Journal ArticleDOI
Optimal finite duration pulses for OFDM
A. Vahlin,N. Holte +1 more
- Vol. 44, Iss: 1, pp 10-14
Reads0
Chats0
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
More filters
Book ChapterDOI
Implementation of Multicarrier Systems with Polyphase Filterbanks
TL;DR: This article will emphasize on how to efficiently implement multicarrier (MC-) systems different from and alternative to OFDM and show that when using polyphase filterbanks to do so this is a little complex and flexible solution.
Dissertation
Carrier Synchronization in OFDM without Use of Pilots
TL;DR: In this article, a carrier frequency offset (CFO) between transmitter and receiver is proposed to obtain the orthogonality between subchannels in OFDM systems, with the assumption that the carrier frequency at the receiver is known.
Proceedings ArticleDOI
Sidelobe suppression with orthogonal projection for OFDM systems: Performance characterization
TL;DR: This paper provides comprehensive performance analysis for the zero-forcing receiver for the SSOP scheme, showing the independence of the orthogonal projection matrix on the ordering of the suppression distances, and the monotonicity of the SNR with the suppression distance and the number of reserved subcarriers.
Journal ArticleDOI
Sparse approximation based resource allocation in DMT transmitters with per-tone pulse shaping
TL;DR: An algorithm to optimally allocate the available resources, i.e., power and filter taps, under PSD mask constraints, is presented, based on a dual problem formulation, which achieves a high performance with relatively low complexity, which is also demonstrated by simulations.
Analysis and design of pilot-aided multicarrier systems over doubly selective channels with a local subcarrier processing constraint
TL;DR: This approach provides a new framework within which the performance limits of practical reception strategies with processing complexity constraints can be characterized and compared to optimal reception for any MCM scheme.
References
More filters
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.