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通信原理 PowerPoint PPT Presentation


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通信原理. 周又玲 电话: 66278682 (办) 66257348 (家) E-Mail [email protected] 教材: 《 通信原理 》 (第 5 版),樊昌信 等编著,(北京)国防工业出版社 2001.5 参考文献: 数据通信原理, R.W. 勒基 等著,人民邮电出版社 现代通信原理,曹志刚、钱亚生 编著,清华大学出版社 通信原理,周炯槃、庞沁华 等编著,北京邮电大学出版社 现代通信原理与技术,张辉、曹丽娜 编著,西安电子科技大学出版社 数字通信, John G. Proakis 著,张力军、张宗橙、郑宝玉译,电子工业出版社

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通信原理

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5477756

66278682

66257348

E-Mail [email protected]


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  • 5 2001.5

  • R.W.

  • John G. Proakis


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  • 302010

  • 70


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  • 1.1

  • 1.2

  • 1.3

  • 1.4

  • 1.5


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  • 1844

    1876

    1864

    1887

    20

1.1


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  • 2030

  • ISDN


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1.2


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1.2


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  • 1.

    2.

    AMSSBDSBVSB

    FMPM

    ASKFSKPSKDPSK

    3.

    4.

    5.FDMTDMCDM


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  • A/D


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1.3


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  • I Px

  • I=I[Px]

  • PxI Px=1I=0

  • I[P(x1)P(x2) ]=I[P(x1)]+I[P(x2)]+

    I=a = -aP(x)

    a=10 a=e a=2

1.4


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  • Px= I=1bit

  • Px= I=2bit

  • Px= I=3bit

1.4


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  • nx1x2xnPx1Px2Pxn

    H (bit/

    Entropy

    Px1=Px2==Pxn=

    Hx

    Hmax= bit/

1.4


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  • RB BRb bit/s

1.5


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Rb=RBH

RB=Rb

N Rb=RB2N

1.5


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  • 0

    (1) 0 500125125250

    (2) 250


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(1) 1000

1000 RB=1000 Bd

P(0)=

P

=

P()=

=

P

H(X)=(

1+

3+

2)bit/=1

bit/

=

Rb=(10001

)bit/s=1750 bit/s

(2)

H(X)=2 bit/

Rb=(10002)bit/s=2000 bit/s


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  • 125 S256

    2S3

1.

2.

3 .

4 .

5 .

Rb=256 24/125S=4.096106

RB=256/125 S = 2.048106 B

Pe =3/ 2.048106 2=0.7310-6


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