Interference Analysis of Filtered Multitone Modulation Over Time-Varying Frequency- Selective Fading Channels

We consider in this paper filtered multitone (FMT) modulation over frequency-selective time-varying fading channels. Due to the phase and amplitude distortion introduced by the fading channel, not only is the orthogonality among different subcarriers destroyed, but also the perfect Nyquist sampling...

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Bibliographic Details
Published in:IEEE transactions on communications 2007-04, Vol.55 (4), p.717-727
Main Authors: Tiejun Wang, Proakis, J.G., Zeidler, J.R.
Format: Article
Language:English
Subjects:
Analysis of variance
Applied sciences
Baseband
Carrier-to-interference (C/I) ratio
Channels
Communication channels
Communication systems
Detection, estimation, filtering, equalization, prediction
Distortion
Exact sciences and technology
Fading
filtered multitone (FMT)
Frequency modulation
Information, signal and communications theory
Interchannel interference
interchannel interference (ICI)
Interference
Intersymbol interference
intersymbol interference (ISI)
Matched filters
Modulation
Modulation, demodulation
orthogonal frequency-division multiplexing (OFDM)
Phase distortion
Sampling
Sampling methods
Sampling, quantization
Signal analysis
Signal and communications theory
Signal, noise
Spectra
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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Summary:We consider in this paper filtered multitone (FMT) modulation over frequency-selective time-varying fading channels. Due to the phase and amplitude distortion introduced by the fading channel, not only is the orthogonality among different subcarriers destroyed, but also the perfect Nyquist sampling condition of the baseband matched filters is no longer valid. Consequently, interchannel, as well as intersymbol, interference will cause distortions to the transmitted signals. In this paper, the interference caused by the channel frequency selectivity and time variance is quantified by analyzing the demodulated signals at the receiver under several different fading-channel conditions. An analysis of the average carrier-to-interference (C/I) ratio of the FMT system is provided in order to demonstrate the underlying tradeoff between spectral efficiency and system performance. For comparison purposes with other multicarrier communication systems (or modulation techniques), the C/I ratio of the conventional orthogonal frequency-division multiplexing system is also provided and compared with that of the FMT system under the same channel conditions and spectral efficiency. Finally, numerical and simulation results are given that confirm the C/I ratio results obtained
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2007.892455