ece4305_L15

ece4305_L15 - Multicarrier Modulation Fundamentals ECE4305:...

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Multicarrier Modulation Fundamentals ECE4305: Software-Defined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 15 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis
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Multicarrier Modulation Fundamentals Motivation Multicarrier Implementation Repackaging Information I Information can be transmitted using a variety of techniques I Manipulate dimensions of time, frequency, and space I The choice of technique depends on the desired performance outcome of the communication system I If you want a data transmission scheme that possesses a low probability of interference, low probability of detection, and immunity to narrowband jamming Spread Spectrum I If you want a data transmission scheme that possesses a high level of error robustness in dispersive environments and has high data rates Multicarrier Modulation I In most cases, the amount of information that can be transmitter remains constant given constraints on the total amount of available bandwidth and transmit power Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis
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Multicarrier Modulation Fundamentals Motivation Multicarrier Implementation Symbol Period Versus Bandwidth I One of the key mathematical relationships in digital communications is between the symbol period T and the signal bandwidth B , defined as B = 1 T I Fundamental engineering trade-off between symbol period and signal bandwidth I If the number of bits of information are kept constant over one symbol period, then a shorter the symbol period will yield a higher overall data rate I
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This note was uploaded on 01/13/2011 for the course ECE 4305 taught by Professor Wy during the Spring '10 term at WPI.

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ece4305_L15 - Multicarrier Modulation Fundamentals ECE4305:...

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