针对3GPP最新发布的LTE(long term evolution)Release 8标准,研究了LTE空中接口协议栈无线链路控制(radio link control,RLC)的子层确认(acknowledged mode,AM)传输模式的设计与实现机制。主要介绍了LTE无线接入网空中接口协议栈的结构...针对3GPP最新发布的LTE(long term evolution)Release 8标准,研究了LTE空中接口协议栈无线链路控制(radio link control,RLC)的子层确认(acknowledged mode,AM)传输模式的设计与实现机制。主要介绍了LTE无线接入网空中接口协议栈的结构,详细阐述了空中接口协议栈中RLC的AM数据传输模式的运行原理,最后根据协议设计了一种具体在协议栈软件中实现AM传输模式的方法。展开更多
In this paper we have accomplished one of the tasks of cognitive radio i.e. dynamic spectrum sensing by using wavelet based Synchrosqueezing transform [1], a novel technique, which was proposed to analyze a signal in ...In this paper we have accomplished one of the tasks of cognitive radio i.e. dynamic spectrum sensing by using wavelet based Synchrosqueezing transform [1], a novel technique, which was proposed to analyze a signal in time-frequency plane. The distinctive feature of this transform compared to other techniques is that it enables us to decompose amplitude and frequency modulated signals and allows individual reconstruction of these components. The objective is also to separate the occupied band into amplitude modulated and frequency modulated bands.展开更多
车载收音机主要包括收音和开关电源等模块,国内收音AM的频率范围为531~1 629 k Hz,目前开关电源芯片的开关频率一般为几百千赫兹。当开关电源的工作频率或者其2~3倍工作频率恰好在收音频段,则开关电源的开关噪声会干扰收音信号,从而影...车载收音机主要包括收音和开关电源等模块,国内收音AM的频率范围为531~1 629 k Hz,目前开关电源芯片的开关频率一般为几百千赫兹。当开关电源的工作频率或者其2~3倍工作频率恰好在收音频段,则开关电源的开关噪声会干扰收音信号,从而影响收音效果。因此,在选择和设计开关电源的频率时,需考虑将开关频率调到其他频率,从而避免其对AM搜台的影响。提出一种针对AM频段不同频点而采用电源不同开关频率的方案来解决开关电源对当前AM信号干扰的难题。展开更多
文摘针对3GPP最新发布的LTE(long term evolution)Release 8标准,研究了LTE空中接口协议栈无线链路控制(radio link control,RLC)的子层确认(acknowledged mode,AM)传输模式的设计与实现机制。主要介绍了LTE无线接入网空中接口协议栈的结构,详细阐述了空中接口协议栈中RLC的AM数据传输模式的运行原理,最后根据协议设计了一种具体在协议栈软件中实现AM传输模式的方法。
文摘In this paper we have accomplished one of the tasks of cognitive radio i.e. dynamic spectrum sensing by using wavelet based Synchrosqueezing transform [1], a novel technique, which was proposed to analyze a signal in time-frequency plane. The distinctive feature of this transform compared to other techniques is that it enables us to decompose amplitude and frequency modulated signals and allows individual reconstruction of these components. The objective is also to separate the occupied band into amplitude modulated and frequency modulated bands.
文摘车载收音机主要包括收音和开关电源等模块,国内收音AM的频率范围为531~1 629 k Hz,目前开关电源芯片的开关频率一般为几百千赫兹。当开关电源的工作频率或者其2~3倍工作频率恰好在收音频段,则开关电源的开关噪声会干扰收音信号,从而影响收音效果。因此,在选择和设计开关电源的频率时,需考虑将开关频率调到其他频率,从而避免其对AM搜台的影响。提出一种针对AM频段不同频点而采用电源不同开关频率的方案来解决开关电源对当前AM信号干扰的难题。
