Digital Communication I: Modulation and Coding Course-Lecture 10 potx

... Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 10 Lecture 10 20 Trellis – cont’d 1/11 0/00 0 /10 1/11 1/01 0/00 0/11 0 /10 0/01 1/11 1/01 1/00 0/00 0/11 0 /10 0/01 0/00 0/11 0/00 6 t 1 t 2 t 3 t 4 t 5 t 1 ... 0 11 10 00 10 11 Input bits Output bits Tail bits Lecture 10 2 Last time, we talked about:  Channel coding  Linear b...

Ngày tải lên: 30/03/2014, 10:20

... values boundaries Quant. levels 111 3.1867 110 2.2762 101 1.3657 100 0.4552 011 -0.4552 010 -1.3657 001 -2.2762 000 -3.1867 PCM codeword 110 110 111 110 100 010 011 100 100 011 PCM sequence amplitude x(t) Lecture ... immunity  Implementation cost and complexity Digital Communications I: Modulation and Coding Course Term 3 – 2008 Catharina Logothetis Lecture 2 Lecture...

Ngày tải lên: 23/03/2014, 10:21

... iEE sii s s ski Ed ki Ed 2 2 min , = ≠ = Digital Communications I: Modulation and Coding Course Term 3 - 2008 Catharina Logothetis Lecture 5 Lecture 5 20 Eb/No figure of merit in digital communications  SNR or ... noise vector are i.i.d Gaussian random variables with zero-mean and variance . The noise vector pdf is  The elements of observed vector are independent Gaussian...

Ngày tải lên: 23/03/2014, 10:21

... R k n R c       = )( cB pfP = Digital Communications I: Modulation and Coding Course Term 3 - 2008 Catharina Logothetis Lecture 13 Lecture 13 20 Design example of coded systems …  Choose a modulation/ coding scheme ... signaling  Bandwidth efficiency:  Assuming Nyquist (ideal rectangular) filtering at baseband, the required passband bandwidth is:  M-PSK and M-QAM (b...

Ngày tải lên: 30/03/2014, 10:20

... Digital communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 6 Lecture 6 10 The raised cosine filter  Raised-Cosine ... noise and no ISI) Lecture 6 17 Example of eye pattern: Binary-PAM, SRRQ pulse …  AWGN (Eb/N0=20 dB) and no ISI Lecture 6 18 Example of eye pattern: Binary-PAM, SRRQ pulse …  AWGN (Eb/N0 =10 dB) and ... with ISI: Bi...

Ngày tải lên: 18/10/2013, 06:15

... Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 10 Lecture 10 10 Effective code rate  Initialize the memory before encoding the ... it.  Example: 1100 1 0101 0 1 1100 1 1101 1 :sequenceOutput 001 :sequenceInput 21 uu Branch word Register contents 1 1100 0101 1 1 1101 11 0000000 1 1101 11 OutputInput m Modulo-2 sum: Lectu...

Ngày tải lên: 25/10/2013, 06:15

... code 0101 1 0100 1 0101 0001 0101 0 0100 000 100 100 0100 00 11 1100 0 0100 0 000 1101 101 1101 1 0101 0 1101 1 0101 001 1100 1100 1100 0100 00 0101 1100 0101 111 1101 01 1101 1000 1100 0 1101 1100 0 010 000 1101 10 0100 1 1100 1 0100 0101 1 1101 1011 1101 0100 0001 000111 1100 1101 1101 1 0100 1101 1100 1101 0 1101 00000000 LL M MMM Coset ... aaababa )( and )( FV ∈+=+⇒∈∀ uvvuvu, )()(,...

Ngày tải lên: 25/10/2013, 06:15

... ffree dd or Lecture 12 8 Example of hard-decision Viterbi decoding )100 ( ˆ =m ) 1100 1 1101 1( ˆ =U )101 (=m )1 1100 0101 1(=U )0 1101 1101 1(=Z 0 2 0 1 2 1 0 1 1 0 1 2 2 1 0 2 1 1 1 6 t 1 t 2 t 3 t 4 t 5 t 1 0 2 ... from the received sequence Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 12 Lecture 12 5 Soft and hard dec...

Ngày tải lên: 29/10/2013, 13:15

... then: 0 2 0 1 2 1 0 1 1 0 1 2 2 1 0 2 1 1 1 6 t 1 t 2 t 3 t 4 t 5 t 1 0 2 3 0 1 2 3 2 3 20 2 30 )100 ( ˆ =m )00001 1101 1( ˆ =U Lecture 11 28 Example of soft-decision Viterbi decoding )101 ( ˆ =m )1 1100 0101 1( ˆ =U )101 (=m )1 1100 0101 1(=U )1, 3 2 ,1, 3 2 ,1, 3 2 , 3 2 , 3 2 , 3 2 ,1( − − −− =Z 5/3 -5/3 4/3 0 0 1/3 1/3 -1/3 -1/3 5/3 -5/3 1/3 1/3 -1/3 6 t 1 t 2 t 3 t 4 t 5 t -5/3 0 -5/3...

Ngày tải lên: 29/10/2013, 13:15