PAPR Reduction in the OFDM Signal Using Selective Mapping (original) (raw)

PAPR reduction of Coded OFDM signal using Selective Mapping Technique

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation (MCM) technique which seems to be an attractive candidate for fourth generation (4G) wireless communication systems. Peak-to-average Power ratio(PAPR) problem is the major drawback of multicarrier transmission system which leads to power inefficiency.There are various techniques which can be used to reduce PAPR.In this paper Selective mapping technique(SLM) is used to reduce PAPR of coded OFDM signal. Peak-to-Average Power Ratio(PAPR), Complementary Cumulative Distribution Function (CCDF), Selective Mapping(SLM),Partial Transmit Sequence (PTS).Reed Solomon(RS)

PAPR REDUCTION OF OFDM SIGNALS USING SELECTIVE MAPPING AND CLIPPING HYBRID SCHEME

The Orthogonal Frequency Division Multiplexing is one of the modulation techniques widely used in the broadband wireless technology. One of the main problems of this technology is the high peak-to-average power ratio of transmission signal due to the superposition of many subcarriers. This paper presents a new hybrid peak-toaverage power ratio reduction technique, which combines a selective mapping method with the clipping method. The paper presents the performance and advantages of the new technique and compares it with other existing methods.

Efficient Application of Selected Mapping with Clipping for PAPR Reduction in OFDM Systems

Bonfring

Orthogonal Frequency Division Multiplexing (OFDM) is an inimitable technology in wireless communication. High peak-to-average power ratio (PAPR) is a challenging issue in OFDM system. Large PAPR results in significant distortion in OFDM signal when passed through nonlinear high power amplifier. Selected mapping (SLM) is an efficient technique to reduce PAPR. In this work we efficiently apply SLM technique with clipping to reduce PAPR. And the simulation results show that the proposed techniques have better PAPR reduction performance than conventional Selected Mapping technique and SLM with interleaving

IJERT-PAPR Reduction in OFDM using Reduced Complexity Selective Mapping Technique

International Journal of Engineering Research and Technology (IJERT), 2014

https://www.ijert.org/papr-reduction-in-ofdm-using-reduced-complexity-selective-mapping-technique https://www.ijert.org/research/papr-reduction-in-ofdm-using-reduced-complexity-selective-mapping-technique-IJERTV3IS090223.pdf Orthogonal Frequency Division Multiplexing (OFDM) is the most promising technique available and is most commonly used due to its advantages like very high data rate, noise immunity and efficient bandwidth utilization. One of the major drawback of OFDM is its high Peak to Average Power Ratio (PAPR). In this paper Selective mapping is used to perform PAPR reduction and same time reducing its complexity so that its implementation uses less floor area and on chip requirements. Results shows that PAPR reduction is similar to Conventional SLM but new technique is less complex than original one in terms of IFFT blocks used and Multipliers used in the process. Keywords-Orthogonal frequency division multiplexing (OFDM), Peak to average power ratio (PAPR), Selective Mapping (SLM), Bit Error Rate (BER), Digital Subscriber Line (DSL), Partial Transmit Sequence (PTS).

SELECTED MAPPING, CLIPPING AND DIFFERENTIAL SCALING FOR REDUCTION OF PAPR IN OFDM SYSTEM

In this paper, an SLM technique is introduced for the PAPR reduction of space-frequencyblock-coded OFDM systems with Alamouti coding scheme. Selected mapping (SLM) is a well-known technique for peak to-average-power ratio (PAPR) reduction of Orthogonal Frequency Division Multiplexing (OFDM) systems. In this paper, we also introduced a simple technique for the reduction of high Peak to Average Power Ratio (PAPR), based on Clipping and Differential Scaling, in Orthogonal Frequency Division Multiplexing (OFDM) systems. In this technique, the amplitude of complex OFDM signal is clipped and then scaled in such a way that the PAPR is reduced without causing much degradation in bit error rate (BER). We have determined the threshold values for clipping and scaling using Monte Carlo Simulations. We have also compared the performance of SLM with the clipping scaling technique.

A novel selected mapping technique for PAPR reduction in OFDM systems

IEEE Transactions on Communications, 2008

Selected mapping (SLM) is a well-known method for reducing the peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems. The main drawback of this technique is that, for each data block, it requires the transmission of several side information bits, which results in some data rate loss. These redundant bits are so critical to the error performance of the system that they need in practice to be protected by a powerful channel code. This increases the system complexity and transmission delay, and decreases the data rate even further. In this paper, we propose a novel SLM method for which no side information needs to be sent. By considering the example of an OFDM system using 16-QAM modulation, it is shown that the proposed method performs very well both in terms of PAPR reduction and bit error rate at the receiver output.

REDUCTION OF THE PAPR EFFECT IN OFDM SYSTEMS USING SELECTIVE MAPPING TECHNIQUE

The high peak-to-average power ratio (PAPR) of the transmitted signal in Orthogonal Frequency Division Multiplexing (OFDM) system. It leads to problems as which distorts the signal if the transmitter contains nonlinear components such as power amplifiers and causes some deficiencies such as inter-modulation, spectral spreading and changing in signal constellation. The favorite properties of OFDM signal is it has high spectral efficiency, robustness to channel fading, immunity to impulse interference, uniform average spectral density, capability of handling very strong echoes and less nonlinear distortion. Even though here are many advantages of OFDM, it has two main drawbacks, they are high PAPR and frequency offset. The result of the PAPR effect in OFDM system is investigated and proposed a novel approach to reduce PAPR effect using selective mapping (SLM) technique.

Improved Selected Mapping Technique for Reduction of PAPR in OFDM Systems

International Journal of Advanced Computer Science and Applications, 2020

High peak to average power ratio (PAPR) is a limiting factor towards the performance of an OFDM system. Selected Mapping (SLM) is a popular peak to average power ratio (PAPR) reduction scheme used with the OFDM systems. In this technique, U set of candidate sequences are generated that leads to improvement in the PAPR reduction ability of the OFDM systems. The major concern of the conventional SLM is that as the number of candidates is increased, there is a proportional rise in the inverse fast Fourier transforms (IFFT) computations of the systems. In our article we have proposed a scheme in which we increase the number of candidate sequence as (U+U 2 /4) that leads to improved PAPR performance of the OFDM systems without any equivalent rise in the IFFT computations. It has been demonstrated that both the simulation and analytical results are well-approximated in our proposed schemes. We also estimate the threshold value of PAPR at a fixed value of complementary cumulative distribution function (CCDF) for different number of subcarriers and candidate sequences. Results demonstrate that our proposed scheme outperforms in terms of PAPR reduction ability of the OFDM signal and obtains effective PAPR threshold values with negligible loss in BER performance of the system.

BEHAVIOUR OF OFDM SYSTEM AND REDUCTION OF ITS PAPR BY USING SELECTIVE MAPPING IN MATLAB

The OFDM technique divides the total bandwidth into many narrow sub-channels and sends data in parallel. It has various advantages, such as high spectral efficiency, immunity to impulse interference and, frequency selective fading without having powerful channel equalizer. But one of the major drawbacks of the OFDM system is high PAPR. OFDM signal consists of lot of independent modulated subcarriers, which created the problem of PAPR. It is impossible to send this high peak amplitude signals to the transmitter without reducing peaks. So we have to reduce high peak amplitude of the signals before transmitting. Communication is one in all the numerous features of existence. A new DSI-SLM method for PAPR reduction in OFDM system state that the phase sequence and dummy sequences added to the signal improves the PAPR reduction in OFDM signals whereas less hardware resources and less time are required to achieve the desired result.