Modulation and coding course- lecture 12

... 2007 Catharina Logothetis Lecture 12 Lecture 12 5 Soft and hard decision decoding  In hard decision:  The demodulator makes a firm or hard decision whether one or zero is transmitted and provides no ... distance.  The coding gain is upper bounded ⎣ ⎦ 2/)1( −= f dt )(log10 gain coding 10 fc dR≤ Lecture 12 23 Performance bounds …  Basic coding gain (dB) for soft-dec...

Ngày tải lên: 29/10/2013, 13:15

... Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 10 Lecture 10 2 Last time, we talked about:  Channel coding  Linear block codes  The error detection and correction ... Linear block codes  The error detection and correction capability  Encoding and decoding  Hamming codes  Cyclic codes Lecture 10 3 Today, we are going to ta...

Ngày tải lên: 25/10/2013, 06:15

... error detection and correction codes Lecture 9 7 Why using error correction coding?  Error performance vs. bandwidth  Power vs. bandwidth  Data rate vs. bandwidth  Capacity vs. bandwidth (dB) ... and correction capability  Encoding and decoding  Hamming codes  Cyclic codes Lecture 9 4 Block diagram of a DCS Format Source encode Format Source decode Channel encode Pulse modul...

Ngày tải lên: 25/10/2013, 06:15

... Modulation, Demodulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 11 Lecture 11 10 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 ...  Decoding based on soft-bits, is called the “soft-decision decoding”.  On AWGN channels, 2 dB and on fading channels 6 dB gain are o...

Ngày tải lên: 29/10/2013, 13:15

... signal  Baseband versus bandpass:  Bandwidth dilemma:  Bandlimited signals are not realizable!  Realizable signals have infinite bandwidth! Baseband signal Bandpass signal Local oscillator Lecture ... oscillator Lecture 1 25 Bandwidth of signal …  Different definition of bandwidth: a) Half-power bandwidth b) Noise equivalent bandwidth c) Null-to-null bandwidth a) Fractional power c...

Ngày tải lên: 08/11/2013, 18:15

... I: Modulation and Coding Course Period 3 – 200/ Catharina Logothetis Lecture 2 Lecture 2 10 Encoding (PCM)  A uniform linear quantizer is called Pulse Code Modulation (PCM).  Pulse code modulation ... density, random process, linear systems and signal bandwidth. Lecture 2 20 Spectra of PCM waveforms Lecture 2 21 M-ary pulse modulation  M-ary pulse modulations categor...

Ngày tải lên: 08/11/2013, 18:15

... non-uniform  Baseband modulation  Binary pulse modulation  M-ary pulse modulation  M-PAM (M-ay Pulse amplitude modulation) Lecture 3 3 Formatting and transmission of baseband signal  Information ... statistic) Baseband pulse Received waveform Step 1 – waveform to sample transformation Step 2 – decision making )(tr )(Tz i m ˆ Demodulate & Sample Detect Lecture 3 13 Baseba...

Ngày tải lên: 27/01/2014, 08:20

... Vector to waveform conversion Lecture 4 17 Example of projecting signals to an orthonormal signal space ),()()()( ),()()()( ),()()()( 323132321313 22 2122 2 2121 2 121 1121 21111 aatatats aatatats aatatats =⇔+= =⇔+= = ⇔ + = s s s ψψ ψψ ψ ψ )( 1 t ψ )( 2 t ψ ),( 121 11 aa = s ),( 22 212 aa = s ),( 32313 aa=s Transmitted ... A 0 1 s 2 s T A T A− 0 0 Tt )( 1 t ψ T 1 0 0)()()()( )()()(),( /...

Ngày tải lên: 27/01/2014, 08:20

... iEE sii s s ski Ed ki Ed 2 2 min , = ≠ = Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 5 Lecture 5 20 Eb/No figure of merit in digital communications  ... bound 1 ψ 1 s 4 s 2 s 3 s 1 Z 4 Z 3 Z 2 Z r 2 ψ 1 ψ 1 s 4 s 2 s 3 s 2 A r 1 ψ 1 s 4 s 2 s 3 s 3 A r 1 ψ 1 s 4 s 2 s 3 s 4 A r 2 ψ 2 ψ 2 ψ ∫ ∪∪ = 432 )|()( 11 ZZZ e dmpmP rr r...

Ngày tải lên: 27/01/2014, 08:20