Unipolar v s Bipolar Bipolair 1 puls 0

Unipolar v. s. Bipolar • Bipolair “ 1” => +puls, “ 0”=> -puls • Unipolair=> “ 1” => +puls, “ 0” => no puls Bipolar 1 0 1 1 1 0 Unipolar 31

Bipolair data signal: RZ, Manchester, NRZ 32

UNIpolar data signal: RZ, Manchester, NRZ 1 0 1 1 1 0 33

Unipolar와 bipolar 와의 관계 unipola bipola repeated 34

Manchester Biphase "1" "0" T = 0. 1 microsecond 35

NRZ random data signal spectrum, C=2. 048 MBps. O Hz. peak linear scale 2. 048 MHz 38

RZ signal 50% duty, Bipolar , 2. 048 MBps O Hz. peak Clock 2. 048 MHz Null: 2 x 2. 048 Mhz 40

Alternating Markinversion (AMI) 50% duty cycle 41

AMI 스펙트럼 50% duty cycle, 2. 048 MBps 43

AMI => HDB 3 44

Machester code의 스펙트럼 20 MHz. 0. 001 7 0 10 0 1 10 W( f 0. 0005 ) 0 3 10 7 2 10 7 1 10 7 7 2 10 7 3 10 70 f 0. 001 W( f ) 9 0. 01. 10 1 10 7 0 10 0 1 10 4 5 3 10 7 2 10 7 1 10 7 f 7 2 10 7 7 3 1046

Raised Cosine Filter 49

델타 PCM(DPCM) 64

DPCM 부호기 65

오류확률(Error Probability) • 확률 이론에 의한 시스템 성능 분석 AWGN at t=T Transmitted waveform Received waveform Down Conversion Receiving Filter Equalizing Filter Threshold Comparison 75

PDF of AWGN 76

Conditional PDF 77

Bit Error Probability(1) 78

Bit Error Probability(2) 79

Bit Error Probability(3) Ed is energy difference N 0/2 is noise spectral density is vector angle Antipodal : Orthogonal : /2 , Where, Average bit energy Correlation coefficient 80

BER 1) Coherent BPSK 2) Coherent ASK 3) Coherent BFSK 4) Non-coherent DPSK 5) Non-coherent FSK 81