emlab modeling of digital communication systems using simulink chap.13 simulink examples 13.3 spread...
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DESCRIPTION
EMLAB Spread Spectrum Simulink Model without In-Band Interference (cont’d) Received signal – BPSK Demodulated signal Transmitted signal Transmitted signal – BPSK Modulated signal Transmitted signal – BPSK Spread Spectrum signal AWGN 에서 BPSK 의 이론적 에러율을 계산해보면 (E b /N 0 =3dB 일 때 ) 에러 개수를 100 개로 제한하고, E b /N 0 =3dB 일 때 시뮬레이션 한 결과는 → 차이가 거의 없음 → spreading 이 BER 특성에 미 치는 영향이 없음.TRANSCRIPT
EMLAB Modeling of Digital Communication Systems using Simulink Chap.13 Simulink Examples 13.3 Spread Spectrum 13.4 Antenna Nulling EMLAB 1 AWGN spread spectrum BPSK 13.3 Spread Spectrum Spread Spectrum Simulink Model without In-Band Interference BPSK signal; sampling time: 1s Spread spectrum; sampling time: 0.1s EMLAB Spread Spectrum Simulink Model without In-Band Interference (contd) Received signal BPSK Demodulated signal Transmitted signal Transmitted signal BPSK Modulated signal Transmitted signal BPSK Spread Spectrum signal AWGN BPSK (E b /N 0 =3dB ) 100 , E b /N 0 =3dB spreading BER . EMLAB 3 Spread Spectrum Simulink Model with In-Band Interference 1kHz, 1V p_p, 30V p_p Spread spectrum; sampling time: 0.01s, 0.001s EMLAB 4 Spectrum Analyzer Spread Spectrum Simulink Model with In-Band Interference (contd) Spread Spectrum BPSK : 1V p_p EMLAB Spread Spectrum Simulink Model with In-Band Interference (contd) Transmitted Signal: 100 chips/bit Despread Signal: 100 chips/bit : 1V p_p EMLAB Spread Spectrum Simulink Model with In-Band Interference (contd) Transmitted Signal: 1000 chips/bit Despread Signal: 1000 chips/bit EMLAB Spread Spectrum Simulink Model with In-Band Interference (contd) Transmitted Signal: 1000 chips/bit Despread Signal: 1000 chips/bit BPSK Spread Spectrum signal Spread Spectrum signalTransmitted Signal Before BPSK Modulated Received Signal BPSK Despread EMLAB Spread Spectrum Simulink Model with In-Band Interference (contd) : 60V p_p Transmitted Signal: 100 chips/bit Received Signal: 100 chips/bit EMLAB 9 RLS Spread Spectrum Simulink Model with In-Band Interference and Excision filter length=32, forgetting factor=1, initial input variance=0.1 EMLAB 10 : 60V p_p, RLS filter Spread Spectrum Simulink Model with In-Band Interference and Excision (contd) Received Signal: 100 chips/bit RLS EMLAB Antenna Nulling EMLAB Antenna Nulling (contd) EMLAB 13 13.4 Antenna Nulling (contd) EMLAB 13.4 Antenna Nulling (contd) 14 S/I = 0dB EMLAB 15 13.4 Antenna Nulling (contd) EMLAB 16 S/I = 0dB, 10dB Antenna Nulling (contd)