[123doc] - bai-giang-ly-thuyet-trai-pho.pdf

7/25/2019 [123doc] - bai-giang-ly-thuyet-trai-pho.pdf

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Hng dan mon hoc:

LY THUYET TRAI PHO VAA TRUY XUAT VO TUYEN

GVGD: Pham Thanh am

Khoa Vien thong II-PTITEmail: [email protected]

HP: 0908.127721
mailto:[email protected]:[email protected]


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Mc tiu mn hc:

Cung cp cho hc vin:Nhng kin thc c bn v lnh vc

a Truy Xut (Multitple Access)nhFDMA, TDMA;

C s l thuyt k thut tri ph, mtk thut nn tng trong CDMA.

Nhng ng dng CDMA trong cc hthng vin thng thc t.


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Ti liu tham kho

1. L thuyt tri ph v ng dng, tcgi: Nguyn Phm Anh Dng.(tham

kho chnh)2. L thuyt tri ph (dnh cho h

TTX Tham kho ph)


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Ni dung chi tit:

Gm 5 bi:Bi 1: n li nhng kin thc lin quan.

Bi 2: a truy xut.

Bi 3: C s l thuyt tri ph.

Bi 4: Cc phng php tri ph.Bi 5: M tri ph.


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Bi 1: Nhng kin thc lin quan

K thut iu ch s. (ASK, FSK,

PSK, QPSK)Nhng thng s nh gi chtlng. (SNR, BER).

Nhng hin tng xy ra trongtruyn sng. (Suy hao, Fading,Doppler


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Bi 2: a truy xut (Multi Access)

Khi nim a truy xut, v d.

Nguyn l,u nhc im ca:

FDMA;

TDMA;PDMA.


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Bi 3: C s l thuyt tri ph

Cc hm ton hc: hm tng

quan, hm mt ph CS.Cc khi nim: ph ca tn hiu, rng ph.

Tn hiu s v ph ca n.


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Bi 4: Cc phng php tri ph

Khi nim v tri ph.

Nhng vn pht sinh khi triph (BW, SNR).

Cc phng php tri ph:

Trc tip (DS).

Nhy tn (FH).


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Bi 5: M tri ph

Cc loi chui PN (Chui m, chui

Gold, chui Walsh).ng b PN.

ng b th,

ng b tinh.


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Cu hi n tp:

1. Phocua tn hieu lag? orongphcua t/h c tnhnhthenao?

2. Cng thc ham mat ophocng suat cua t/h sova

dang phoca n.3. Trai pholag? Khi trai phoS/N cua t/h thay oi nhthe

nao? Chng minh.4. Cach thc hien trai phovagiai trai phoDS.

5. Trong DS, ieu kien can thiet etrai phoc lag?


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Cu hi n tp:

6. Trong k thuat trai pho, ieu kien can thiet ethu ctn hieu lag?

7. So sanh DS/BPSK vi DS/QPSK di cac goc o: BW,

PG, SNR, dung lng vaobao mat.8. M lag? Tai sao gi lam? M c ng dung

nhng u?9. Tnh chat cua chui PN lag? Cac loai chui nao s

dung trong trai pho.10. Tai sao trong trai phokhng dung chui ngu nhin.


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Cu hi n tp:

11. K thuat trai phovak thuat nen d lieu cogkhac ,giong nhau?

12. Chng minh hethong DS khng cokhanng chong

nhiu AWGN.13. Chng minh hethong DS cokhanng chong Fading

a ng.14. Khanng chong nhiu phabng hep cua DS nhthe

nao.15. Trong FH, thenao lanhay tan nhanh; nhay tan cham?


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Cu hi n tp:

16. Trnh bay nguyn lycua FDMA, TDMA vaCDMA.17. Nu cach phan biet user trong FDMA, TDMA va

CDMA.

18. Trong phng phap a truy xuat nao t/h c truyenlin tuc.

19. ong bolag? Trong FDMA, TDMA vaCDMA, nhngphng phap nao can ong bo.

20. Dung lng cua hethong phuthuoc vao yeu tonaooi vi FDMA, TDMA, CDMA?


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Cu hi n tp:

21. Hethong nao codung lng cng? dung lng mem.22. Hethong nao nn chuyen giao cng, hethong nao nn

chuyen giao mem.23. CDMA vaTDMA conhng iem nao giong nhau; khacnhau?

24. Thenao laDS-MC. K thuat DS-MC u iem hn DSiem nao?

25. FH khac vi DS nhng iem nao?


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Cu hi n tp:

26. CDMA vaFDMA coiem ggiong nhau, khac nhau?27. Trong CDMA, dung chui PN cotoc ocao th coli g,

bat li g?

28. Tai sao cng ngheCDMA cho dung lng cao hn cacphng phap khac?

29. Trong di ong CDMA, chuyen giao cng th comat dlieu khng? V sao?

30.Trong CDMA, dung chui PN cotoc othap thcolig, bat li g?


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Bi tp tri ph

Trong mot may phat s dung ieu che BPSKco toc o d lieu 2 Mbps. Tnh o rong phocua tn hieu RF trong 2 trng hp sau va

giai thch:a. Tan so song mang 1.5 Mhz.b. Tan so song mang 1.5 Ghz.


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Bi tp tri ph

Bit tn s sng mang ln


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Bi tp tri ph


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Bi tp tri ph

Trong mot he thong DS/BPSK co toc o d lieu 2 kbps.Biet PN s dung la chuoi m c tao ra t a thc tao

ma la 111010011 vi tan so CK 10MHz, tan so song mang2 Ghz.

a) Co bao nhieu a thc tao ma nguyen thuycung bac vi a thc tren?

b) Tnh o li trai pho bang dB.


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Bi tp tri ph


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Bi tp tri ph


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Bi tp tri ph


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Bi tp tri ph

Trong mot he thong DS/QPSK co toc o d lieu 4 Mbps. Biet cacPN s dung la chuoi m c tao ra t a thc tao ma bac 7.

a) Neu a thc tao ma nguyen thuy th chu ky cua chuoiPN la bao nhieu?b) Co bao nhieu a thc tao ma nguyen thuy cung bac vi

a thc tren?c) Tnh o li trai pho (bang dB) trong 2 trng hp sau:

Tan so song mang 1.5 Mhz.Tan so song mang 1.5 Ghz.

Biet rang moi bit d lieu s dung het 1 chu ky cua PN?

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