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Q12) A bandpass communication system occupies a bandwidth of 20 MHz. It achieves a data rate of 10 Mbps and a BER = Q(3.
Posted: Sun May 15, 2022 7:55 pm
by answerhappygod
- Q12 A Bandpass Communication System Occupies A Bandwidth Of 20 Mhz It Achieves A Data Rate Of 10 Mbps And A Ber Q 3 1 (55.13 KiB) Viewed 52 times
Q12) A bandpass communication system occupies a bandwidth of 20 MHz. It achieves a data rate of 10 Mbps and a BER = Q(3.5) using BPSK with amplitude levels -1 and +1. To increase the data rate the modulation method is changed to 4-ary ASK with amplitude levels - 3a, –a, +a and +3a. The baseband pulse shape, the bandwidth of the transmitted signal and channel noise power all remain unchanged. For the 4-ary ASK system, find the value of a that will yield a BER = 0.75 X Q(3.5). [4 marks) Hint: • For BPSK: BER = Q(/2E/N.). Eь . For 4-ary ASK: En 1.25a2T and BER = 0.75 XQ 1.25N.