Modulation and coding course- lecture 12
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
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Lecture 12 23
Performance bounds …
Basic coding gain (dB) for soft-dec...
Modulation and coding course- lecture 10
... 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...
Modulation and coding course- lecture 9
... 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...
Modulation and coding course- lecture 11
... Modulation, Demodulation and
Coding Course
Period 3 - 2007
Catharina Logothetis
Lecture 11
Lecture 11 10
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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...
Modulation and coding course- lecture 1
... 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...
Modulation and coding course- lecture 2
... 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...
Tài liệu Modulation and coding course- lecture 3 pptx
... 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
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Baseband pulse
Received waveform
Step 1 – waveform to sample transformation
Step 2 – decision making
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Lecture 3 13
Baseba...
Tài liệu Modulation and coding course- lecture 4 pdf
... Vector to waveform conversion
Lecture 4 17
Example of projecting signals to an
orthonormal signal space
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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
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