In general, for wireless communication systems, Multiple-Input-Multiple-Output and orthogonal frequency division multiplexing (MIMO-OFDM) systems provide high spectral efficiency. However, they have a major drawback of high PAPR which results in inefficient use of a power amplifier and also improper detections. Now a days, in wireless communication systems, channel estimation is mandatory for h...

Multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM), confirmed as an efficient technique, has been applied in optical wireless communications (OWCs) to improve the transmission rate. However, disadvantage of high peak-to-average power ratio (PAPR) also brings into OWC systems, especially for multi-user communications, resulting low efficiency. This paper prop...

The problem of peak-to-average power ratio (PAPR) of high-order orthogonal frequency-division modulation (OFDM) is considered. Using results on level crossing of random processes, an upper bound on the probability that the PAPR of an OFDM signal will exceed a given value is derived. Numerical computations are used to show that this bound is tight for low-pass OFDM systems. The central limit the...

High peak-to-average power ratio (PAPR) of the transmitted signal is one of the limitations to employing orthogonal frequency division multiplexing (OFDM) system. This paper considers the use of the tone injection (TI) scheme to reduce the PAPR of an OFDM signal. However, optimal TI (OTI) requires an exhaustive search over all combinations of possible constellations, which is an NP-hard problem...

Orthogonal Frequency Division Multiplexing (OFDM) system with Continuous Phase Modulation (CPM) mappers is considered. Such a system is known to provide superior bit error rate performance by virtue of the memory introduced by the CPM mapper compared to OFDM systems with conventional memoryless mappers such as BPSK and QPSK. In this paper, the ability of CPM mappers in an OFDM system to reduce ...

The non-linear distortion caused by high peak-to-average power ratio (PAPR) of transmitted signal is a major drawback in the OFDM systems. In this paper, the proposed PAPR reduction scheme is to choose the corresponding symbol patterns with a low PAPR in the expanded signal space. However, the scheme has a high complexity for the selection of symbol pattern with the smallest signal power in a l...

OFDM system is combined with multipleinput multiple-output (MIMO) in order to increase the system capacity and diversity gain. However, one of the major drawback of MIMO-OFDM have high peak-toaverage power ratio (PAPR) in order to the signals transmittted on different antennas. In this paper, we propose Zadoff-Chu matrix Transform (ZCT) precoding based Selected Mapping (SLM) technique to reduce...

Solutions to the problem of large peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems are proposed. Although the design of PAPR reduction codewords has been extensively studied and the existence of asymptotically good codes with low PAPR has been proved, still no reduced PAPR capacity achieving code has been constructed. This is the topic of the curre...

İndis modülasyonlu dikgen frekans bölmeli çoğullama (OFDM-IM) sistemi yüksek spektral verimlilik, esneklik ve taşıyıcılar arası girişime karşı bağışıklık gibi üstün özellikleri ile öne çıkmaktadır. Fakat OFDM-IM sisteminde tepe gücü/ortalama güç oranı (PAPR) problemi bulunmaktadır. Yüksek PAPR, kuvvetlendiricilerinin doğrusal olmaması durumunda, iletilen sinyali bozarak sistem performansını olu...