Journal ArticleDOI
Nonorthogonal pulseshapes for multicarrier communications in doubly dispersive channels
Werner Kozek,Andreas F. Molisch +1 more
TLDR
This work derives the expected intersymbol/interchannel interference of such a nonorthogonal FDM (NOFDM) system under the assumption of a wide-sense stationary uncorrelated scattering (WSSUS) channel and compares OFDM and NOFDM schemes with regard to robustness against delay/Doppler spread.Abstract:
A new approach to multicarrier digital communication over time-varying, frequency selective fading channels is presented. We propose a transmission signal set whose basic structure is similar to standard orthogonal frequency division multiple access (OFDM)-setups, i.e., a system of functions generated by time and frequency-shifted versions of a pulse-like prototype function known as a Weyl-Heisenberg (WH) system. Unlike previous OFDM studies, however, which are restricted to the case of orthonormal pulses, we consider nonorthogonal pulses that are adapted to realistically available a priori knowledge of the channel. Perfect transmultiplexing in the case of an ideal channel is incorporated as a mathematical side-constraint. We derive the expected intersymbol/interchannel interference of such a nonorthogonal FDM (NOFDM) system under the assumption of a wide-sense stationary uncorrelated scattering (WSSUS) channel. Based on this result, we compare OFDM and NOFDM schemes with regard to robustness against delay/Doppler spread.read more
Citations
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Journal ArticleDOI
OFDM Versus Filter Bank Multicarrier
TL;DR: It is shown that filter bank multicarrier (FBMC) could be a more effective solution to the shortcomings of orthogonal frequency division multiplexing in certain applications and in other applications.
Journal ArticleDOI
Compressed Channel Sensing: A New Approach to Estimating Sparse Multipath Channels
TL;DR: In this article, the authors formalize the notion of multipath sparsity and present a new approach to estimate sparse (or effectively sparse) multipath channels that is based on some of the recent advances in the theory of compressed sensing.
Journal ArticleDOI
Interference Cancellation and Iterative Detection for Orthogonal Time Frequency Space Modulation
TL;DR: This paper derives the explicit input–output relation describing OTFS modulation and demodulation (mod/demod) and analyzes the cases of ideal pulse-shaping waveforms that satisfy the bi-orthogonality conditions and those which do not.
Journal ArticleDOI
6G Wireless Systems: Vision, Requirements, Challenges, Insights, and Opportunities
Harsh Tataria,Mansoor Shafi,Andreas F. Molisch,Mischa Dohler,Henrik Sjöland,Fredrik Tufvesson +5 more
TL;DR: This work rigorously discusses the fundamental changes required in the core networks of the future, such as the redesign or significant reduction of the transport architecture that serves as a major source of latency for time-sensitive applications.
References
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Journal ArticleDOI
Characterization of Randomly Time-Variant Linear Channels
TL;DR: Several new canonical channel models are derived in this paper, some of which are dual to those of Kailath, and a model called the Quasi-WSSUS channel is presented to model the behavior of such channels.