标题: 请教300220中narrowband与wideband 怎么判断 [打印本页] 作者: zhugeKM 时间: 2009-10-12 15:34 标题: 请教300220中narrowband与wideband 怎么判断 ETSI EN300220-1V2.1.1(2006-04)版本中定义narrowband:equipment to be used in a non-channelized continuous frequency band of equal or less than 200 kHz, or equipment to be used in a channelized frequency band with a channel spacing of equal or less than 200 kHz. 相对的宽带设备>200kHz;200KHZ指的是调制带宽? , O: ~( r+ m3 m3 n9 K( Y 但是在 ETSI EN300220-1V2.3.1(2009-04)版本中定义窄带:equipment to be used in a non-channelized continuous frequency band with a channel bandwidth of equal or less than 25 kHz, or equipment to be used in a channelized frequency band with a channel spacing of equal or less than 25 kHz.宽带对应>25kHz. 怎么定义都变化这么大,另外注意到以前比较老的版本2000版本也是于25kHz . 1 X; ^( I) H2 [7 t4 S# X/ P到底怎么来介定宽带设备还是窄带设备?non-channelized 和channelized又怎么来理解呢?非信道化和信道化,具体怎么理解?