A satellite allocates a frequency band from 930 MHz to 980 MHz for transmission of digitized signals. Multiple audio signals, each made up of 2 stereo channels with a highest frequency of (N+3) kHz, must be sampled at 1,6x the minimum alias-free rate and digitized with 10-bit accuracy. The resulting PCM signals must then be combined by TDM and transmitted from the satellite using QAM modulation of a single carrier. (a) What bit rate is required for a single audio signal? (b) If minimum-bandwidth pulses are used to carry the data, what is the maximum symbol rate allowed by the allocated bandwidth? (c) If 64-QAM format is used, what is the maximum bit rate that can be transmitted? (d) If 64-QAM format is used, what is the largest number of audio signals that can be supported? (c) If noise is found to create excessive bit errors, choose a format other than 64-QAM that should do better, and find the largest number of audio signals that can be sent with your chosen format.
A satellite allocates a frequency band from 930 MHz to 980 MHz for transmission of digitized signals. Multiple audio signals, each made up of 2 stereo channels with a highest frequency of (N+3) kHz, must be sampled at 1,6x the minimum alias-free rate and digitized with 10-bit accuracy. The resulting PCM signals must then be combined by TDM and transmitted from the satellite using QAM modulation of a single carrier. (a) What bit rate is required for a single audio signal? (b) If minimum-bandwidth pulses are used to carry the data, what is the maximum symbol rate allowed by the allocated bandwidth? (c) If 64-QAM format is used, what is the maximum bit rate that can be transmitted? (d) If 64-QAM format is used, what is the largest number of audio signals that can be supported? (c) If noise is found to create excessive bit errors, choose a format other than 64-QAM that should do better, and find the largest number of audio signals that can be sent with your chosen format.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Quantization and Resolution
Quantization is a methodology of carrying out signal modulation by the process of mapping input values from an infinitely long set of continuous values to a smaller set of finite values. Quantization forms the basic algorithm for lossy compression algorithms and represents a given analog signal into digital signals. In other words, these algorithms form the base of an analog-to-digital converter. Devices that process the algorithm of quantization are known as a quantizer. These devices aid in rounding off (approximation) the errors of an input function called the quantized value.
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Transcribed Image Text:A satellite allocates a frequency band from 930 MHz to 980 MHz for transmission of digitized audio
signals. Multiple audio signals, each made up of 2 stereo channels with a highest frequency of (N+3) kHz,
must be sampled at 1.6x the minimum alias-free rate and digitized with 10-bit accuracy. The resulting PCM
signals must then be combined by TDM and transmitted from the satellite using QAM modulation of a
single carrier.
(a) What bit rate is required for a single audio signal?
(b) If minimum-bandwidth pulses are used to carry the data, what is the maximum symbol rate allowed
by the allocated bandwidth?
(c) If 64-QAM format is used, what is the maximum bit rate that can be transmitted?
(d) If 64-QAM format is used, what is the largest number of audio signals that can be supported?
(c) If noise is found to create excessive bit errors, choose a format other than 64-QAM that should do
better, and find the largest number of audio signals that can be sent with your chosen format.
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