It is problem about digital communication system.(You dont need to solve 4-6. Ju

Question

It is problem about digital communication system.(You dont need to solve 4-6. Just please 4-7)

9,600,-bit/s transmission over, a telephone line is desired. For this purpose the line must be specially, conditioned to allow signal transmission over the range 300 to 3,000 Hz,. Show that instate QAM, with 12.5-percent sinusoidal roll-off shaping, will provide the desired bit rate. The carrier is chosen in the center of the band at 1,650 Hz. Show that the 6-dB bandwidth about the carrier is 2,400 Hz. Refer to Prob, 4-6, 14.4-. and 19.2-kbit/s modems are to be used for transmission over the same telephone, line. Indicate what QAM constellations would be required for each. Determine, the, percentage of roll-off shaping required. What earner frequency(yes) would be required?

Explanation / Answer

216/3000=12.5full percenage

6 =20log f

f= 2400

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