1) What is the minimum number of bits per sample that should be used in this PAM transmission system? 2) What is the minimum required sampling rate, and what is the resulting bit rate? 3) What is the 16-ary PAM symbol transmission rate?
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- a) i) Determine the number of bits per level required when using FSK with 4 different frequencies and QAM with a constellation of 256 points. ii) We want to digitise a signal that contains frequencies between 100 Hz and 1500 Hz, assuming 16 bits per sample. The digitised signal will be transmitted using a QPSK process. Determine the bit rate and the level rate. iii) We need to send 210,000 bits per second over a noiseless channel using 128- QAM. Determine the required bandwidth.c) ii) We want to digitise a signal that contains frequencies between 100 Hz and 1500 Hz, assuming 16 bits per sample. The digitised signal will be transmitted using a QPSK process. Determine the bit rate and the level rate.(8) A digital recording system samples cach of two stereo input signals with a 16bit ADC at 44.1k sample per second. (a) Determine the output peak SNR for a fl- scale sinusoid. (b) The bit stream of digitized data is augment by the addition of error-correcting, clock extraction, display and control bit fields. These additional bits represent 100 percent overhead. Determine the output bit rate of this system. (c) If we would like to store an hour's worth of music using this system, determine the memory size required. (d) for a comparison, a high-grade collegiate dictionary may contain 1500 pages, 2 columns per page, 100 lines per column, 8 words per line, 6 letters per word and 7 bits per letter (all on average). Determine the memory size required to store it. Solution: (a) SY R-101 Ldn
- How many 8 bits data blocks can be transmitted per second over 4800 bits/second serial Communication link using a parity synchronous mode of transmission with 1 start bit, 2 stop bits, 1 parity bit?The information in an analog waveform, whose maximum frequency fm-D4000HZ, is to be transmitted using a 16-level PAM system. The quantization must not exceed +1% of the peak-to peak analog signal. (a) What is the minimum number of bits per sample or bits per PCM word that should be used in this system? (b) What is the minimum required sampling rate, and what is the resulting bit rate? (c) What is the 16-ary PAM symbol Transmission rate?If in a PCM system, uniform quantizer having total 256 steps is being used, then what will be the number of transmitted bits per sample?
- An encoder a.Group of answer choices b.converts a binary code input to a single output c.Converts a singe input to a binary coded output d.Selects from many data sources e.Directs data to one of many data terminals(3) Five telemetry signals, each of bandwidth 1kHz, are to be transmitted simultaneously by binary PCM. The maximum tolerable error in sample amplitudes is 0.2% of the peak signal amplitude. The signals must be sampled at least 20% over the Nyquist rate. Framing and synchronizing require an additional 0.5% extra bits. Determine the minimum possible data rate that must be transmitted, and the minimum bandwidth required to transmit this signal.Q.3) You want to transmit the message &$ a. Encode this textual message into a sequence of bits, using 6-bit ASCII coding, followed by a seventh bit for error detection, per character. The seventh bit is chosen so that the total sum of bits using XNOR gate is zero How many total bits are there in the message? b. Assuming the bit duration 10 ms, plot the Dicode RZ line code. c. Assuming the bit duration = 10 ms, plot the Bi--M code. d. Assuming the bit duration 10 ms, plot the Miller line code.
- 3. Explain the aliasing in sampling and how it can be avoided.3. Some GPS receivers use 1 bit ADCS (Analog-to-digital Converters) to sample and quantize the signal i.e. the output of the ADC is simply 2 quantization levels: -1 or +1. This is typically done to save on power. (a) What is the quantization SNR? How does it compare to typical thermal noise SNR of a GPS signal before correlating with the CDMA code? (b) Justify, how come it is possible to sample the signal using a single bit and still get good performance.Explain the concept of modulation and demodulation in analog and digital data transmission.