This contribution presents low computational complexity versions of orthogonal frequency division multiplexing (OFDM) modulation scheme for the implementation of clustered-OFDM systems for data transmission in the pass band frequency. Among the proposed schemes, which are named Hermitian symmetric OFDM (HS-OFDM) I and HS-OFDM II, the HS-OFDM II can offer computational complexity reduction in co...

Polar coded grayscale image communication over additive white Gaussian noise (AWGN) channels using orthogonal frequency division multiplexing (OFDM) system is demonstrated in this paper. The OFDM technique is effective multicarrier technique used in the high-speed transmission system. Polar codes are recently applied to the binary memoryless channel and binary erasure channels for achieving nea...

This paper analyzes performance and throughput of an adaptive bit allocation and variable rate algorithm depending on channel state information (CSI) and a transmit power in a multi-user OFDM transmission. The purpose of the presented multi-rate OFDM system using adaptive modulation is to increase bandwidth efficiency by controlling constellation size and to adapt proper service for each user a...

We successfully demonstrate a novel enhanced asymmetrically clipped optical OFDM (eACO-OFDM) solution over a PON link. The proposed technique doubles the spectral efficiency of conventional ACO-OFDM at the expense of a slight increase in complexity. OCIS codes: (060.2330) Fiber optics communications; (060.4080) Modulation.

We propose a novel offset-QAM OFDM scheme to improve the dispersion tolerance to that of one subcarrier without cyclic prefix. This scheme exhibits greatly enhanced spectral efficiency compared to CP-OFDM and lower complexity than RGI-OFDM. OCIS codes: (060.2330) Fiber optics communications; (060.4080) Modulation.

Optical spatial modulation (OSM) is a multiple-transmitter technique that can provide higher data rates with low system complexity as compared to single-input singleoutput (SISO) systems. Orthogonal frequency division multiplexing (OFDM) is widely implemented to achieve better spectral efficiency in wireless channels. Asymmetrically clipped optical OFDM (ACO-OFDM) and DC-biased optical OFDM (DC...

OFDM is one of the most widely used multi-carrier modulation technologies in wireless communication. However, case high mobility, orthogonality between sub-carriers destroyed due to existence time selective fading, and performance system greatly affected. In order reduce this effect, data can be pre-coding before modulation. The technique adopted paper Walsh-Hadamard transform (WHT). are distri...

Introduction: Orthogonal-frequency-division-multiplexing (OFDM) is a special form of multicarrier modulation where a single data stream is transmitted over a number of lower rate orthogonal subcarriers [1]. Such a format has been widely implemented in various digital communication standards. Recently we proposed an equivalent optical multicarrier modulation format, called coherent optical OFDM ...

Optical Orthogonal Frequency-Division Multiplexing (O-OFDM) is eminently suitable for mitigating the multi-path and chromatic dispersion in both Visible Light Communications (VLC) Fiber Communications. We commence our discourse by surveying conception historic evolution of O-OFDM designed VLC optical fiber, culminating birth its most flexible design alternative, namely Layered Asymmetrically Cl...

Orthogonal frequency division multiplex/offset QAM (OFDM/OQAM) and N-continuous OFDM are both improved multi-carrier modulation (MCM) techniques for the transmission of signals over multipath fading channels. In this paper, we aim to compare these two techniques with respect to out-of-band radiation, bit error ratio (BER) and calculation complexity. Analysis and simulation results show that, co...