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(d) 56 7. The output of a source is band limited to 6KHz.It is sampled at a rate of 2KHz above the nyquist‘s rate. If the Entropy of the sourceis2bits/sample, then the entropy of the source in bits/sec is (a) 12Kbps (b) 32Kbps (c) 28Kbps (d) 24Kbps 8. The channel capacity of a BSC with transition probability ½ is (a) 2bits (b) 0bits (c) 1bit (d) infinity 9. A communication channel is fed with an input signal x(t) and the noise in the channel is negative. The Power received at the receiver input is (a) Signal power-Noise power (b) Signal power +Noise Power (c) Signal power x Noise Power (d) Signal power /Noise power 10. White noise of PSD η/2 is applied to an ideal LPF with one sided band width of B Hz.The filter provides again of 2. If the output power of the filter is 8η ,then the value of Bin Hz is (a) 8 (b) 2 (c) 6 (d) 4 Answers 1.B
2.C 3.C 4.A 5.D 6.C 7.B 8.B 9.B 10.A Unit 4 CHOOSE THE CORRECT ANSWER 1. Which of the following is correct? (a) ThesyndromeofareceivedBlockcodedworddependsonthereceive<strong>dc</strong>odeword (b) ThesyndromeforareceivedBlockcodedwordundererrorfreereceptionconsistsofall1‘s. (c) ThesyndromeofareceivedBlockcodedworddependsonthetransmitte<strong>dc</strong>odeword. (d) The syndrome of a received Block coded word depends on the error pattern 2. A Field is (a) a group with 0 as the multiplicative identity for its members (b) a group with 0 as the additive inverse for its members (c) a group with1as the additive identity for its members (d) an A beli an group under addition 3. Variable length source coding provides better coding efficiency, if all the messages of the source are (a) Equiprobable (b) continuously transmitted
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DC COURSE FILE
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GEETHANJALI COLLEGE OF ENGINEERING
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Convolution Codes: Encoding, decodi
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III. To inculcate positive attitude
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7. Importance of the course and how
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DC 12: Compute the power and bandwi
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10. Course mapping with PEO’s and
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13.Micro plan : Sl. no Unit No. Tot
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14.Detailed Notes UNIT 1 : Elements
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A communication system may transmit
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the wavelength is extremely long, m
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asic elements of digital communicat
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4. Channel introduced many types of
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5. Bandwidth is another scarce reso
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Pulse Code Modulation ‣ PCM gener
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77777333333333333333333333333333333
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• The most common technique for s
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Pulse Code Modulation (PCM) : • P
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Figure 3.11 Illustration of the qua
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Quantization (nonuniform quantizer)
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Time-Division Multiplexing(TDM):
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Let m n where T The error signal is
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3. Simplify receiver design Because
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Figure 3.27 Block diagram illustrat
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Adaptive Differential Pulse-Code Mo
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ASK, OOK, MASK: • The amplitude (
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Frequency Shift Keying: • One fre
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s t Acos 2f ct 3 Acos 2f
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QAM and QPR: • QAM is a combinati
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Generation and Detection of Coheren
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Figure 6.29 Signal-space diagram fo
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UNIT 3 Base Band Transmission And O
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• The tails of hI(t) decay as 1/|
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• precoding d b d k k k2 symbol 1
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h( t) N 1 n w n sin c t T b
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• Equalization : to compensate fo
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e n y n 2E en 2E en 2Eenxnk
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- Flexibility - Same H/W may be tim
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Interpretation of Eye Diagram:
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The set of source symbols is called
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We will usually neglect to mention
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Note that if Condition1 is satisfie
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where dmin is the minimum Hamming d
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Linear Block Codes - example 1: •
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• S null can be represented by it
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G 1 0 I | P 0 0 0 1 0 0 0 0
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• Compared with the systematic co
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Convolutional Codes ◊ The encoder
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Convolution Codes ‣ Encoding, ‣
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x m m ''' j j 2 j Here each messa
Page 110: Representing convolutional codes: C
Page 113 and 114: - encoder state diagram for (n,k,L)
Page 115 and 116: • For this reason the non-survive
Page 117 and 118: sequence is 1 1 0 0 0 0 0 (why?). N
Page 119 and 120: Error Correction: • If there is n
Page 121 and 122: correct:1+1+2+2+2=8;8 ( 0.11) 0.88
Page 123 and 124: Motivation: Performance of Turbo Co
Page 125 and 126: Performance as a Function of Number
Page 127 and 128: General Model of Spread Spectrum Sy
Page 129 and 130: Slow and Fast FHSS: • Frequency s
Page 131 and 132: - 10 bit spreading code spreads sig
Page 133 and 134: Direct Sequence Spread Spectrum Usi
Page 135 and 136: 15.Additional Topics: Voice coders
Page 137 and 138: 'Toll Quality' voice coders, such a
Page 139 and 140: The well-known Shannon-Hartley law
Page 141 and 142: its for a known permutation of the
Page 143 and 144: 16. Question papers: B. Tech III Ye
Page 145 and 146: e received code word 110110. Commen
Page 147 and 148: 17. Question Bank 1. (a) State and
Page 149 and 150: 21. A Discrete Memory less Source (
Page 151 and 152: 19. Unit wise Bits CHOOSE THE CORRE
Page 153 and 154: (d) 5 Answers 1.C 2.D 3.B 4.A 5.C 6
Page 155 and 156: (b) its capacity gets doubled (c) i
Page 157 and 158: (d) 6 5. The cascade of two binary
Page 159: CHOOSE THE CORRECT ANSWER 1. The mi
Page 163 and 164: (b) H(X/Y)=1bit/message (c) H(X,Y)=
Page 165 and 166: (d) log m bits/symbol 6. Theencoder
Page 167 and 168: 3. .Under error free reception, the
Page 169 and 170: 10.B Code No: 56026 Set No. 1 JAWAH
Page 171 and 172: code No: 56026 Set No. 2 JAWAHARLAL
Page 173 and 174: B) (Power required)/( Minimum Band
Page 175 and 176: A) 5 B) 4 C) 2 D) 3 3. Which of the
Page 177 and 178: Code No: 56026 Set No. 2 JAWAHARLAL
Page 179 and 180: A) maximum when the source is conti
Page 181 and 182: Code No: 56026 :2: Set No. 4 II Fil
Page 183 and 184: Code No: 07A5EC09 Set No. 2 JAWAHAR
Page 185 and 186: Cont…..2 Code No: 07A5EC09 :2: Se
Page 187 and 188: 8) For the data word 1110 in a (7,
Page 191 and 192: a) 0 bits b) 1 bit c) 2 bits d) inf
Page 195 and 196: a) increase with its certainty of o
Page 197 and 198: Code No: 07A5EC09 :2: Set No.4 10)
Page 199 and 200: Amplitude of 1v.This speech signal
Page 201 and 202: . Self Information c. Logarithmic m
Page 203 and 204: 75. What are the advantages and dis
Page 205 and 206: 22. Discussion Topics: Data transmi
Page 207 and 208: Applications and history Data (main
Page 209 and 210: o o Mesh network Wireless network A
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25. STUDENTS LIST B.TECH III YEAR I
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48 13R11A04L3 M SAI KUMAR 49 14R18A
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Group 8: 36 13R11A04K1 POLISETTY VE
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Unit 2 Pulse-Amplitude Modulation :
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Unit 3 Differential Pulse-Code Modu
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MISSING TOPICS UNIT 1 Hartley's law
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encoding the desired information an
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• f c denotes center frequency
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An interleaver installed between th
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Subject Contents 1.7. 1. Synopsis p
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