ece4305_L22

ece4305_L22 - Waterlling ECE4305: Software-Dened Radio...

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Waterfilling ECE4305: Software-Defined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 22 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis
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Waterfilling Multicarrier Concept Revisited Waterfilling Formulation Advantages of Multicarrier Modulation I Recall from Lecture 15 the following advantages of multicarrier modulation: I Multicarrier transmission not as severely affected by delay spread of channel I Due to longer symbol periods T mc I Channel dispersion in single carrier transmissions much greater than T sc I Separate subbands of the multicarrier scheme can more readily handle frequency-selective fading using “divide-and-conquer” approach I Simple equalization techniques applied per transmission band I Single carrier schemes usually require very complex equalization techniques to undo effects of channel I Multicarrier transmission suitable for high data rate communications due to its high robustness to error I Employed widely in numerous communication standards I Examples include: DSL modems, WiFi, WiMAX Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis
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Waterfilling Multicarrier Concept Revisited Waterfilling Formulation Multicarrier Transmission Adaptive Bit Demultiplexer Subcarrier Modulation () xn 0 yn (1) (1 ) N N N N 0 gn ) N Σ s n 0 dn ) N Figure: Schematic of a Generic Multicarrier Transmitter.
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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_L22 - Waterlling ECE4305: Software-Dened Radio...

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