ece4305_L18

ece4305_L18 - Cyclic Extension and Bit Allocation ECE4305:...

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Unformatted text preview: Cyclic Extension and Bit Allocation ECE4305: Software-Defined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 18 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Cyclic Extension and Bit Allocation Cyclic Extension Bit Allocation What is a Cyclic Extension? I It is essentially a copy of the last R samples of a symbol that are added to the beginning of the symbol to serve as a buffer against channel dispersion I This is needed to keep successive blocks of transmitted information separate from one another to allow demodulation Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Cyclic Extension and Bit Allocation Cyclic Extension Bit Allocation ISI Due to Multipath Propagation p 1 p 2 p 3 Tx Rx Figure: Example of Indoor Multipath Propagation. Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Cyclic Extension and Bit Allocation Cyclic Extension Bit Allocation Cyclic Prefix Inclusion Symbol M-1 CP Symbol M CP Symbol M+1 CP } } } n Figure: Add Cyclic Prefix to an OFDM Symbol. Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Cyclic Extension and Bit Allocation Cyclic Extension Bit Allocation Capturing ISI E ects...
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ece4305_L18 - Cyclic Extension and Bit Allocation ECE4305:...

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