Low PAPR Filtered OFDM using Modified Selective Mapping (original) (raw)
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European Journal of Theoretical and Applied Sciences
Future generation mobile communication system requires asynchronous transmission of data, reduced out-of-band power emission, low peak-to-average power ratio, low latency, high data transmission rate, better spectrum, energy, and power efficiency, etc. Investigations on suitable waveform candidates for future-generation mobile communication have been reported in this paper. Filtered Orthogonal Frequency Division Multiplexing (F- OFDM), F- OFDM with Selective Mapping Method (SLM), and F- OFDM with Partial Transmit Sequence (PTS) technique, have been investigated. Its performances have been evaluated in terms of peak-to-average power ratio (PAPR), bit error rate (BER), and out-of-band power emissions. F–OFDM is a suitable candidate for future-generation mobile communication systems that can be used with single-rate or multirate filters. It can also be used in combination with other PAPR reduction techniques. F-OFDM with PTS technique requires a smaller number of IFFT operations than F...
IJERT-Comparative Study of Reducing the PAPR of OFDM using the Methods of Clipping and SLM
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/comparative-study-of-reducing-the-papr-of-ofdm-using-the-methods-of-clipping-and-slm https://www.ijert.org/research/comparative-study-of-reducing-the-papr-of-ofdm-using-the-methods-of-clipping-and-slm-IJERTCONV8IS14030.pdf Orthogonal Frequency Division Multiplexing (OFDM) is an well-structured multicarrier modulation that underlines most of the current and next era of high-speed wireless communication systems. When there are large number of subcarriers are used, the OFDM is characterized by high peak to average power ratio (PAPR). A high PAPR is one of the problems. It is nothing but a nonlinear distortion produced when passed through the power amplifier at the front end of the transmitter. In this paper, two techniques such as clipping and filtering and selected Mapping (SLM) is proposed and compared. The results are done by simulation and show that by using clipping and filtering, PAPR is 10.6189 db with better efficiency and for SLM technique PAPR is 13.4129db.
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.
Deleted Journal, 2024
Orthogonality for the frequency division multiplexing is the approach which is widely accepted for the current wireless communication, but as the technology is on the verge of moving in to the fifth generation wireless communication there are some limitations such as PAPR, PSD and BER of Orthogonal frequency division multiplexing which cannot be ignored for the fifth generation as promises the Massive machine communication, huge Reliability and minimum latency and extended mobile broadband, so to achieve above promises here in this proposed research work the filtering technique for the OFDM also in this research work specifies the importance of windowing techniques in the design of filters for Filtered Orthogonal Frequency Division Multiplexing. This is mainly by reducing Peak-to-Average Power Ratio and optimizing Bit Error Rate to minimize Out-of-Band Emissions, which contributes to enhancing spectral containment properties, thus reducing inter-system interferences in the field of communication systems. This study elucidates the principles of windowing and application in f-OFDM to offer immediate insight into how filters are designed under optimal capacity for high system efficiency. The use of windowing in simulations has proven effective in enhancing the filter design process, and demonstrates the future of the evolution of digital communications systems ,the waveform by means of various windowing methods considering the parameters Power spectral density, Bit error rate and PAPR, simulation results shows that the nuttall's blackman-harris, kaiser & root raised cosine windowed filter function are best suitable for the filtering the OFDM signal to improve the spectral efficiency, BER.
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 in the OFDM Signal Using Selective Mapping
Nowadays Orthogonal Frequency Division Multiplexing is becoming more and more popular Because of it is attractive techniques for high data rate transmission. OFDM is widely used in 4G technologies in recent times. Main advantage of OFDM is that it uses orthogonal signals so removes inter-signal interference. PAPR ratio in OFDM is very high because it uses Multicarrier modulation, which is its main drawback. High PAPR means more power need at transmission side. PAPR can be decreased using various techniques such as clipping, selective mapping, etc. In this paper, criterion for new scheme selective mapping is introduced for PAPR reduction in OFDM.
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).
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.
PAPR Performance of OFDM System Using Modified SLM Approach
where the different code having same information and by using selection criteria one of the codes having less PAPR is selected. Modified approach reduces system PAPR to a great extend as well as it reduces cost and complexity of the system. From simulated results it shows that the modified SLM approach is more suitable for practical implementation.
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.