---------------------------------------------------------------------***----------------------------------------------------------------Abstract –Orthogonal Frequency Division Multiplexing (OFDM)is the promising candidate of a multiple carrier modulation technique because it does not require equalizers. OFDM is robust in adverse channel conditions and allows a high level of spectral efficiency....

In this paper, we propose two new multiple-access schemes for downlink system based on the combination of orthogonal frequency division multiplexing (OFDM) with index modulation (IM), namely OFDM-IM. first proposed technique, namely, Index Modulation Multiple-Access (IMMA), OFDM subcarriers are divided into multiple sets and each set is assigned to a specific user, their data bits transmitted v...

In this letter, we propose layered asymmetrically clipped optical-orthogonal frequency-division multiplexing (LACO-OFDM) with index modulation (IM), i.e., LACO-OFDM-IM for optical wireless systems. classical LACO-OFDM, the spectral leakage because of out-of-band clipping harmonics increases baseband bandwidth (BB) resulting in lower efficiencies. For LACO-OFDM-IM, use IM and optimize BB by filt...

The orthogonal frequency division multiplexing is used in wireless communication due to high data rate. OFDM are robustness against multi-path fading, frequency selective fading, and narrow band interference. Wavelet analysis has strong advantages over fourier transform and also allows time-frequency domain operation with flexibility. Wavelet is applied in various fields of wireless communicati...

In this paper, a novel method called offset modulation OM-OFDM is proposed, to control the peak-to-average power ratio of an OFDM signal. The theoretical.In this paper, the authors propose such a method called offset modulation OM-OFDM. The proposed offset modulation method pdf image stamp keygen is developed in Section II.Binary Offset Carrier modulation BOC modulation is currently used in Gal...

In recent years high speed wireless data communications have increasingly been used in many application areas like Orthogonal Frequency Division Multiplexing (OFDM) .The principles of OFDM modulation have been in theory for a long time. But in recent years, this technology has crossed the limitations into the real world of modern communication systems to combat Inter-Symbol Interference (ISI) t...

Introduction The success whereby variants of multi-carrier orthogonal frequency division multiplexing (Mc-OFDM), including Mc-CDMA, have been introduced in WLAN standards such as 802.11a and g (WiFi), as well as in broadband wireless access standards such as 802.16-2004 (WiMax), has spawned the idea of extending their application to next generation single-carrier wireless cellular systems that ...

The channel capacity of some ISI channels is examined under the condition that OFDM in conjunction with QAM modulation for subcarriers and the BICM coding scheme is used. The combination of higher order modulation schemes and low rate codes yields results relatively close to the optimum possible solution, even without application of water-filling and/or bit loading. Simulations with a turbo cod...