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Home»Articles»An Efficient Approach of Peak to Average Power Ratio Reduction in OFDM Using CAP-PT Method

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Asian Journal of Electrical Sciences (AJES)

Editor Dr. Koray Ulgen
Print ISSN : 2249 - 6297
Frequency : Quarterly

An Efficient Approach of Peak to Average Power Ratio Reduction in OFDM Using CAP-PT Method

Author : C. Raja Rajeshwari and M. Rajkumari
Volume 1 No.1 January-June 2012 pp 40-44

Abstract

An Orthogonal Frequency Division Multiplexing (OFDM) system has been proposed as a standard for the mobile communication systems. Despite the advantages of OFDM signals like high spectral efficiency and robustness against ISI, the OFDM signals have some disadvantages which the main one is the high peak to average power ratio (PAPR). The reason of high PAPR is that in the time domain, the OFDM signal is actually sum of many narrowband signals. At some time instances, the sum of these narrowband signals may be large and at the other time may be small, which means that the peak of the signal is much larger than the average value. This high PAPR signal when transmitted through a nonlinear power amplifier creates spectral broadening and also an increase in the dynamic range of the digital to analog converter (DAC). The result will be an increase in the cost of the system and reduction in efficiency. Hence, the technique to overcome this problem in OFDM systems is necessary. The existing method doesn’t have high capability of PAPR reduction with significant high Bit Error Rate (BER) degradation. Hence this proposed CAP-PT (Clipping, Amplification and Peak Windowing/ Partial Transmit) method combines the effect of clipping the peak signals and amplifies the signals that have low amplitude. Out of band radiations which is caused by clipping is suppressed by peak windowing process. Then followed by partial transmit which reduces in band distortions. The PAPR reduces to the great extent without BER degradation. Simulation results demonstrate that the proposed CAP-PT method yields the better performance than the existing methods.

Keywords

OFDM, PAPR Reduction, Multicarrier Transmission, Clipping, Amplification, Peak Windowing, Partial Transmit

Full Text:

References

Asian Journal of Electrical Sciences (AJES) is a quarterly international peer-reviewed journal of Electrical Sciences. One of the objectives of this journal is to disseminate knowledge on various research issues connected with the topics include, but are not limited to:

Telecommunications – transmission of information, coax cable, optical fiber or free space, amplitude modulation and frequency modulation, transmitters and receivers, transceiver.
Instrumentation – pressure, flow and temperature, electromagnetic theory, thermocouples, sensors of larger electrical systems, control engineering.
Computers – Computers and computer systems, hardware, software, software engineering.

Power engineering – generation, transmission and distribution of electricity, transformers, electric generators, electric motors, high voltage engineering and power electronics.
Control engineering – dynamic systems, design of controllers, electrical circuits, digital signal processors, microcontrollers and PLCs (Programmable Logic Controllers), industrial automation. Electronic Engineering -Electronic circuits, resistors, capacitors, inductors, diodes and transistors, radio engineering, radar, television, audio systems, computers and microprocessors.
Microelectronics – Electronic circuit, integrated circuit, semiconductor transistors, resistors, capacitors, inductors, Nanoelectronics.

Signal processing – signals, analog, digital, telecommunications, Digital Signal Processing, SDTV | HDTV sets, radios and mobile communication devices, Hi-Fi audio equipments, Dolby noise reduction algorithms, GSM mobile phones, mp3 multimedia players, camcorders and digital cameras, automobile control systems, noise cancelling headphones, digital spectrum analyzers, intelligent missile guidance, radar, GPS based cruise control systems, image processing, video processing, audio processing and speech processing systems.

An Orthogonal Frequency Division Multiplexing (OFDM) system has been proposed as a standard for the mobile communication systems. Despite the advantages of OFDM signals like high spectral efficiency and robustness against ISI, the OFDM signals have some disadvantages which the main one is the high peak to average power ratio (PAPR). The reason of high PAPR is that in the time domain, the OFDM signal is actually sum of many narrowband signals. At some time instances, the sum of these narrowband signals may be large and at the other time may be small, which means that the peak of the signal is much larger than the average value. This high PAPR signal when transmitted through a nonlinear power amplifier creates spectral broadening and also an increase in the dynamic range of the digital to analog converter (DAC). The result will be an increase in the cost of the system and reduction in efficiency. Hence, the technique to overcome this problem in OFDM systems is necessary. The existing method doesn’t have high capability of PAPR reduction with significant high Bit Error Rate (BER) degradation. Hence this proposed CAP-PT (Clipping, Amplification and Peak Windowing/ Partial Transmit) method combines the effect of clipping the peak signals and amplifies the signals that have low amplitude. Out of band radiations which is caused by clipping is suppressed by peak windowing process. Then followed by partial transmit which reduces in band distortions. The PAPR reduces to the great extent without BER degradation. Simulation results demonstrate that the proposed CAP-PT method yields the better performance than the existing methods.

Editor-in-Chief
Dr. Koray Ulgen
Department of energy engineering, Ege University, Turkey
[email protected]
Editorial Advisory Board
Dr. Rasyidah Binti Mohamad Idris
Department of Electrical Power Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Norhaliza Abdul Wahab
Department of Control & Mechatronics Engineering, Universiti Teknologi Malaysia
[email protected]
Prof. Md Irfan Ahmed
Department of Electrical Engineering, Career Point University, Rajasthan, India
[email protected]
Dr. Sallehuddin Bin Ibrahim
Department of Control And Mechatronics Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Naziha bt. Ahmad Azli
Department of Electrical Power Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Sharul Kamal Bin Abdul Rahim
Department of Communication Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Jasrul Jamani Bin Jamian
Department of Electrical Power Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. T. Rajesh
Department of EEE, INFO Institute of Engineering, Coimbatore, India
[email protected]
Dr. Mohamad Kamal B. A. Rahim
Department of Communication Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Sophan Wahyudi Bin Nawawi
Department of Control and Mechatronics Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Nor Hisham Haji Khamis
Department of Communication Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Cheng Siong Lim
Department of Control and Mechatronic Engineering,Universiti Teknologi Malaysia
[email protected]
Dr. Sharifah Kamilah Bt Syed Yusof
Department of Electrical Engineering Universiti Teknologi Malaysia
[email protected]
Dr. Shahdan Sudin
Department of Control and Mechatronic Engineering, Universiti Teknologi Malaysia
[email protected]
Dr. Razali Bin Ngah
Department of Electrical Engineering, Universiti Teknologi Malaysia
[email protected]

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    Editorial Note

    Editorial Dr. Koray Ulgen

    Editor-in-Chief
    Dr. Koray Ulgen
    Department of energy engineering, Ege University, Turkey
    [email protected]
    Editorial Advisory Board
    Dr. Rasyidah Binti Mohamad Idris
    Department of Electrical Power Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Norhaliza Abdul Wahab
    Department of Control & Mechatronics Engineering, Universiti Teknologi Malaysia
    [email protected]
    Prof. Md Irfan Ahmed
    Department of Electrical Engineering, Career Point University, Rajasthan, India
    [email protected]
    Dr. Sallehuddin Bin Ibrahim
    Department of Control And Mechatronics Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Naziha bt. Ahmad Azli
    Department of Electrical Power Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Sharul Kamal Bin Abdul Rahim
    Department of Communication Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Jasrul Jamani Bin Jamian
    Department of Electrical Power Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. T. Rajesh
    Department of EEE, INFO Institute of Engineering, Coimbatore, India
    [email protected]
    Dr. Mohamad Kamal B. A. Rahim
    Department of Communication Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Sophan Wahyudi Bin Nawawi
    Department of Control and Mechatronics Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Nor Hisham Haji Khamis
    Department of Communication Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Cheng Siong Lim
    Department of Control and Mechatronic Engineering,Universiti Teknologi Malaysia
    [email protected]
    Dr. Sharifah Kamilah Bt Syed Yusof
    Department of Electrical Engineering Universiti Teknologi Malaysia
    [email protected]
    Dr. Shahdan Sudin
    Department of Control and Mechatronic Engineering, Universiti Teknologi Malaysia
    [email protected]
    Dr. Razali Bin Ngah
    Department of Electrical Engineering, Universiti Teknologi Malaysia
    [email protected]

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