By Ahmad R. S. Bahai, Burton R. Saltzberg (auth.)
Multi-carrier modulation, particularly orthogonal frequency department multiplexing (OFDM), has been effectively utilized to a large choice of electronic communications functions for numerous years. even though OFDM has been selected because the actual layer regular for a variety of vital structures, the idea, algorithms, and implementation innovations stay topics of present curiosity.
This booklet is meant to be a concise precis of the current cutting-edge of the idea and perform of OFDM know-how. This ebook bargains a unified presentation of OFDM idea and excessive pace and instant purposes. specifically, ADSL, instant LAN, and electronic broadcasting applied sciences are defined.
it really is was hoping that this ebook will end up worthy either to builders of such platforms, and to researchers and graduate scholars excited by research of electronic communications, and should stay a necessary precis of the expertise, offering an realizing of latest advances in addition to the current center expertise.
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Additional info for Multi-Carrier Digital Communications: Theory and Applications of OFDM
3. G. Information Theory and Reliable Communication. New York: Wiley, 1968. 4. Kalet, I. " IEEE Trans. ; Feb 1989; 37: 119-124. 5. Feig, E. " IEEE Trans. ; Jul 1990; 38: 929-932. Performance Over Time-Invariant Channels 55 6. M. " IEEE Int. Conf. ; 1993; 756-760. 7. C. " IEEE Trans. , Feb-Apr 1995; 43: 773-775. 8. 9. , Kalet I. " IEEE Int. Conf. 2. D. " IEEE Trans. , Oct 1995; 43: 2582-2594. 10. Hughes-Hartog, D. S. S. Patent 4,833,706. 11. C. " IEEE Trans. ; Feb 1995; 43: 773-775. 1 Introduction It is widely recognized that a serious problem in OFDM is the possibility of extreme amplitude excursions of the signal.
Secondly, for DIT System Architecture 27 complex multiplication is performed before the add-subtract operation, while in DIF the order is reversed. While complexity of the two structures is similar in typical DFT, this is not the case for partial FFT . The reason is that in the DIT version of partial FFT, a sign change (multiplication by 1 and -1) occurs at the first stages, but in the DIF version it occurs in later stages. 4 Cyclic Extension Transmission of data in the frequency domain using an FFT, as a computationally efficient orthogonal linear transformation, results in robustness against ISI in the time domain.
This structure is preferred compared to the required filtering complexity in other wideband systems. 4. 4. Two different techniques for FFT butterfly. 5. In order to detect (receive) the marked point at the output, we can restrict the FFT calculation to the marked lines. Therefore, a significant amount of processing will be saved. 5. Partial FFT (DIT) Two main differences between decimation in time (DIT) and decimation in frequency (DIF) are noted . First, for DIT, the input is bit-reversed and output is in natural order, while in DIF the reverse is true.