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TC AM Examples - with a power efficiency of 10 the...

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Unformatted text preview: with a power efficiency of 10%, the transmitted (3.1 In aDSB—TC AM system, operating signal is given by Mt) = [A + m (0] cos (1000f) where m(t) = cos (1000 + cos (3000 2L Determine the modulation index, 1;. (8 points) b. Sketch the 513me of the transmitted signal, fit). (8 points) 0. Suppose the modulating signal m (t) is changed to a pure tone [for example, 111 (t) = B 003(100 1)], but the carrier power and power efiiciency are unchanged. What is the value of B, the amplitude of the tone? (9 points) 4-635 3001‘ ’: @ 9.. mm): 05‘0” _ m4 ,4. W: J” bal‘WU— ’WM’L” 7:, {T '1 z 1 7' p lfiil *1! , J.‘ = 7. )7“ «E.» Fs‘ 7’ m 1 ~ Pc‘l'pi '1. FL: EL 7/ / ‘75:? ”‘3- E. l l fog/7&0 ’15” ’Hvo -logo " L ,. E E” n = $151049» [En/3 70“” 2+ 7' - » v tomb 0’1 3 2 x];- :9 E) 6.5 f 0 W/‘wf ’ a B23 (15 points) in a DSBJC AM system, operating with a power efficiency of 10%, the transmitted signal is given by (Mt) = [A+m(t)] cos (1000:) where m(t) = cos (100 t) + 505 (300 t), (1) Determine the modulation index, {4, (2) Sketch the spectrum ofthe transmitted signal, ‘ a F rfl~i[l‘iz*ill] >72”; Win“?— 1 Fc'f'pj 2- Q: If: l 0 [s00 H00 9300 ,709 76-0 ‘50:» Part B: ANSWER ONLY TWO QUESTIONS 1. Shown below is the spectrum of a DSB-TC AM signal, with a carrier frequency of 1000 radians/sec Delenm‘ne (I) the wmlefarm signal $9333; (1) (6pm,), (2) the modulation index (8 p15), and (3) the power efiiciency (8 p15). - SKL~ ’4‘( (H (La ;. 9w .iflmm 7 [’0w}-4CJS/oaé‘+é(uj§zsz)l‘]Ca ...
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