FORMATTING AND BASEBAND MODULATION

BLOK DIAGRAM SISTEM KOMUNIKASI DIGITAL

FORMATTING & TRANSMISSION BASEBAND SIGNAL

FORMAT SINYAL ANALOG

• Untuk mengubah bentuk gelombang analog menjadi bentuk yang kompatibel dengan komunikasi digital diperlukan tiga proses, yaitu:

1. Sampling

2. Quantization and Encoding

3. Baseband transmission

MESSAGES, CHARACTER & SYSMBOLS

SAMPLING

Domain Waktu Domain Frekuensi

ALIASING EFFECT

TEOREMA PENCUPLIKAN

• A bandlimited signal with no spectral components above fm can be determined uniquely by values sampled at uniform intervals of

• The sampling rate, is called Nyquist Rate

KUANTISASI

ENCODING (PCM)

• A uniform linear quantizer is called Pulse Code Modulation (PCM)

• PCM: Encoding the quantized signals into a digital word (PCM word or codeword)

each quantized sample is digitally encode into an l bits codeword where L in the number of quantization levels and l = log2L

CONTOH KUANTISASI

ERROR KUANTISASI

UNIFORM & NON-UNIFORM QUANTIZATION

NON-UNIFORM QUANTIZATION

STATISTICAL OF SPEECH

BASEBAND TRANSMISSION

PCM WAVEFORMS

PCM WAVEFORMS (2)

CRITERIA FOR COMPARING AND SELECTING PCM WAVEFORMS

CRITERIA FOR COMPARING AND SELECTING PCM WAVEFORMS (2)

SPECTRA OF PCM WAVEFORMS

M-ARY PULSE MODULATION

CONTOH PAM

8-ary PAM

Binary PAM

CONTOH SOAL

SOLUSI