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CONTENT
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Business is the human activity related to material things. It is necessary for civilization.
To compete in the challenging global environment, companies are changing their business processes by extending them to include other
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Business is the human activity related to material things. It is necessary for civilization.
PERCEPTUAL
PERCEPTUAL
PRECISENESS
PERCEPTUAL
supply chain.
To compete in the challenging global environment, companies are changing their business processes by extending them to include other companies in the
supply chain.
To compete in the challenging global environment, companies are changing their business processes by extending them to include other companies in the

明白为何出发，就是最好的开始。少 先队员， 最用心的演示，只为你而做。 更多精彩，请在稻壳儿搜索：少先队 员。
少先队员
明白为何出发，就 是最好的开始。少 先队员， 最用心的 演示，只为你而做。
少先队员
明白为何出发，就 是最好的开始。少 先队员， 最用心的 演示，只为你而做。
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明白为何出发，就是最好的开始。少先队员， 最用心的演示，只为你而做。 更多精彩，请在风云网搜索：少先队员。
春暖花开简约PPT模板
THE POWERPOINT TEMPLATE
In order to be irreplaceable , one must always be different.
汇报人：少先队员
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01
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2013
2014
2015
2016
少先队员
明白为何出发，就 是最好的开始。少 先队员， 最用心的 演示，只为你而做。
少先队员
明白为何出发，就 是最好的开始。少 先队员， 最用心的 演示，只为你而做。
少先队员
明白为何出发，就是最好的开始。少先队 员， 最用心的演示，只为你而做。更多精 彩，请在风云网搜索：少先队员。
少先队员
明白为何出发，就是最好的开始。少先队 员， 最用心的演示，只为你而做。更多精 彩，请在风云网搜索：少先队员。
少先队员

• Carrier synchronization • Symbol/Bit synchronization • Frame synchronization
2
Synchronization
Carrier synchronization (载波同步） Receiver needs estimate and compensate for frequency

1 2
f
t

1 2
f
t cos 2ct

1 2
a sin 2ct
After
the
LPF
s0
t

1 2
f
t
DSB, SSB and PSK are all capable of pilot-tone insertion method. VSB can
also apply pilot-tone insertion method but with certainLeabharlann modification.9
Carrier Synchronization
To extract the carrier：
1. Pilot-tone insertion method
Sending a carrier component at specific spectral-line along with the signal component. Since the inserted carrier component has high frequency stability, it is called pilot (导频).
small phase difference. 2. PLL has the character of narrowband filtering which can eliminate the