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Lecture_6a - Signal Transmission Lecture 6a(basic concepts...

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Elec 300u Slide 1 Signal Transmission Lecture 6a (basic concepts) transmission systems modulation, demodulation, filtering frequency division multiplexing heterodyne and homodyne receivers Some content taken with permission from material developed for the course EECS6.02 by C. Sodini, M. Perrot and H. Balakrishnan
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2 Transmission Systems Analog Communications Information is from an analog source Signal waveform changes according to information content Fidelity is usually defined in terms of SNR. Digital Communications Information is from a digital source or a digitized analog signal Signal is made up of discrete symbols selected from a finite set (e.g., binary data). Fidelity or accuracy is specified in terms of bit error rate (probability of making a bit error).
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Modulation, Slide 3 Signal Transmission In a communications system signals or messages need to be transmitted from one place to another We say the signals are passed through a channel (e.g. free space, copper wires, optical fibers) We call this signal transmission Channels operate only at certain frequencies and suffer from distortion, interference and noise In the previous lectures we assumed the channel was a simple direct connection Elec 300u Channel
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