Nandalal Vijayakumar - Academia.edu (original) (raw)

Papers by Nandalal Vijayakumar

Research paper thumbnail of A Survey on Design Issues, Challenges, and Applications of Terahertz based 6G Communication

Lecture notes in networks and systems, 2022

Research paper thumbnail of Investigations of Substrate and Patch Materials for Sub-Terahertz Wireless Applications Scenario

Journal of Electronic Materials

Research paper thumbnail of A detailed study on LDPC encoding techniques

Wireless Communication Technology, Dec 26, 2018

This survey deals with LDPC encoding techniques. Different types of error detection and correctio... more This survey deals with LDPC encoding techniques. Different types of error detection and correction codes have been studied. BHC codes, Turbo code, LDPC Codes, Hamming codes are some of the vast classes of codes. Low Decoding complexity and efficient throughput are the achieved by using LDPC codes. Robert G.Gallager introduced this code so LDPC codes are Gallager code. After then Mackay and Neal in 1995 rediscovered LDPC codes because of its bit error performance. It consist of sparse of ones ie., low density of one's because of this property decoding is simple. The major setback in LDPC codes are Encoding Complexity. WLAN (IEEE 802.11n) and MIMO OFDM are some of the applications of code. This code is a class of forward error correction (FEC) technique that exhibits capacity of impending near Shannon's limit. LDPC codes are well identified for their capacity-approaching performance The LDPC codes have been selected as forward error correction in application including digital video broadcasting (DVBS2), 10 Gigabit Ethernet (10GBASE-T) broadband wireless access (Wi-Max), wireless local area network, deep-space communications.

Research paper thumbnail of An Efficient Approach for Squared Creast Factor Reduction in OFDM Systems Using Tone Reservation with Customized Convex Optimization

Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multipl... more Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. This scheme uses a number of sub-carriers and converts a frequency selective fading channel to a set of parallel flat fading channels. The OFDM signal is having a drawback that some signal values can be much higher than the average value. This results in high Squared Crest Factor (SCF). This paper deal with the Tone Reservation (TR) technique for reducing SCF. In this scheme few subcarriers are reserved to reduce the peak signal. These reserved carriers are called as Peak Reduction Carriers (PRCs) and these PRCs are used to reduce the SCF of the original signal. Similarly the Bit Error Rate also gets lowered. In contrast to previous methods, the TR method with Customized Convex Optimization implies a very quick convergence of minimum SCF and the bit error rate solution at a lower computational cost. The proposed method is compared with the SCF reduction techniques ...

Research paper thumbnail of “An Improved Conic Optimization Technique for PAPR Reduction with Less Processing Delay in OFDM Systems”

Orthogonal Frequency Division Multiplexing (OFDM), a digital multi-carrier modulation scheme, fin... more Orthogonal Frequency Division Multiplexing (OFDM), a digital multi-carrier modulation scheme, finds wide application in the field of digital communication in recent years. This physical layer standard is perhaps the most spectrally efficient method discovered so far, and it mitigates the severe problem of multipath propagation. But the high Peak-to-Average Power Ratio (PAPR) of OFDM signals has lead to deterioration in the performance of the system. Thus a number of techniques have been put forward to minimize the peak power. Of these, clipping and filtering (CF) is a very simple approach. In this paper, an improvement has been made to the classical method of iterative CF (ICF). The proposed method estimates the clipping level based on standard deviation of the available OFDM signal. And also the filter design is optimized using convex optimization techniques. Using this technique complementary cumulative distribution function (CCDF) curve shows a sharp and faster decay of PAPR to a...

Research paper thumbnail of “Performance Measure of Microstrip Antenna for Wearable Application”

Modern communication systems are driven by the concept of being connected anywhere and at any tim... more Modern communication systems are driven by the concept of being connected anywhere and at any time. Fuelled by the idea of a body-centric approach to modern communication technology, many research projects have been initiated to integrate antennas and radio frequency (RF) systems into clothes with regard to size reduction and cost effectiveness; so that the wearer may not notice the existence of these subsystems. Integrating antennas into fabrics is a potential way for facilitating many applications, such as health monitoring of patients, fire-fighting, rescue work, and space and military personal communications.The antenna designed for these applications should be flexible, lightweight and mechanically robust. The antenna structure is simple and looks like an adhesive bandage, and can be placed on human tissue.This paper presents a novel planar, via-free, printed antenna which looks like an adhesive bandage is designed on RT Duroid 5880 dielectric substrate. Later in order to desig...

Research paper thumbnail of Performance Analysis of Microstrip Antenna for On-Body Application

Research paper thumbnail of “An Iterative Statistical Dispersion Based Clipping and Conic Optimized Filtering for Swift Lowering of PAPR in OFDM Systems

European Journal of Scientific Research

Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme th... more Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme thus finds wide application in the field of digital communication in recent years. This physical layer standard is perhaps the most spectrally efficient method discovered so far, and it mitigates the severe problem of multipath propagation that causes massive data errors and loss of signal in the microwave and UHF spectrum. But the high Peak-to-Average Power Ratio (PAPR) of OFDM signals has lead to deterioration in the performance of the system. Thus a number of techniques have been put forward to minimize the peak power. Of these, clipping and filtering (CF) is a very simple approach. In this paper, an improvement has been made to the classical method of iterative CF (ICF). The proposed method estimates the clipping level based on standard deviation of the available OFDM signal. And also the filter design is optimized using convex optimization techniques. Using this technique complementar...

Research paper thumbnail of Power Reduction in OFDM Systems Using Tone Reservation with Customized Convex Optimization

Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multipl... more Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. This scheme uses a number of sub-carriers and converts a frequency selective fading channel to a set of parallel flat fading channels. The OFDM signal is having a drawback that some signal values can be much higher than the average value. This results in high Squared Crest Factor(SCF).This paper analyzes the Tone Reservation (TR) technique for SCF reduction. In this scheme, a small number of unused subcarriers called Peak Reduction Carriers (PRCs) are reserved to reduce the SCF and the goal of the TR scheme is to find the optimal values of the PRCs that minimize the SCF of the transmitted OFDM signal. Similarly the Bit Error Rate also gets lowered. In contrast to previous methods, the TR method with Customized Convex Optimization implies a very quick convergence of minimum SCF and the bit error rate solution at a lower computational cost. Also the effects of oversa...

Research paper thumbnail of Design and Analysis of Microstrip Antenna for Wearable Application

Modern communication systems are driven by the concept of being connected anywhere and at any tim... more Modern communication systems are driven by the concept of being connected anywhere and at any time. Fuelled by the idea of a body-centric approach to modern communication technology, many research projects have been initiated to integrate antennas and radio frequency (RF) systems into clothes with regard to size reduction and cost-effectiveness; so that the wearer may not notice the existence of these subsystems. Integrating antennas with electronics is a vital role for supporting many applications, biomedical, military and commercial fields. The antenna designed for these applications should be wideband, not sensitive to human body. The antenna structure is simple and looks like an adhesive bandage, and can be placed on human tissue. This paper presents a novel planar, via-free, printed antenna which looks like an adhesive bandage is designed on RT Duroid 5880 dielectric substrate. Later in order to design a flexible antenna, the antenna is designed on flexible substrates such as f...

Research paper thumbnail of Power optimization in OFDM systems using Customized Convex optimization in Clipping and Differential Scaling

In this paper, an efficient method for minimizing the high Peak to Average Power Ratio (PAPR), ba... more In this paper, an efficient method for minimizing the high Peak to Average Power Ratio (PAPR), based on Clipping and Differential Scaling, in Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. In this technique, the amplitude of complex OFDM signal is clipped and then scaled in such a way so that the PAPR is reduced without causing much degradation in bit error rate (BER). Convex Optimization technique is implemented to obtain the minimum value of PAPR. PAPR and BER of the system considered using simulations for QPSK constellation are presented.Performance of the proposed PAPR reduction technique with the performance of the existing techniques is also compared.

Research paper thumbnail of Oversampled convex optimized clipping technique for Squared Crest Factor (SCF) reduction in OFDM signal

2013 International Conference on Advanced Computing and Communication Systems, 2013

ABSTRACT There are numerous benefits in the transmission of a signal using Orthogonal Frequency D... more ABSTRACT There are numerous benefits in the transmission of a signal using Orthogonal Frequency Division Multiplexing (OFDM). They are high data rate, robust performance, high spectrum efficiency, etc., but high crest factor (cf), is the main drawback which minimises transmitter power efficiency and complexity in hardware implementation. The method used here is a concept of iterative standard deviation based clipping and optimized filtering. The proposed method shows a higher reduction in Squared Crest Factor and bit error rate with minimum number of iterations and reduced out-of-band distortion when compared over classical (ICF) methods. The effects of oversampling at l = 1,2,4,8 on the performance of proposed OFDM system is also discussed.

Research paper thumbnail of An Efficient Power Reduction Technique in Orthogonal Frequency Division Multiplexing System Using Tone Reservation

Journal of Computer Science, 2013

In a basic communication system, the data's are modulated onto a single carrier frequency. The av... more In a basic communication system, the data's are modulated onto a single carrier frequency. The available bandwidth is then totally occupied by each symbol. This kind of system can lead to Inter-Symbol-Interference (ISI) in case of frequency selective fading. The basic idea of Orthogonal Frequency Division Multiplexing (OFDM) is to divide the available spectrum into several orthogonal sub channels so that each narrowband sub channel experiences almost flat fading. In OFDM system, orthogonally placed sub-carriers are used to carry the data from the transmitter end to the receiver end. However, the major challenging issue is to reduce PAPR and Bit Error Rate (BER). The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). Tone reservation uses other unused or reserved tones to design a peakcancelling signal that lowers the PAR of a transmit OFDM block. Similarly it lowers the bit error rate. In contrast to previous methods, the tone reservation with convex optimization implies a very quick convergence of minimum-PAR and bit error rate solution at a lower computational cost. Also the effects of oversampling at l = 1,2,4,8 on the performance of proposed OFDM system is discussed.

Research paper thumbnail of An assiduous approach for power reduction in OFDM system using tone reservation

2013 International Conference on Advanced Computing and Communication Systems, 2013

ABSTRACT Orthogonal Frequency-Division Multiplexing (OFDM) is a method of digital modulation in w... more ABSTRACT Orthogonal Frequency-Division Multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. Here each sub-carrier is modulated with a conventional modulation scheme at a low symbol rate. The low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate intersymbol interference (ISI) and to improve signal-to-noise ratio. But the major challenging issue faced by the OFDM system is the reduction of Squared Crest Factor and Bit Error Rate. The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). Tone Reservation uses other unused or reserved tones to design a peak-cancelling signal that lowers the PAR of a transmit OFDM block. Similarly it lowers the bit error rate. In contrast to previous methods, the tone reservation with convex optimization implies a very quick convergence of minimum-PAR and bit error rate solution at a lower computational cost. Also the effects of oversampling at l = 1,2,4,8 on the performance of proposed OFDM system is discussed.

Research paper thumbnail of Peak Power Reduction through Conic Optimized Sigma Clipping and Filtering

Applied Mechanics and Materials, 2014

High Peak to Average Power Ratio (PAPR) of OFDM reduces transmitter power efficiency and increase... more High Peak to Average Power Ratio (PAPR) of OFDM reduces transmitter power efficiency and increases complexity in hardware implementation. In the paper, the high PAPR is reduced using optimized Standard Deviation based Iterative Clipping and Filtering (SD-ICF).The proposed method achieves a greater reduction in PAPR in a few iterations with reduced out-of-band distortion and bit error rate when compared over classical clipping techniques.Also, the effects of oversampling on the performance of proposed OFDM system is discussed.

Research paper thumbnail of PAPR Reduction of OFDM Signal via Custom Conic Optimized Iterative Adaptive Clipping and Filtering

Wireless Personal Communications, 2014

ABSTRACT High peak to average power ratio (PAPR) of OFDM reduces the transmitter power efficiency... more ABSTRACT High peak to average power ratio (PAPR) of OFDM reduces the transmitter power efficiency and increases the complication in hardware implementation. A number of techniques have been developed to minimize PAPR of OFDM. Among these techniques, iterative clipping and filtering (ICF) is an effective recent technique that produces significant results in minimizing PAPR. But, the major limitation of this approach is that it requires several iterations for minimizing PAPR. In order to overcome the above limitation, an optimization based ICF is used in this research work. An efficient custom optimized adaptive clipping and filtering technique is proposed. The proposed method shows a greater reduction in PAPR in lesser iterations with reduced out-of-band distortion and bit error rate when compared over classical clipping techniques. Moreover, the effects of oversampling on the performance of the proposed OFDM system are also evaluated.

Research paper thumbnail of A Survey on Design Issues, Challenges, and Applications of Terahertz based 6G Communication

Lecture notes in networks and systems, 2022

Research paper thumbnail of Investigations of Substrate and Patch Materials for Sub-Terahertz Wireless Applications Scenario

Journal of Electronic Materials

Research paper thumbnail of A detailed study on LDPC encoding techniques

Wireless Communication Technology, Dec 26, 2018

This survey deals with LDPC encoding techniques. Different types of error detection and correctio... more This survey deals with LDPC encoding techniques. Different types of error detection and correction codes have been studied. BHC codes, Turbo code, LDPC Codes, Hamming codes are some of the vast classes of codes. Low Decoding complexity and efficient throughput are the achieved by using LDPC codes. Robert G.Gallager introduced this code so LDPC codes are Gallager code. After then Mackay and Neal in 1995 rediscovered LDPC codes because of its bit error performance. It consist of sparse of ones ie., low density of one's because of this property decoding is simple. The major setback in LDPC codes are Encoding Complexity. WLAN (IEEE 802.11n) and MIMO OFDM are some of the applications of code. This code is a class of forward error correction (FEC) technique that exhibits capacity of impending near Shannon's limit. LDPC codes are well identified for their capacity-approaching performance The LDPC codes have been selected as forward error correction in application including digital video broadcasting (DVBS2), 10 Gigabit Ethernet (10GBASE-T) broadband wireless access (Wi-Max), wireless local area network, deep-space communications.

Research paper thumbnail of An Efficient Approach for Squared Creast Factor Reduction in OFDM Systems Using Tone Reservation with Customized Convex Optimization

Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multipl... more Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. This scheme uses a number of sub-carriers and converts a frequency selective fading channel to a set of parallel flat fading channels. The OFDM signal is having a drawback that some signal values can be much higher than the average value. This results in high Squared Crest Factor (SCF). This paper deal with the Tone Reservation (TR) technique for reducing SCF. In this scheme few subcarriers are reserved to reduce the peak signal. These reserved carriers are called as Peak Reduction Carriers (PRCs) and these PRCs are used to reduce the SCF of the original signal. Similarly the Bit Error Rate also gets lowered. In contrast to previous methods, the TR method with Customized Convex Optimization implies a very quick convergence of minimum SCF and the bit error rate solution at a lower computational cost. The proposed method is compared with the SCF reduction techniques ...

Research paper thumbnail of “An Improved Conic Optimization Technique for PAPR Reduction with Less Processing Delay in OFDM Systems”

Orthogonal Frequency Division Multiplexing (OFDM), a digital multi-carrier modulation scheme, fin... more Orthogonal Frequency Division Multiplexing (OFDM), a digital multi-carrier modulation scheme, finds wide application in the field of digital communication in recent years. This physical layer standard is perhaps the most spectrally efficient method discovered so far, and it mitigates the severe problem of multipath propagation. But the high Peak-to-Average Power Ratio (PAPR) of OFDM signals has lead to deterioration in the performance of the system. Thus a number of techniques have been put forward to minimize the peak power. Of these, clipping and filtering (CF) is a very simple approach. In this paper, an improvement has been made to the classical method of iterative CF (ICF). The proposed method estimates the clipping level based on standard deviation of the available OFDM signal. And also the filter design is optimized using convex optimization techniques. Using this technique complementary cumulative distribution function (CCDF) curve shows a sharp and faster decay of PAPR to a...

Research paper thumbnail of “Performance Measure of Microstrip Antenna for Wearable Application”

Modern communication systems are driven by the concept of being connected anywhere and at any tim... more Modern communication systems are driven by the concept of being connected anywhere and at any time. Fuelled by the idea of a body-centric approach to modern communication technology, many research projects have been initiated to integrate antennas and radio frequency (RF) systems into clothes with regard to size reduction and cost effectiveness; so that the wearer may not notice the existence of these subsystems. Integrating antennas into fabrics is a potential way for facilitating many applications, such as health monitoring of patients, fire-fighting, rescue work, and space and military personal communications.The antenna designed for these applications should be flexible, lightweight and mechanically robust. The antenna structure is simple and looks like an adhesive bandage, and can be placed on human tissue.This paper presents a novel planar, via-free, printed antenna which looks like an adhesive bandage is designed on RT Duroid 5880 dielectric substrate. Later in order to desig...

Research paper thumbnail of Performance Analysis of Microstrip Antenna for On-Body Application

Research paper thumbnail of “An Iterative Statistical Dispersion Based Clipping and Conic Optimized Filtering for Swift Lowering of PAPR in OFDM Systems

European Journal of Scientific Research

Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme th... more Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme thus finds wide application in the field of digital communication in recent years. This physical layer standard is perhaps the most spectrally efficient method discovered so far, and it mitigates the severe problem of multipath propagation that causes massive data errors and loss of signal in the microwave and UHF spectrum. But the high Peak-to-Average Power Ratio (PAPR) of OFDM signals has lead to deterioration in the performance of the system. Thus a number of techniques have been put forward to minimize the peak power. Of these, clipping and filtering (CF) is a very simple approach. In this paper, an improvement has been made to the classical method of iterative CF (ICF). The proposed method estimates the clipping level based on standard deviation of the available OFDM signal. And also the filter design is optimized using convex optimization techniques. Using this technique complementar...

Research paper thumbnail of Power Reduction in OFDM Systems Using Tone Reservation with Customized Convex Optimization

Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multipl... more Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. This scheme uses a number of sub-carriers and converts a frequency selective fading channel to a set of parallel flat fading channels. The OFDM signal is having a drawback that some signal values can be much higher than the average value. This results in high Squared Crest Factor(SCF).This paper analyzes the Tone Reservation (TR) technique for SCF reduction. In this scheme, a small number of unused subcarriers called Peak Reduction Carriers (PRCs) are reserved to reduce the SCF and the goal of the TR scheme is to find the optimal values of the PRCs that minimize the SCF of the transmitted OFDM signal. Similarly the Bit Error Rate also gets lowered. In contrast to previous methods, the TR method with Customized Convex Optimization implies a very quick convergence of minimum SCF and the bit error rate solution at a lower computational cost. Also the effects of oversa...

Research paper thumbnail of Design and Analysis of Microstrip Antenna for Wearable Application

Modern communication systems are driven by the concept of being connected anywhere and at any tim... more Modern communication systems are driven by the concept of being connected anywhere and at any time. Fuelled by the idea of a body-centric approach to modern communication technology, many research projects have been initiated to integrate antennas and radio frequency (RF) systems into clothes with regard to size reduction and cost-effectiveness; so that the wearer may not notice the existence of these subsystems. Integrating antennas with electronics is a vital role for supporting many applications, biomedical, military and commercial fields. The antenna designed for these applications should be wideband, not sensitive to human body. The antenna structure is simple and looks like an adhesive bandage, and can be placed on human tissue. This paper presents a novel planar, via-free, printed antenna which looks like an adhesive bandage is designed on RT Duroid 5880 dielectric substrate. Later in order to design a flexible antenna, the antenna is designed on flexible substrates such as f...

Research paper thumbnail of Power optimization in OFDM systems using Customized Convex optimization in Clipping and Differential Scaling

In this paper, an efficient method for minimizing the high Peak to Average Power Ratio (PAPR), ba... more In this paper, an efficient method for minimizing the high Peak to Average Power Ratio (PAPR), based on Clipping and Differential Scaling, in Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. In this technique, the amplitude of complex OFDM signal is clipped and then scaled in such a way so that the PAPR is reduced without causing much degradation in bit error rate (BER). Convex Optimization technique is implemented to obtain the minimum value of PAPR. PAPR and BER of the system considered using simulations for QPSK constellation are presented.Performance of the proposed PAPR reduction technique with the performance of the existing techniques is also compared.

Research paper thumbnail of Oversampled convex optimized clipping technique for Squared Crest Factor (SCF) reduction in OFDM signal

2013 International Conference on Advanced Computing and Communication Systems, 2013

ABSTRACT There are numerous benefits in the transmission of a signal using Orthogonal Frequency D... more ABSTRACT There are numerous benefits in the transmission of a signal using Orthogonal Frequency Division Multiplexing (OFDM). They are high data rate, robust performance, high spectrum efficiency, etc., but high crest factor (cf), is the main drawback which minimises transmitter power efficiency and complexity in hardware implementation. The method used here is a concept of iterative standard deviation based clipping and optimized filtering. The proposed method shows a higher reduction in Squared Crest Factor and bit error rate with minimum number of iterations and reduced out-of-band distortion when compared over classical (ICF) methods. The effects of oversampling at l = 1,2,4,8 on the performance of proposed OFDM system is also discussed.

Research paper thumbnail of An Efficient Power Reduction Technique in Orthogonal Frequency Division Multiplexing System Using Tone Reservation

Journal of Computer Science, 2013

In a basic communication system, the data's are modulated onto a single carrier frequency. The av... more In a basic communication system, the data's are modulated onto a single carrier frequency. The available bandwidth is then totally occupied by each symbol. This kind of system can lead to Inter-Symbol-Interference (ISI) in case of frequency selective fading. The basic idea of Orthogonal Frequency Division Multiplexing (OFDM) is to divide the available spectrum into several orthogonal sub channels so that each narrowband sub channel experiences almost flat fading. In OFDM system, orthogonally placed sub-carriers are used to carry the data from the transmitter end to the receiver end. However, the major challenging issue is to reduce PAPR and Bit Error Rate (BER). The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). Tone reservation uses other unused or reserved tones to design a peakcancelling signal that lowers the PAR of a transmit OFDM block. Similarly it lowers the bit error rate. In contrast to previous methods, the tone reservation with convex optimization implies a very quick convergence of minimum-PAR and bit error rate solution at a lower computational cost. Also the effects of oversampling at l = 1,2,4,8 on the performance of proposed OFDM system is discussed.

Research paper thumbnail of An assiduous approach for power reduction in OFDM system using tone reservation

2013 International Conference on Advanced Computing and Communication Systems, 2013

ABSTRACT Orthogonal Frequency-Division Multiplexing (OFDM) is a method of digital modulation in w... more ABSTRACT Orthogonal Frequency-Division Multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. Here each sub-carrier is modulated with a conventional modulation scheme at a low symbol rate. The low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate intersymbol interference (ISI) and to improve signal-to-noise ratio. But the major challenging issue faced by the OFDM system is the reduction of Squared Crest Factor and Bit Error Rate. The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). Tone Reservation uses other unused or reserved tones to design a peak-cancelling signal that lowers the PAR of a transmit OFDM block. Similarly it lowers the bit error rate. In contrast to previous methods, the tone reservation with convex optimization implies a very quick convergence of minimum-PAR and bit error rate solution at a lower computational cost. Also the effects of oversampling at l = 1,2,4,8 on the performance of proposed OFDM system is discussed.

Research paper thumbnail of Peak Power Reduction through Conic Optimized Sigma Clipping and Filtering

Applied Mechanics and Materials, 2014

High Peak to Average Power Ratio (PAPR) of OFDM reduces transmitter power efficiency and increase... more High Peak to Average Power Ratio (PAPR) of OFDM reduces transmitter power efficiency and increases complexity in hardware implementation. In the paper, the high PAPR is reduced using optimized Standard Deviation based Iterative Clipping and Filtering (SD-ICF).The proposed method achieves a greater reduction in PAPR in a few iterations with reduced out-of-band distortion and bit error rate when compared over classical clipping techniques.Also, the effects of oversampling on the performance of proposed OFDM system is discussed.

Research paper thumbnail of PAPR Reduction of OFDM Signal via Custom Conic Optimized Iterative Adaptive Clipping and Filtering

Wireless Personal Communications, 2014

ABSTRACT High peak to average power ratio (PAPR) of OFDM reduces the transmitter power efficiency... more ABSTRACT High peak to average power ratio (PAPR) of OFDM reduces the transmitter power efficiency and increases the complication in hardware implementation. A number of techniques have been developed to minimize PAPR of OFDM. Among these techniques, iterative clipping and filtering (ICF) is an effective recent technique that produces significant results in minimizing PAPR. But, the major limitation of this approach is that it requires several iterations for minimizing PAPR. In order to overcome the above limitation, an optimization based ICF is used in this research work. An efficient custom optimized adaptive clipping and filtering technique is proposed. The proposed method shows a greater reduction in PAPR in lesser iterations with reduced out-of-band distortion and bit error rate when compared over classical clipping techniques. Moreover, the effects of oversampling on the performance of the proposed OFDM system are also evaluated.