已知某 [tex=2.214x1.0]+pu/2HykVjAoxdYAu8sRNw==[/tex]系统的码元传输速率为 [tex=4.357x1.214]RTuHDI5KN+4PUIIbcqU59A==[/tex] 所用的载波信号为[tex=6.929x1.571]dec1jzqSVKbh0/ip2bEwM/ir7KztYR/IbP/zQrvsW1fBQ1GKAUFYlMFg4TLZQuME[/tex][tex=0.357x1.286]6j3SW9vu/Wo8SpTC/QbBlQ==[/tex]。[tex=1.214x1.286]b05N/7NYPh6to/3pWZjU5A==[/tex]设所传输的数字信息为[tex=3.0x1.0]/xJfoLAWGeJaJ/vKCSC/QQ==[/tex] , 试画出相应的[tex=2.143x1.0]nxnRgfmIijLZtBTue5ZiUw==[/tex]信号波形示意图;[tex=1.214x1.286]jXY7VBJoWFWM2j60mau4zQ==[/tex]求 $u_{ ASK }$ 信号的带宽。

2022-06-04

已知某 [tex=2.214x1.0]+pu/2HykVjAoxdYAu8sRNw==[/tex]系统的码元传输速率为 [tex=4.357x1.214]RTuHDI5KN+4PUIIbcqU59A==[/tex] 所用的载波信号为[tex=6.929x1.571]dec1jzqSVKbh0/ip2bEwM/ir7KztYR/IbP/zQrvsW1fBQ1GKAUFYlMFg4TLZQuME[/tex][tex=0.357x1.286]6j3SW9vu/Wo8SpTC/QbBlQ==[/tex]。[tex=1.214x1.286]b05N/7NYPh6to/3pWZjU5A==[/tex]设所传输的数字信息为[tex=3.0x1.0]/xJfoLAWGeJaJ/vKCSC/QQ==[/tex] , 试画出相应的[tex=2.143x1.0]nxnRgfmIijLZtBTue5ZiUw==[/tex]信号波形示意图;[tex=1.214x1.286]jXY7VBJoWFWM2j60mau4zQ==[/tex]求 $u_{ ASK }$ 信号的带宽。

答案：

解: [tex=35.571x2.429]fqglyZ/vnKiTdyXvIVEOHzB6Q7Me/m3I3/Q739XolfCl4yVonqn00ePRSaaH/F5ToFpe4BozqEdyoHiqYPmTXZeeXGA81mZPT6zemf1OX0fTkMH/3LB4EQWMeW6hE3XT25SdIig8ghX1mRfAAtd/Xvo5bY3+DubJZGgytyPkSDAKt2KemK3HWtRcSftV6XMlnE3+v4ckFzSOWBb4aAa9nCXNjKoytixgYCHYqn8Rx3MANx+t2VbITFe53TO5J2a7TRnmnEyag36kdkzkhbqpSv0ZtV8OhhKzr4UzFJZJvWs=[/tex][tex=31.643x2.786]PjN0WMxck1I0kQlrlci2U1ZOXR+StXfmmtfd2qgnB1jMyoBqP3ixSjrThCzryG2QAeYoiw2VIIOTaM8L25+e4awJGgcktHRb2DIvf9hLoRJzUVwNW1xxrrBljrQGN1OkGR64PPHhbwZXW6xUfgF+3v7GcgTasKs0hLJEonEVuHZQTzab+KTQoBHjMqzZy/0awylrEF421yFX/CG2s9Km0mqlXYQYgB0v0tTJh+RFDOpDUTvAUi2mf8nA/D3RTobZcuLf5RTRJDQyOQv0ZXgVicrHnVe77AUOGYL3p9fvt+k=[/tex][tex=23.0x2.429]PjN0WMxck1I0kQlrlci2Uz/eOSHLsIF5yw8BYr9PvnVC/tT7Iddo/fyJ/LD25/hTjLNT4ifFrH6Djg1jiKtti+6IYHgx9O+i6qUnbqo6wPFbjeLs7/TmpftL7O76xoqEEgtWQnSSlFK8JckPOxddUIx7wTZZE8UpbWTi5JS5BJh4N9llfnuYtMhc/2gFUZka[/tex][tex=27.286x2.429]PjN0WMxck1I0kQlrlci2U69R1h80zN/xaYKSN+0ul16Y9Mz+FT+SdEUti4QkauPR5jEZWO3fcmdyqW0OCJ9kxQnmRFLRfISK38zetSkvwB7lQI1wRT0rk6vhuowbo/Ya3Uiph2BovVDNs+oRnRDoNnT81ilrrCUv+lDKCupiQB8kl3umCGurIf9R175l3v9M1AjO/p5RSK3jaeY/7qjBG/knoXFzSSK5pPMMfhlG9mjREKRoy9vo3fCC1E4qrqyg[/tex][tex=20.786x2.786]J7vQc8g2ZqbeUlJX2FJIpxfJKowsphPofI5D6VisBUzgZI0w5k9dP2SPckJaIppyUDe3JIfz48J6RcIj4ai2xn9KDYAeBU4/DihlVXD/IvBbLGhkjHLhQ2BglbJgW97sc6UFMzYHe2Viwe+aN4qOWDozUBIpiFWacqVoI+TAxRcXUIQrH9m6Mpnq2X+j1KooQQUWwYgS2oHFosAp7B1EhXAlkRK4i0TutOyjAHX4naI=[/tex][tex=23.429x2.429]PjN0WMxck1I0kQlrlci2Ux7qVq+vCVeI63wHOWiyF3/lYIfHwxH2I7x3v9pU97wXgEUl+F37Uo2rG2orvVwVpHWtOpA6uoomQPhVHUnGYoYm1a2JijfryFY6+3SWcgWyyI7lQzoLfuuE7Uu3pSUS5G5Uo6wJuTAggWcmnAoLy5ESnK9xz+Tq7GqlQ3Q/gIBWcJdxQMkBh8fxLd2wa8CsYSFBqCYuwxkzN4ro3Yl7EFM=[/tex][img=518x478]17ad7210dc5f6b0.png[/img][img=535x248]17ad72129946376.png[/img]

举一反三

内容

0
由非空集合X的所有子集构成的集合称为X的幂集，记作[tex=1.143x1.214]6fgP1j+0v37iZFMJocAU+g==[/tex].（1）设X={a,b,c}，求[tex=1.143x1.214]6fgP1j+0v37iZFMJocAU+g==[/tex].（2）设X是由n个元素组成的有限集，证明[tex=1.143x1.214]6fgP1j+0v37iZFMJocAU+g==[/tex]中含有[tex=1.0x1.0]j//x0/Z+ltpf5R8ThFOpMA==[/tex]个元素.
1
对于以下两种情形:(1)x为自变量,(2)x为中间变量,求函数[tex=2.214x1.214]sy9gaFRMGlrH59gm9bWSDg==[/tex]的[tex=1.5x1.429]5W5tOYbJ+LlsRP2dMsi4byxwtjvvL/3u7NEzPV5PWp0=[/tex]
2
已知调角波 [tex=18.143x1.571]e8Ww75SkZ310KDXOW8w2JsQwRkLVNqABpd0K1JzSPWwtsrTYPS9u1bHezNph6lVu5hi/j0QoJYAez0GShfj5KJOShzG2U1+kW2zmFOXfw1o=[/tex]试确定：[tex=1.214x1.286]b05N/7NYPh6to/3pWZjU5A==[/tex] 最大频偏;[tex=1.786x1.286]vR0uZJ0+MnChig/sIe/LgQ==[/tex]最大相偏;[tex=1.857x1.286]5XR7zNOYx/ceQ2xW3UiHHA==[/tex]信号带宽;[tex=1.857x1.286]A0KctjXKuQU/DTslFUCtHg==[/tex]此信号在单位电阻上的功率; [tex=1.214x1.286]G8+Av0/uzlegEQpk0wx2fQ==[/tex]能否确定这是[tex=1.643x1.0]cRo4R1BuoSAjAih90mgpbA==[/tex]还是 [tex=1.643x1.0]HHWYGesjVfCBMm+fIgmVMg==[/tex]波?
3
设有一个[tex=2.643x1.0]K+aYSTyNnTUtcEbgJnPkfw==[/tex]信号, 其码元传输速率为 [tex=3.286x1.0]+IkF/GAtdMEOKoYk9tq/Xw==[/tex], 载波波形为[tex=7.286x1.357]dec1jzqSVKbh0/ip2bEwM4MV8jk+E9jv4HRh9ktEQouENEQEjZfXdpQEnz3cm9Rs[/tex] 。若发送"0"和“1"的概率分别是[tex=1.286x1.0]NAcFSszUtTps6kN7Z6zqLg==[/tex]和[tex=1.286x1.0]ysyzaenL1AVV6/Gs9jwT9g==[/tex], 试求此信号的功率谱密度的表达式。
4
判断下列命题是否为真：（1）[tex=3.643x1.357]/5abqJjwKZ1qr+6hsVFF5EBvfq3ggOFNlHMClz0h9nk=[/tex]（2）[tex=2.929x1.357]rGJpyjIjJpbcoBTWxP0Jiw==[/tex]（3）[tex=4.5x1.357]2wycHMoqU83MyEp17iBils58bR7YLuCTI2G9NVAdlfY=[/tex]（4）[tex=5.214x1.357]CTz2gu+IIm1GgNmYMGaduCRtA41wnW4WqwRWwEhq6aA=[/tex]（5）[tex=4.857x1.357]1DcE2BMMOaZhTuxR/mjgsboXxfg5ET59Dp4I/jjEDuw=[/tex]（6）[tex=4.643x1.357]BSryrsQYOvTP2hTWRu6t4nAuJwlSs4L9jaq70EpB+Us=[/tex]（7）若[tex=6.0x1.357]y0IZLUnBO88nR8WBZYvd7QXv5S1OMINV5cQNzPyiyAc=[/tex]，则[tex=3.429x1.357]1brfPwTkVVIX4GfoMIUskA==[/tex]（8）若[tex=7.643x1.357]MhLfJXZnhbXiB0x3oNtFzThV4Y1mJxe1VYr7PkJE/T6hmTD3WWp+UxbNwvUQ6DHk[/tex]，则[tex=4.143x1.357]LZUA94ISo1po5HWsOVeBCjo0rMvj7uw3bGw5HiZenrI=[/tex]