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SYSTEM AND METHOD FOR PROTECTING TRANSMISSIONS OF WIRELESS MICROPHONES OPERATING IN TELEVISION BAND WHITE SPACE
SYSTEM AND METHOD FOR PROTECTING TRANSMISSIONS OF WIRELESS MICROPHONES OPERATING IN TELEVISION BAND WHITE SPACE
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机译:保护在电视频段白空间中工作的无线麦克风传输的系统和方法
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摘要
A method of determining whether a TV band channel is available for use by a TV band device a corresponding device, the method comprising: tuning to a TV band channel; detecting a pilot tone within the TV band channel to obtain a radio frequency signal, wherein the pilot tone is a single tone modulated by a modulating sequence {b} = {+M, -M, +M, -M, +M, -M, +M ...} with a predetermined signal period assigned such that a bandwidth of the modulated pilot tone is maintained within a narrowband centered on the location of an Advanced Television Systems Committee (ATSC) pilot for a DTV broadcast; down-converting the radio frequency signal received on the TV band channel to yield a down-converted signal; performing a predetermined number of Fast Fourier Transforms (FFTs) on the down-converted signal and accumulating an energy of respective bins associated with the respective FFTs; selecting a predetermined number of FFT bins centered at a mandated location of an Advanced Television Systems Committee (ATSC) pilot in the TV Band channel; and analyzing the selected FFT bins to determine if an energy spike is present in any one of the selected FFT bins.
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机译:一种确定电视波段频道是否可供相应的设备的电视波段设备使用的方法,该方法包括:调谐到电视频道;检测电视频带频道内的导频音以获得射频信号,其中导频音是由调制序列{b} = {+ M,-M,+ M,-M,+ M,- M,+ M ...},其中分配了预定信号周期,使得调制导频音的带宽保持在以用于DTV广播的高级电视系统委员会(ATSC)导频的位置为中心的窄带内;下转换电视波段频道上接收到的射频信号以产生下转换信号;对下变频后的信号执行预定数量的快速傅立叶变换(FFT),并累积与各个FFT相关联的各个仓的能量;选择预定数量的FFT仓,其中心位于电视波段频道中高级电视系统委员会(ATSC)飞行员的授权位置;和分析选定的FFT仓以确定在任何选定的FFT仓中是否存在能量尖峰。
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