A multicarrier architecture based upon the affine Fourier transform

Recently, innovative multicarrier schemes have been proposed that exploit the transmission of chirp-shaped waves e/sup -j2/spl pi/ct2/ by optimally choosing the chirp parameter c on the basis of the channel characteristics and are more robust to time-varying channels than ordinary OFDM schemes. This...

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Bibliographic Details
Published in:IEEE transactions on communications 2005-05, Vol.53 (5), p.853-862
Main Authors: Erseghe, T., Laurenti, N., Cellini, V.
Format: Article
Language:English
Subjects:
Affine Fourier transforms
Applied sciences
Blocking
Channels
Chirp
chirp functions
Chirp modulation
Demodulation
Demodulators
Discrete Fourier transforms
Eigenvalues and eigenfunctions
Exact sciences and technology
Fourier transforms
Information, signal and communications theory
Interchannel interference
interchannel interference suppression
Intersymbol interference
Modulation
Modulation, demodulation
Modulators
multicarrier modulations
OFDM modulation
Optimization
Robustness
Signal and communications theory
Studies
Telecommunications and information theory
Time-varying channels
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Summary:Recently, innovative multicarrier schemes have been proposed that exploit the transmission of chirp-shaped waves e/sup -j2/spl pi/ct2/ by optimally choosing the chirp parameter c on the basis of the channel characteristics and are more robust to time-varying channels than ordinary OFDM schemes. This concept was applied to continuous-time and to discrete-time systems. In the present paper, we aim at developing those ideas using the affine Fourier transform (AFT), which is a very general formulation of chirp transforms. We present a multicarrier modulation based upon the discrete form of the AFT that is therefore inherently discrete and strictly invertible. Moreover, it allows to define a circular prefix concept that is coherent with the chirp nature of the transmission. The system can be efficiently implemented by adding a simple phase-correction block to standard OFDM modulators/demodulators and can effectively combat interchannel interference when the propagation channel is made of few multipath components affected by independent frequency offsets. Our discrete-time multicarrier scheme is an improved version of Martone's approach (as we also show by simulation results), and exhibits analogous characteristics to Barbarossa's continuous-time system.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2005.847162