The concept of Orthogonal Frequency Division Multiplexing (OFDM) was initiated and well prominent since 1966 and gradually reached to its development into standard system form during 1990. Large amounts of digital data, with high data rate, reliable communication over fading channels can be transmit over radio waves that is why OFDM is known to be an attractive technique for multicarrier transm...

Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system have been proposed in the recent past for providing high data-rate services over wireless channels. When combined with space time coding it provides the advantages of space-time coding and OFDM, resulting in a spectrally efficient wideband communication system. However, MIMO-OFDM system suffer with the ...

High peak-to-average power ratio of the transmit signal is a major drawback of multicarrier transmission such as OFDM. This paper describes 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 OFD...

Transformation of Bacillus anthracis with plasmid pUTE29-plcR-papR carrying the native Bacillus cereus plcR-papR gene cluster did not activate expression of B. anthracis hemolysin genes, even though these are expected to be responsive to activation by the global regulator PlcR. To further characterize the action of PlcR, we examined approximately 3,000 B. anthracis transformants containing pUTE...

Orthogonal Frequency Division Multiplexing (OFDM) is well known Technique for transmitting large data Over Radio waves. Its main disadvantage is PAPR (Peak to average power ratio) nothing but several sinusoidal leads. This paper presents Reduction PAPR using all proposed techniques . This Proposed techniques shows better performance for reduction in PAPR any technique can be used according to p...

Orthogonal frequency division multiplexing (OFDM) system is widely used wireless communication system in recent years. The major drawback of OFDM system is high Peak-to Average Power Ratio (PAPR). To reduce the PAPR of OFDM system different PAPR reduction techniques have been proposed. In this paper, we are evaluating the performance of different non-linear companding techniques.

orthogonal frequency division multiplexing (ofdm) has become a promising method for many wireless communication applications. however, one main drawback of ofdm systems is the high peak-to-average power ratio (papr). selected mapping (slm) is a well-known technique to decrease the problem of high papr in ofdm systems. in this method, transmitter is obliged to send some bits named side informati...

OFDM technique is comprehensively assumed in varied modern way communication systems due to its high data rate transmission capability and toughness to the multipath blurring channel. One noteworthy detriment of the OFDM signal is towering PAPR. Huge diversity of magnitude of OFDM signal represents a major drawback for strengthening of signal in mobile communication systems. This paper reveals ...

Orthogonal Frequency Division Multiplexing (OFDM) has emerged as a promising modulation technique for high speed optical systems as it reduces intersymbol interference and offers high spectral efficiency. But it has an inherent drawback of high Peak to Average Power Ratio (PAPR) due to multiple subcarriers which makes it sensitive to non linear effects. Different techniques have been proposed f...

Orthogonal Frequency Division Multiplexing System (OFDM) suffers from the problem of high peak to average power ratio reduction (PAPR). It is studied that Golay complementary codes (GCC) can provide codewords with low PAPR. However, the usefulness of this coding technique is limited to the OFDM with a small number of subcarriers. With the help of certain theorems and definitions, this paper dis...