International Journal of Advanced Networking and Applications

Open Access Open Access  Restricted Access Subscription Access

Minimizing PAPR of OFDM Signal Using Discrete Cosine Transform and Log Companding


Affiliations
1 Department of Electrical and Electronic Engineering, Chukwuemeka Odumegwu Ojukwu University, Uli, Nigeria
2 Department of Electronic Engineering, University of Nigeria, Nsukka, Nigeria
 

This paper proposed precoding of OFDM signal using Discrete Cosine Transform (DCT) and adding of Log companding algorithm so as to reduce PAPR. Three scenarios were considered to fully examine the effect of PAPR in OFDM system based on simulations conducted in MATLAB environment while varying the number of subcarriers, N = 64 and 256. Initial simulation using conventional OFDM showed high PAPR in transmitted signal for N = 64 and 256, which resulted in PAPR of 9.741 and 11.41 dB respectively. In the second case, log companding technique was introduced into the OFDM and it was observed that PAPR was significantly reduced to 5.664 dB, and 6.101 dB by a percentage improvement of 41.9% and 46.5% for N = 64 and 256. For the proposed scheme, DCT scheme was used to initially precode the OFDM and a log companding algorithm applied, the results obtained indicated more than half level of reduction in PAPR of OFDM signal such that for N = 64 and 256 the PAPR was reduced to 4.214 dB and 4.743 dB, which corresponded to percentage improvement of 56.7% and 58.4% respectively.

Keywords

Discrete Cosine Transform, Log companding, OFDM, PAPR
User
Notifications
Font Size

  • M. Mounir, and M. B. El_Mashade, On the selection of the best companding technique for PAPR reduction in OFDM system. Journal of Information and Telecommunication, 3(3), 2019, 400-411.

  • B. C. Agwah, S. A. Akaneme, and C. A. Nwabueze, Application of DFT precoding with repeated clipping and filtering for minimizing peak to average power ratio in OFDM system. Iconic Research and Engineering Journals, 3(11), 2020, 265-273.

  • B. C. Agwah, C. A. Nwabueze, and S. A. Akaneme, Hybrid algorithm for optimizing peak to average power ratio performance in MIMO-OFDM system. World Journal of Engineering Research and Technology, 6(3), 2020, 625-640.

  • B. Ekengwu, N. Asiegbu, Muoghalu, C., and I. Ezeanya, improving peak to average power ratio of OFDM signal using DCT precoding with combined Distortion Techniques. International Journal of Progressive Sciences and Technologies, 23(1), 2020, 42-48.

  • L. Amhaimar, S. Ahyoud, A. Elyaakoubi, A. Kaabal, K. Attari, and A. Asselman, papr reduction using fireworks search optimization algorithm in MIMOOFDM systems. Hindawi, Journal of Electrical and Computer Engineering, 2018, 1-12.

  • L. Amhaimar, K. Attari, M. Halaoui, A. Elyaakoubi, S. Ahyoud, and A. Asselman, peak-to-average power ratio reduction using new swarm intelligence algorithm in OFDM systems. The 12th International Conference Interdisciplinary in Engineering, Procedia Manufacturing 32, 2019, 831-839.

  • K. Anoh, B. Adebisi, K. M. Rabie., and C. Tanriover, Root-based nonlinear companding technique for reducing papr of precoded OFDM Signals. IEEE Access, 6, 2017, 4618-4629. DOI 10.1109/ACCESS.2017.2779448

  • A. V. Manjula, and K. N. Muralidhara, PAPR reduction in ofdm systems using rcf and SLM techniques. International Journal of Computer Applications 158(6), 2017, 6-9.

  • S. Dubey, and R. Gupta, PAPR reduction in ofdm using precoding method, precoding with repeated clipping and filtering (RCF) method and precoding with clipping method. Advances in Computer Science and Information Technology (ACSIT), 3(3), 2016, 174-177.

  • M. Mounir, I. F. Tarrad, M. I. and Youssef, performance evaluation of different precoding matrices for PAPR reduction in OFDM systems, Internet Technology Letters, 1(70), 2018, 1-6. https://doi.org/10.1002/itl2.70

  • W. Yi, and G. linfeng, An investigation of peak-toaverage power reduction in MIMO-OFDM systems, Blekinge Institute of Technology.


Abstract Views: 118

PDF Views: 0




  • Minimizing PAPR of OFDM Signal Using Discrete Cosine Transform and Log Companding

Abstract Views: 118  |  PDF Views: 0

Authors

P. C. Odukwe
Department of Electrical and Electronic Engineering, Chukwuemeka Odumegwu Ojukwu University, Uli, Nigeria
C. B. Mbachu
Department of Electrical and Electronic Engineering, Chukwuemeka Odumegwu Ojukwu University, Uli, Nigeria
B. O. Ekengwu
Department of Electronic Engineering, University of Nigeria, Nsukka, Nigeria
D. K. Onebunne
Department of Electrical and Electronic Engineering, Chukwuemeka Odumegwu Ojukwu University, Uli, Nigeria

Abstract


This paper proposed precoding of OFDM signal using Discrete Cosine Transform (DCT) and adding of Log companding algorithm so as to reduce PAPR. Three scenarios were considered to fully examine the effect of PAPR in OFDM system based on simulations conducted in MATLAB environment while varying the number of subcarriers, N = 64 and 256. Initial simulation using conventional OFDM showed high PAPR in transmitted signal for N = 64 and 256, which resulted in PAPR of 9.741 and 11.41 dB respectively. In the second case, log companding technique was introduced into the OFDM and it was observed that PAPR was significantly reduced to 5.664 dB, and 6.101 dB by a percentage improvement of 41.9% and 46.5% for N = 64 and 256. For the proposed scheme, DCT scheme was used to initially precode the OFDM and a log companding algorithm applied, the results obtained indicated more than half level of reduction in PAPR of OFDM signal such that for N = 64 and 256 the PAPR was reduced to 4.214 dB and 4.743 dB, which corresponded to percentage improvement of 56.7% and 58.4% respectively.

Keywords


Discrete Cosine Transform, Log companding, OFDM, PAPR

References