Journal ArticleDOI
Optimal finite duration pulses for OFDM
A. Vahlin,N. Holte +1 more
- Vol. 44, Iss: 1, pp 10-14
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TLDR
Pulses of finite duration for use in orthogonal frequency division multiplexing (OFDM) using offset QAM modulation is presented and an optimization procedure which minimizes the out-of-band energy under the constraints of zero intersymbol and interchannel interference is presented.Abstract:
This paper presents pulses of finite duration for use in orthogonal frequency division multiplexing (OFDM) using offset QAM modulation. In such a system the pulses will overlap in both frequency and time without intersymbol or interchannel interference. The pulses are generated by an optimization procedure which minimizes the out-of-band energy under the constraints of zero intersymbol and interchannel interference. Low out-of-band energy is important to achieve high bandwidth efficiency, especially when the number of channels is small. The optimization procedure leads to an integral equation which is solved by expanding the pulse in truncated prolate spheroidal wave functions. Examples of optimized pulses and their spectrum are presented for lengths of 2 and 4 symbol intervals.read more
Citations
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Proceedings ArticleDOI
Optimization of the OFDM prototype waveform for highly time and frequency dispersive channels through a maximization of the SIR
TL;DR: In this paper, an optimization of the OFDM system waveform is carried as a linear combination of several of the most localized Hermite functions, done by maximizing the signal-to-interference ratio.
Book ChapterDOI
FBMC Design and Implementation
TL;DR: In this paper, effective modulation-based uniform filterbank structures are used, and the designs are defined by the low-pass prototype filter, and two alternative design approaches are considered: the first approach starts from continuous-time formulation of the prototype filter responses, which are then discretized.
Patent
Mechanism for avoiding triggering silent radio squelch circuits
TL;DR: In this paper, a smart sub-channel hopping control mechanism executes one or more subchannel selection discriminators to enable the communications controller of a spectral reuse transceiver to delineate on which of a plurality sub-channels the transceiver may transmit, so as to substantially reduce the likelihood of triggering squelch circuits of silent radios of primary (licensed) channel users.
Advanced mathematical models for the design and optimization of low-interference wireless multicarrier systems
TL;DR: This work considers the application of frame theory and related mathematical models to pulse-shaping MC systems transmitting over doubly dispersive fading channels and proposes pulse optimization procedures that minimize interference by exploiting the design freedom existing for redundant MC systems.
Journal ArticleDOI
Inter carrier interference and signal to interference ratio of various pulse shaping functions used in ofdm system with carrier frequency offset
TL;DR: Detailed performance comparison of various pulse shaping functions used in OFDM System with Carrier Frequency Offset show that the performance improvement over conventional pulse shapes, are significant for reducing average intercarrier-interference (ICI) power and increased ratio of average signal power to average ICI power (SIR).
References
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Journal ArticleDOI
Multicarrier modulation for data transmission: an idea whose time has come
TL;DR: The general technique of parallel transmission on many carriers, called multicarrier modulation (MCM), is explained, and the performance that can be achieved on an undistorted channel and algorithms for achieving that performance are discussed.
Journal ArticleDOI
Prolate spheroidal wave functions, fourier analysis and uncertainty — II
David Slepian,H. O. Pollak +1 more
TL;DR: In this paper, the authors apply the theory developed in the preceding paper to a number of questions about timelimited and bandlimited signals, and find the signals which do the best job of simultaneous time and frequency concentration.
Journal ArticleDOI
Synthesis of band-limited orthogonal signals for multichannel data transmission
TL;DR: A principle of orthogonal multiplexing for transmitting a number of data messages simultaneously through a linear band-limited transmission medium at a maximum data rate without interchannel and intersymbol interferences is presented.
Journal ArticleDOI
Performance of an Efficient Parallel Data Transmission System
TL;DR: A parallel quadrature AM data transmission system with a number of overlapping channels, each carrying a signaling rateb, spacedb/2apart in frequency appears to be a promising technique for achieving good performance at high information rates over bandlimited dispersive transmission media.