In this paper we investigate the deployment of filtered multitone (FMT) modulation over in-home wireless channels. We propose the adaptation of parameters (overhead factor) to the channel condition. Optimal and sub-optimal approaches are described. Comparisons with orthogonal frequency division multiplexing (OFDM) show that FMT provides significant improvements both in single user and multi use...

In orthogonal frequency division multiplexing (OFDM) system, high peak-to-average power ratio (PAPR) is the main drawback. In this paper, a Weighted Mean scheme is proposed to reduce the high peakto-average power ratio of the discrete OFDM signal without difficulty in removing the mean weight at the receiver section. In the proposed scheme, Weighted Mean scheme is imposed on every two successiv...

AbstractLong haul transmission links evolve with the advent of new multiplexing and modulation schemes. We propose a new approach of dispersion compensated coherent optical orthogonal frequency division multiplexing scheme which is combined with quadrature amplitude modulation to double the data rate and spectral efficiency as transmitted in an optical OFDM system. Quadrature amplitude modulati...

Orthogonal frequency division multiplexing (OFDM) is a special case of multicarrier transmission, where a single data stream is transmitted over a number of lower rate subcarriers. Orthogonal frequency division multiplexing (OFDM) has been chosen as modulation technique for different application wireless communications. OFDM can provide large data rates with sufficient robustness to radio chann...

This study presents, design of modified R2MDC with pipelined Technique. Radix-2 Multipath Delay commutators is the one type of Radix-2 FFT. Wireless networks have found a significant place in the growing technologies. Orthogonal Frequency Division Multiplexing (OFDM) is a key technique used in wireless networks for high speed operation, high data capacity and spectral efficiency. The Fast Fouri...

This letter presents and analyzes orthogonal frequency-division multiplexing (OFDM)-based multi-carrier transmission for cell-free massive multi-input multi-output (CFmMIMO) over frequency-selective fading channels. Frequency-domain conjugate beamforming, pilot assignment, user-specific resource allocation are proposed. The CFmMIMO-OFDM system is scalable to serve a number of users flexible off...

Multiple-input multiple-output spatial multiplexing (MIMO-SM) ultrawideband (UWB) systems with orthogonal frequency division multiplexing (OFDM) signaling are developed. It is shown that the proposed linear and nonlinear receivers offer substantial spatial diversity beside data rate enhancement.

Orthogonal Frequency Division Multiplexing (OFDM) is a well-known modulation technique for transmission of large amount of digital data with high data rate in both wired and wireless communication systems. High peak-to-average power ratio (PAPR) is the main problem of OFDM system which can be improved by using single carrier frequency division multiple access (SC-FDMA) technique. The simulation...

Wavelet Packet Modulation (WPM) is a multicarrier modulation technique like the well established Orthogonal Frequency Division Multiplexing (OFDM). It has several advantages over OFDM, such as flexibility of operation and excellent localization in frequency. The Channel Equalization for WPM is new and an unexplored research area. It is also different from equalization for OFDM because WPM symbo...

This paper addresses OFDM (orthogonal frequency division multiplexing) transmission over optical links with high spectral efficiency, i.e. by using high-order QAM-modulation schemes as a mapping method prior to the OFDM multicarrier representation. Here we address especially coherent optical OFDM modem in long distance. Numerical simulations of the coherent optical orthogonal frequency division...