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Cochin University of Science and Techology (CUST) 2005-6th Sem B.Tech Electronics and Communications Engineering (Supplementary) ,, EC 603 Communication Theory - Question Paper

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B. Tech Degree VI Semester (Supplementary) Examination

November 2005

BTSCQ -VI-(S) -05 - 074 (D)

Mtttoum Mario; 100

Time: 3 Hours


EC m COMMUNICATION THEORY (Prior to 2002 Admissions)


() Define tbe concept of mount of information, Efltropy and mlorrmuoe RaK wiA

B. Tech Degree VI Semester (Supplementary) Examination

November 2005

BTSCQ -VI-(S) -05 - 074 (D)

Mtttoum Mario; 100

Time: 3 Hours


EC m COMMUNICATION THEORY (Prior to 2002 Admissions)


the* unto    (6)

ft) For nnu|c tource with 2 messages. Show that tbe entropy is nmxixnoni when

B. Tech Degree VI Semester (Supplementary) Examination

November 2005

BTSCQ -VI-(S) -05 - 074 (D)

Mtttoum Mario; 100

Time: 3 Hours


EC m COMMUNICATION THEORY (Prior to 2002 Admissions)


fee two awnyi sre equally likely.    (4)

(c) A coo&bikks signal is bead fatted to 5KHz. The signs] u quantned in 8 level* of a PCM system wife the probalxblka 0J&5,0.2,0.10.1.0.1,0.05.0.05,005. Calculate che entropy mtd the rate of uiforraabon    (10)

OR

(a)    A OMShMU'synfcoWxiJ'fcXfcWifcX* with probabilities, 0.3,0.25.0.20k0.12,0-08 and 0.05 respectively. Construct a Shanaon-Fsav Code, and a Huflbua Code.

U.


B. Tech Degree VI Semester (Supplementary) Examination

November 2005

BTSCQ -VI-(S) -05 - 074 (D)

Mtttoum Mario; 100

Time: 3 Hours


EC m COMMUNICATION THEORY (Prior to 2002 Admissions)


Compare fee efficiencies of two coding schemes.    (10)

(b)    Define Shannon - Hartley theorem

B. Tech Degree VI Semester (Supplementary) Examination

November 2005

BTSCQ -VI-(S) -05 - 074 (D)

Mtttoum Mario; 100

Time: 3 Hours


EC m COMMUNICATION THEORY (Prior to 2002 Admissions)


Eiptta Baad widdi - SfN trade off    (10)


n. (a) ft)

IV. (a)


(10)

(10)

(10)

(10)


ft)


Explain different ARQ systems. Grapare their throughput efficiencies.

Expisio die method* used for Bunt error correction

Tbe b mb matrix for a (7,4). < yrtwntfk LBC ia given by > I 0]

I I 0 1 Find (he Generator Maeix. (GJ 10 1 I

Compute ibe syndrome for (he received veesor 0010111. Show that OHM] Explam the eaeodin procedure of aa (nJc*V) convolutional code with aa example.


V. (a) Sate and explain y four properties ofFourier Transform.    (10)

OR

VL (a) What b pre-envelope? Explam.    (I)

vn. (a) ft)

vm (a) ft)

(e)


Explain Gausuan and Rayleigh probability density (tactions.    (10)

Explain emulative Distribution Fraction (CDF) and probability Density Function (PDF) wfeh aa example. State their propertica.    (10)

OR

Define mean aad variance of a Random variable    (6)

Show that (be mean of the sum of two random variables b equal lo tbe sum of Che means if the variables are independent.    (6)

Explain eryodic process and stationary process.    (I)


DC. (a) Derive as expression for the quantization noise in PCM system, ft) Define Noise figure. Explain the calculation of Noise figure.

(10)

(10)

(10)

(10)

(10)


Derive tbe relationship between noise flgura aad equivalent noise resistance. OR

Derive aa expression for the output sipiat to quantization noiae ratio in Delta modulation

Describe tbe vwious types of noise, which affect (he communication process.


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