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Q5) A bandpass communication system occupies a bandwidth of 20 MHz. It achieves a data rate of 10 Mbps and a BER = Q(3.5
Posted: Sun May 15, 2022 7:55 pm
by answerhappygod
- Q5 A Bandpass Communication System Occupies A Bandwidth Of 20 Mhz It Achieves A Data Rate Of 10 Mbps And A Ber Q 3 5 1 (32.14 KiB) Viewed 37 times
Q5) 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 Q(3.5). [4 marks) Hint: • For BPSK: BER = Q(/2E/N.). Е, . For 4-ary ASK: En = 1.25a-T and BER = 0.75 XQ 1.25N = = 3 3