels are operating and about 10 new channels are waiting with green signal for transmission. Bangladesh Television （BTV）, the only government owned and administered...In Bangladesh, more than a dozen of private TV channels are operating and about 10 new channels are waiting with green signal for transmission. Bangladesh Television （BTV）, the only government owned and administered, and known as structurally a biased institution serves the audience the public service information most. At the same time it serves purposes of incumbent government. Public information （PI） broadcast means broadcasting towards public welfare which may bring about change in the betterment of life and work of people. Its main focus would be on information, education, and motivation values rather than entertainment. In case of information, dissemination, and documentation, all private TV channels in Bangladesh serve more entertainment and less public service information, whereas, BTV＇s focus is evident on more PI. The owners and operators of private channels think first of their business profit as well as pressure from government and political parties. During formulating planning and strategies or building program content, they become cautious as they fear that the government become angry and shut down the channel.展开更多
文摘探讨新型数字调制方式在广电信号传输中的应用、发展趋势及其面临的挑战。介绍高阶调制技术、正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)等手段在高清电视、卫星通信、移动广播及多媒体广播中的具体应用,阐述新型数字调制方式在提高频谱效率和信号稳定性方面的优势,指出高阶调制技术所带来的信号质量要求和解调复杂度等挑战,展望新型数字调制技术的发展趋势,为广电信号传输技术的持续创新与发展提供参考。
文摘In Bangladesh, more than a dozen of private TV channels are operating and about 10 new channels are waiting with green signal for transmission. Bangladesh Television （BTV）, the only government owned and administered, and known as structurally a biased institution serves the audience the public service information most. At the same time it serves purposes of incumbent government. Public information （PI） broadcast means broadcasting towards public welfare which may bring about change in the betterment of life and work of people. Its main focus would be on information, education, and motivation values rather than entertainment. In case of information, dissemination, and documentation, all private TV channels in Bangladesh serve more entertainment and less public service information, whereas, BTV＇s focus is evident on more PI. The owners and operators of private channels think first of their business profit as well as pressure from government and political parties. During formulating planning and strategies or building program content, they become cautious as they fear that the government become angry and shut down the channel.
