Download - Sinyal Telekomunikasi
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SINYAL TELEKOMUNIKASI
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Berdasarkan pada nilai sepanjang waktu sinyal
dibagi :
Sinyal analog
Sinyal Diskrit
Sinyal digital
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ANALOG
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DISKRIT
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DIGITAL
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KARAKTERISTIK SINYAL
Domain Waktu
Domain Frekuensi
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FREKUENSI DOMAIN
Bentuk Sinyal kompleks merupakan
dekomosisi dari sinyal diskrit atau sinusoida.
Sinyal kompleks dapat dianalisa dengan
Analisis Fourier
Fourier :
Dc komponen
Komponen dasar
Frekuensi harmonis
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SINYAL KOMPLEKS DOMAIN WAKTU
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DOMAIN FREKUENSI
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CONTOH PRAKTIS
Sinyal Audio
Sinyal Music
Sinyal Video
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KARAKTERISTIK KANAL KOMUNIKASI
Membawa informasi dari Tx ke Rx
Sinyal tanpa mengalami distorsi
Dibatasi oleh bandwidth dan gangguan (noise)
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Bandwidth /Lebar frekuensi
Untuk karakteristik frekuensi jaringan telephon
pada lokal loop 0,3 – 3,4 kHz.
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GANGGUAN KANAL/NOISE
Gangguan dari luar (External Noise) Tergantung pada kondisi listrik alam
Buatan manusia
Gangguan dari dalam (Internal Noise)Ditimbulkan oleh komponen-komponen sirkit
Thermal noise (Johnson noise)
Daya Noise : P = kT Δfdimana k = konstanta Boltzmann = 1.38 x 10-23J/K
T = 0C + 273 K
Δf = bandwidth dalam Hz
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AWGN
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Cross Talk / Cakap silang
Jenis Noise yang muncul pada hubungan
parasit diantara kabel yg berbeda
Disebabkan
Isolator kurang sempurna
Saluran tidak balans
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AKUMULASI
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KUALITAS KOMUNIKASI
Baik 35 – 45 dB
Telephon tidak kurang dari 30 dB (dianggap
baik)
Saluran kanal pada umumnya 39 dB