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OFDM for Underwater Acoustic Communications by Zhaohui Wang, Shengli Zhou

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Chapter 2OFDM Basics

We illustrate the basic ideas of OFDM transmission and reception in a time invariant channel c02-math-0001. Assume that c02-math-0002 has nonzero support within the interval c02-math-0003. The channel frequency response is expressed as

2.1 equation

Denote c02-math-0005 as the transmitted passband signal. The received passband signal after channel transmission is

where c02-math-0007 is the additive noise.

Given the dispersive nature of the channel, intersymbol interference appears for serially transmitted data streams. Compared to the canonical single-carrier serial transmission scheme, OFDM is a block transmission scheme, which partitions information symbols into blocks, and a guard interval is inserted between consecutive blocks before transmission. There are two different types of guard intervals: one is padding zeros at the end of ...

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