R.Selvakumar

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Anna University Coimbatore

PAPR

Educación Tecnología Empresariales

Under The Guidens Of Mr.K.N.Vijeyakumar,M.E, PhD Presented by R. Selvakumar.B.Tech MIMO-OFDM Link performance with Reduction of PAPR Using Linear Companding Transform 03.10.2009 MIMO-OFDM&PAPR

Area of work: OFDM (Orthogonal Frequency Division Multiplexing)

TYPES OF OFDM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

Objective: To use linear companding transform for ofdm signals, To make performance analysis in terms of peak to average power reduction and bit error rate.

LITERATURE SURVEY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

LITERATURE SURVEY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

EXISTING METHOD ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

BASE PAPERS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BASE PAPER ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BASE PAPER ,[object Object],03.10.2009 MIMO-OFDM&PAPR

PROPOSED METHOD ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

CHARACTERISTICS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

IMPLEMENTATION Used Terms: Tool Used: ,[object Object],[object Object],[object Object],[object Object],03.10.2009 MIMO-OFDM&PAPR

THANK YOU 03.10.2009 MIMO-OFDM&PAPR

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“Orthogonal frequency division multiplexing method used to achieve the today’s need of wireless communication 3GPP Association for the use of LTE. The higher data rate, higher bit rate, mitigated delay spread, lower multipath distortion, OFDM system has few major issues associated with ratio (PAPR)” associated with the signal. interleaved OFDM, selective mapping (SLM) windowing, clipping, filtering, tone rejection(TR), tone injection(TI), compandin

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The increasing demand of ubiquitous multimedia service forces the future wireless communication for higher data rates to the dynamic wireless environment. Orthogonal Frequency-Division Multiplexing (OFDM) is the most common technique has received more attention due to its high spectral efficiency and its resistance to multipath fading in addition to high data rate and robust performance. Presence of large number of subcarriers leads to a large dynamic range with large Peak to Average Power Ratio (PAPR) in OFDM. High PAPR is the major limitation of OFDM in the present scenario. The present research work utilizes conic and convex optimization filtering techniques in customized formulations. The first proposed technique uses Standard Deviation based Iterative Clipping and Filtering (SD-ICF) to minimize PAPR. The filtering simply removes the out-of band spectral re-growth without considering the effect on the time domain peak after the IFFT operation. The main aspect of the SD-ICF approach is that, oversampling increases the resolution of the OFDM symbol giving a closer approximation to the band limited signal after filtering. As a result, it tends to cause sizable time-domain peaks, requiring clipping and filtering to be repeated many iterations before achieving the desired PAPR. The filter response is modified by exploiting convex optimization. As the PAPR is reduced to an optimized value, the effect of oversampling is also minimal. The second approach utilizes a Custom Optimized Iterative Adaptive Clipping and Filtering (COIACF) technique for PAPR reduction. COIACF minimizes PAPR to a desired level in less number of iterations. Moreover, COIACF include an Improved FFT-based method of constructing the linear system of equations, an improved update procedure to reduce the number of iterations. The proposed method shows a greater reduction in PAPR in lesser iterations with reduced out-of-band distortion and bit error rate. Here COIACF uses FFT to reduce the number of iterations. The third proposed Tone Reservation (TR) based technique utilizes the few unused OFDM subcarriers. There are unused subcarriers called Peak Reduction Carriers (PRCs) which are reserved to minimize the BER of the transmitted OFDM signal.TR method is combined with customized convex optimization minimizes the PAPR and BER at a lower computational cost.

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Orthogonal frequency division Multiplexing (OFDM) is one of the most popular multicarrier or multiplexing modulation techniques which transmits many signals over a single path in high speed wireless communication. OFDM convert high data rate stream in to smaller data rate stream. Due to this high data rate and ability to combat frequency selective fading, OFDM has a strong candidate for 4G wireless networks. Because of OFDM-MIMO advantages in multipath fading channel e.g. stout against ISI, ICI and some other advantages like best QoS for multiple users, efficient convention of bandwidth it is suggested to be the modulation technique for next generation 4G networks e.g. LTE. OFDM combined with multiple-input multiple-output (MIMO) to increase system capacity over the time variant frequency-selective channels and the diversity gain. The radio transmitter stations for covering and getting enough transmitted power in their desired area has to use High Power Amplifier (HPA) operable near to the saturation region or else, an aspect memory-less nonlinear distortion will affect the communication path. But along with all its advantages there are some disadvantages also. e.g. High PAPR (Peak to Average Power Ratio) at the transmitter end and BER (Bit Error Rate) at the receiving end. As OFDM is only used in the downlink of 4G networks. To reduce the problems of OFDM-MIMO systems some procedures as SLM, PTS, Clipping, Coding, & Pre-coding etc are suggested but none of them is proficient enough to reduce the PAPR and BER up to standard value. This Paper will discuss some techniques of PAPR reduction, and both their advantages and disadvantages.

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Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) is used as efficacious procedure for ultra-wideband (UWB) wireless communication applications, which divides the spectrum into various subbands, whose bandwidth is approximately 500MHz. Major arduousness in multiband-OFDM is ,it have very large peak to average power ratio value which causes the signal to enter into dynamic region that consequence in the loss of orthogonal properties and results in the interference of the carrier signals which crops the amplifier saturation and finally limits the capacity of the system. Many PAPR amortize algorithms have reported in the survey and pre-coding is PAPR reduction which is inserted after modulation in the OFDM system. The Existing work presents the reduction of that value by different clipping techniques namely Classical-Clipping (CC), Heavy side-Clipping (HC), Deep-Clipping (DC) and Smooth-Clipping (SC) and their comparison analysis is done. Every clipping method is best at its own level .The proficiency of these strategies are evaluated in locutions of average power disparity, complete system decadence and PAPR reduction. Finally results show the MB OFDM yields better performance to reduce PAPR in effective way.

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Mobile wireless communication providers are expected by their numerous subscribers to provide network that can allow higher data rates, and good voice quality. However, this may be restricted due to some technical problems such as limited availability of radio frequency spectrum, bandwidth, channel capacity, geographical areas and transmission problems caused by various factors like fading and multipath distortion. All these lead to overall system performance degradation. This has led to various studies on how improvement on the performance of wireless communication can be realized using different techniques. This paper is a review of some scholarly works on this subject. To achieve this some recent scholarly articles were accessed online and their findings were highlighted. It was observed that all the articles reviewed had results drawn only from theoretical analysis. Based on this, one of the recommendations is that theoretical analysis should be supported with data obtained from carrying out RF measurements in the field where possible.

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Multiple-input multiple-output (MIMO) techniques are used in wireless communications for achieving high spectral efficiency; however, a fast fading spatial channel can increase the outage probability of a MIMO system if not taken care of. This paper investigates the use of orthogonal frequency division multiplexing (OFDM) modulation technique for a MIMO system operating in fast Rayleigh fading channels with the aim of eliminating outage probabilities in the MIMO systems. Simulation results show that the MIMO-OFDM system gives significant reduction in outage probabilities compared to the conventional MIMO system.

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The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.

The International Journal of Engineering and Science (The IJES)

The International Journal of Engineering and Science (The IJES)

The International Journal of Engineering and Science (The IJES)

In this paper, we proposed a particle swarm optimization (PSO) based partial transmit sequence (PTS) technique in order to achieve the lowest Peak-to-Average Power Ratio(PAPR) in Multiple Input Multiple Output- Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. Our approach consist of applying the PSO based PTS on each antenna of the system in order to find the optimal phase factors, which is a straightforward method to get the minimum PAPR in such a system. The simulation results demonstrate that the PSO based PTS algorithm when applied to MIMO-OFDM systems with a wide range of phase factors, tends to give a high performance. In addition, there is no need to increase the number of particles of the PSO algorithm to enhance the performance of the system. As a result of this, the complexity of finding the minimum PAPR is kept at a reasonable level.

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Next generation wireless communication technology long term evolution (LTE) has implemented orthogonal frequency division multiplexing (OFDM) technique as a strong candidate for radio access systems. It has several attributes such as providing robustness to multipath fading & impulse noise, eliminating intersymbol interference (ISI), inter carrier interference (ICI) & the need for equalizers. The major challenging issue of OFDM technique is the high peak to average power ratio (PAPR) which is defined as the ratio of the peak power to the average power of the OFDM signal. A trade-off is necessary for reducing PAPR with increasing bit error rate (BER), computational complexity or data rate loss etc. In this paper, a moderately modified design of amplitude clipping & filtering operation (ACF) is proposed and implemented which shows the significant improvement in case of PAPR reduction for both quadrature phase shift keying (QPSK) & quadrature amplitude modulation (QAM) while increasing slight BER match up to to an existing method.

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B033206014

inventionjournals

The growth of wireless communication technologies has been producing the intense demand for high-speed, efficient, reliable voice & data communication. As a result, third generation partnership project (3GPP) has implemented next generation wireless communication technology long term evolution (LTE) which is designed to increase the capacity and speed of existing mobile telephone & data networks. LTE has adopted a multicarrier transmission technique known as orthogonal frequency division multiplexing (OFDM). OFDM meets the LTE requirement for spectrum flexibility and enables cost-efficient solutions for very wide carriers. One major generic problem of OFDM technique is high peak to average power ratio (PAPR) which is defined as the ratio of the peak power to the average power of the OFDM signal. A trade-off is necessary for reducing PAPR with increasing bit error rate (BER), computational complexity or data rate loss etc. In this paper, two clipping based filtering methods have been implemented & also analyzed their modulation effects on reducing PAPR.

Performance comparison of two clipping based filtering methods for papr reduc...

Performance comparison of two clipping based filtering methods for papr reduc...

Performance comparison of two clipping based filtering methods for papr reduc...

Next generation wireless communication technology long term evolution (LTE) has implemented orthogonal frequency division multiplexing (OFDM) technique as a strong candidate for radio access systems. It has several attributes such as providing robustness to multipath fading & impulse noise, eliminating intersymbol interference (ISI), inter carrier interference (ICI) & the need for equalizers. The major challenging issue of OFDM technique is the high peak to average power ratio (PAPR) which is defined as the ratio of the peak power to the average power of the OFDM signal. A trade-off is necessary for reducing PAPR with increasing bit error rate (BER), computational complexity or data rate loss etc. In this paper, a moderately modified design of amplitude clipping & filtering operation (ACF) is proposed and implemented which shows the significant improvement in case of PAPR reduction for both quadrature phase shift keying (QPSK) & quadrature amplitude modulation (QAM) while increasing slight BER match up to to an existing method.

A modified design of acf operation for reducing papr of ofdm signal

A modified design of acf operation for reducing papr of ofdm signal

A modified design of acf operation for reducing papr of ofdm signal

Ijecet 06 10_006

Ijecet 06 10_006

Ijecet 06 10_006

IAEME Publication

The Evolution Of Optical Networks

The Evolution Of Optical Networks

The Evolution Of Optical Networks

OFDM (Orthogonal Frequency Division Multiplexing) has been raised a new modulation technique. Due to its advantages in multipath fading channel e.g. robust against ISI, ICI and some other advantages like best QoS for multiple users, efficient usage of bandwidth it is suggested to be the modulation technique for next generation 4G networks e.g. LTE. But along with all its advantages there are some disadvantages also e.g. High PAPR (Peak to Average Power Ratio) at the transmitter end and BER (Bit Error Rate) at the receiving end. Since OFDM is only used in the downlink of 4G networks. To reduce the problems of OFDM some techniques e.g. SLM, PTS, Clipping, Coding, & Pre-coding etc are suggested but none of them is reduce the PAPR and BER to an acceptable value. This Paper will discuss some techniques of PAPR & BER reduction, and their advantages and disadvantages in detail.

A review paper on the papr analysis of orthogonal frequency division multiple...

A review paper on the papr analysis of orthogonal frequency division multiple...

A review paper on the papr analysis of orthogonal frequency division multiple...

Aj044236240

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A Modified Design Of Acf Operation For Reducing Papr Of Ofdm Signal

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B033206014

Performance comparison of two clipping based filtering methods for papr reduc...

Performance comparison of two clipping based filtering methods for papr reduc...

Performance comparison of two clipping based filtering methods for papr reduc...

A modified design of acf operation for reducing papr of ofdm signal

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R.Selvakumar

1. Under The Guidens Of Mr.K.N.Vijeyakumar,M.E, PhD Presented by R. Selvakumar.B.Tech MIMO-OFDM Link performance with Reduction of PAPR Using Linear Companding Transform 03.10.2009 MIMO-OFDM&PAPR

2. Area of work: OFDM (Orthogonal Frequency Division Multiplexing)

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4. Objective: To use linear companding transform for ofdm signals, To make performance analysis in terms of peak to average power reduction and bit error rate.

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14. THANK YOU 03.10.2009 MIMO-OFDM&PAPR