Question

2. a. Find Eb/No and Amplitude A required to give Pb 10-5 for the following coherent digital modulation schemes if No-10-5 and time is 0.5msec i. On-Off keying (ASK), ii. BPSK, iii. BFSK and v. BPSK with a phase error of 5 deg. Consider an audio signal with spectral components limited to the frequency band 300 to 3300 Hz. Assume that the sampling rate of 8000 samples/s will be used to generate a PCM signal. The ratio of peak signal power to average quantization noise power at the output needs to be minimum of 34 dB. a. What is the minimum number of uniform quantization levels needed? b. What is the minimum number of bits required per sample? c. Calculate the bandwidth of this system (as specified by the main spectral lobe of the signal) required for the detection of such PCM signal. (Each carry 4 Marks) b. (Each carry 3 Marks)

Answer 1

2 Sam pling. Rate-G ס 8000 Somtle/sec. SNR (d e) 34-dB 34-6n1.6 ->minim um Mo o Bits per Sample. Lavel minimum no, 2 2-