Abstract: In this paper, a theoretical BER analysis of orthogonal frequency division multiplexing combined with time division multiplexing (OFDM/TDM) is presented for joint use of space-time transmit diversity (STTD) and receive antenna diversity with minimum mean square error (MMSE) frequency-domain equalization (FDE). The conditional BER expression is derived, based on a Gaussian approximatio...

Power amplifiers (PAs) are inherently nonlinear elements and digital predistortion is a highly cost-effective approach to linearize them. Although most existing architectures assume that the PA has a memoryless nonlinearity, memory effects of the PAs in many applications ,such as wideband code-division multiple access (WCDMA) or orthogonal frequency-division multiplexing (OFDM), can no longer b...

Tone Reservation (TR) is one of the well-known methods for PAPR reduction of Orthogonal Frequency Division Multiplexing (OFDM) systems. In this method some sub-carriers are reserved for PAPR reduction and the symbols in these sub-carriers are selected such that the PAPR of the OFDM frame is minimized. In this paper, the iterative algorithm introduced earlier for TR method in single antenna OFDM...

<span>Free space optics (FSO) is a fast-growing technology that outperforms fiber in communication network infrastructure without spectrum licensing. The goal of this work to evaluate the performance FSO system using direct detection 4-quadrature amplitude modulation (4-QAM) and 4-phase shift keying (4-PSK) with orthogonal frequency division multiplexing (OFDM) scheme. Simulating OFDM-FSO...

In current cellular networks, Spatial Modulation with Orthogonal Frequency Division Multiplexing (SM OFDM) is a newly designed transmission method that substitutes Multiple Input Output (MIMO) OFDM transmission. practical frameworks, estimation of the channel vital for recovering transmitted data. conventional DFT-based algorithm, impact noise reduced in time domain. It retains significant valu...