A detail analysis of the performance of an orthogonal frequency division multiplexing (OFDM) transmission with different digital modulation techniques such as BPSK, QPSK and QAM has been carried out. BER performance has been determined for Additive white Gaussian Noise (AWGN) channel. The simulation results for the performance of OFDM using different digital modulation schemes BPSK, QPSK and QA...

Orthogonal frequency Division Multiplexing (OFDM) is a type of multicarrier modulation technique (MCM) in which higher data stream is divided into a number of lower data streams and transmitted over a large number of subcarriers. Various digital modulations techniques can be combined with OFDM for enhancing the performance of OFDM system. This paper focuses the MATLAB simulink model of BPSK, QP...

In this letter, we propose a novel modulation concept which call index and composition (ICM). the proposed concept, use indices of active/deactive codeword elements compositions an integer to encode information. regard, first determine activated elements, then exploit energy levels these identify compositions. We depict practical scheme for using ICM with orthogonal frequency division multiplex...

In this paper we propose an energy efficient OFDM transmission scheme. Two CPM (continuous phase modulation) schemes are introduced to OFDM, keeping in view the constant envelope and continuous phase changing nature of CPM modulation. Energy efficiency of the proposed scheme is investigated by simulating peak to average power ratio (PAPR), and is compare with the conventional OFDM scheme. The i...

Orthogonal frequency division multiplexing (OFDM) as a modulation technology, it transmit over both wireless and optical channel, and it distribute the data over a large number of subcarrier can be overlapping. It achieved RF signal for the long haul transmission using RoF system. The RoF (Radio over Fiber) system is referred to increase the high orthogonality of the OFDM modulation signal for ...

This work presents a study of the Fractional Fourier Transform (FrFT) modulation scheme for Multiple Input Multiple Output (MIMO) multicarrier systems. Two forms of FrFT modulation techniques were observed; one involved the FrFT-OFDM implementation style with cyclic prefix, while the other precludes the FrFT following some established logical signal processing justifications. Then, both were co...

A detailed analysis of the performance of 2×2 Multiple Input Multiple Output (MIMO) antenna system has been carried out by determining the transmit diversity using Orthogonal Frequency Division Multiplexing (OFDM) techniques. The transmission characteristics are determined for BPSK, QPSK and 16-QAM modulation. Additive White Gaussian Noise (AWGN) has been used presuming flat fading Rayleigh cha...

In this paper, it is proposed to enhance coherent optical orthogonal frequency-division multiplexing (OFDM) system by using index modulation in terms of bit error rate (BER) and spectral efficiency for different levels the fiber nonlinearity. OFDM with (CO-OFDM-IM), information conveyed not only through activated subcarriers but also indices active subcarrier that are dynamically updated at tra...

Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude Modulation (OFDM/OQAM) is a multicarrier modulation scheme that can be considered as an alternative to the conventional Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) for transmission over multipath fading channels. In this paper, we investigate the combination of the OFDM/OQAM with Multiple I...

Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude Modulation (OFDM / OQAM) is a multicarrier modulation scheme that can be considered as an alternative to the conventional Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) for transmission over multipath fading channels. In this paper, we investigate the combination of the OFDM/OQAM with Alamouti...