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一、单边带通信及其优点我们知道,一个载波信号u_c(t)=U_(cm)cosω_ct,经过单音频信号u_Ω(t)=U_Ω_mcos Ωt调制后所得到的调幅波信号为 u(t)=(U_(cm)+U_Ω_mcosΩt)cosω_ct =U_(cm)(1+mcos Ωt)cosω_ct =U_(cm)cosω_ct+m/2U_(cm)cos(ω_c+Ω)t+m/2U_(cm)cos(cos(ω_c—Ω)t式中: U_(cm)——载波信号的振幅值;ω_c——载波信号的角频率; U Ω_m——单音频信号的振幅值;Ω——单音频信号的角频率; m——调幅系数或调幅度,m=U Ω_m/U_(cm)。
First, the single sideband communication and its advantages We know that a carrier signal u_c (t) = U_ (cm) cosω_ct, after the single audio signal u_Ω (t) = U_Ω_mcos Ωt modulation obtained after the amplitude modulation signal is u (t) = (U_ (cm) + U_Ω_mcosΩt) cosω_ct = U_ (cm) (1 + mcos Ωt) cosω_ct = U_cm cosω_ct + m / 2U_cm cos ω_c + Ω t + m / 2U_cm cos (cos (ω_c-Ω) t where: U_ (cm) - the amplitude of the carrier signal; ω_c - the angular frequency of the carrier signal; U Ω_m - the amplitude of the monophonic signal; Ω - the amplitude of the monophonic signal Angular frequency; m - amplitude modulation or amplitude modulation, m = U Ω_m / U_ (cm).