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DATA COMMUNICATION Lecture-13
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Review of Lecture 12 Sine Waves and its Characteristics
Control of Signals Time and Frequency Domain
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Overview of Lecture 13 Composite Signals
Frequency Spectrum and Bandwidth Other Definitions of Bandwidth Digital Signals
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Composite Signals
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Frequency Spectrum and Bandwidth
Collection of all the component frequencies a signal contains Bandwidth Width of the Frequency Spectrum
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How to calculate Bandwidth?
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Example 4.8 If a periodic signal is decomposed into five sine waves with frequencies 100, 300, 500, 700, and 900 Hz, what is the Bandwidth?
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Example 4.8 Solution:
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Other Definitions of Bandwidth
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3 dB Bandwidth or Half Power Bandwidth
For the magnitude spectra of , the range of the spectrum that does not fall lower than times the max.
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Equivalent Noise Bandwidth
The width of a fictitious rectangular spectrum created to have the same power in the rectangular band as the power of the signal in positive frequencies
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Null-to-Null Bandwidth or Zero Crossing Bandwidth
If the maximum frequency in a spectrum is ,the first null above and below will be and , where is the Null-to-Null Bandwidth
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Power Bandwidth Frequency Band in which 99% of the total power resides
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Bit Interval and Bit Rate
Bit Interval (seconds) Time required to send one single bit Bit Rate (bps) Number of bits sent per second
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Bit Interval and Bit Rate
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Significant Spectrum and Significant Bandwidth
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Summary Composite Signals Frequency Spectrum and Bandwidth
Other Definitions of Bandwidth Digital Signals
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Suggested Reading Section 4.4, 4.5, 4.6
“Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan
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DATA COMMUNICATION Lecture-13
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