Adaptive Phase Optimized CA-OFDM with Deep Learning Aided Symbol Recovery for PAPR Reduction in Wireless Communications

In this paper, an Adaptive Phase Optimized ConstantAmplitude OFDM (APO-CA-OFDM) system with deep learning-aided symbol recovery has been proposed to reduce the peak-to-average power ratio (PAPR) in OFDM-based wireless communication systems. The proposed method decomposes the OFDM signal into two constant-amplitude signals and applies adaptive phase optimization and clipping to control signal peaks. Simulation results over AWGN and Rayleigh fading channels demonstrate that the proposed system achieves significant PAPR reduction while maintaining reliable BER performance. Additionally, the use of a low-pass filter effectively suppresses out-of-band emissions. Overall, the proposed APO-CA-OFDM scheme provides improved power efficiency and reliable communication performance compared with conventional OFDM methods.

[1]      W. Y. Zou and Y. Wu, ‘‘COFDM: An overview,’’ IEEE Trans. Broadcast., vol. 41, no. 1, pp. 1-8, Mar. 1995. [2]      H. Yang, ‘‘A road to future broadband wireless access: MIMO-OFDMbased air interface,’’ IEEE Commun. Mag., vol. 43, no. 1, pp. 53-60, Jan. 2005. [3]      S. Nakahara, M. Okano, M. Takada, and T. Kuroda, ‘‘Digital transmission scheme for ISDB-T and reception characteristics of digital terrestrial television broadcasting system in Japan,’’ IEEE Trans. Consum. Electron., vol. 45, no. 3, pp. 563-570, Aug. 1999. [4]      D. J. Deng, Y. P. Lin, X. Yang, J. Zhu, Y. B. Li, J. Luo and K. C. Chen, ‘‘IEEE 802.11ax: highly efficient WLANs for intelligent information infrastructure,’’ IEEE Commun. Mag., vol. 55, no. 12, pp. 52-59, Dec. 2017. [5]      A. A. Zaidi, R. Baldemair, V. Moles-Cases, N. He, K. Werner, and A. Cedergren, ‘‘OFDM numerology design for 5G new radio to support IoT, eMBB, and MBSFN,’’ IEEE Commun. Mag., vol. 2, no. 2, pp. 78-83, June 2018. [6]      H. Ochiai and H. Imai, ‘‘On the distribution of the peakto-average power ratio in OFDM signals,’’ IEEE Trans. Commun., vol. 49, no. 2, pp. 282-289, Feb. 2001. [7]      R. Kumari and M. Chawla, ‘‘Review of PAPR reduction techniques for 5G system,’’ International Journal of Electronics and Communication Engineering, vol. 10, no. 1, pp. 35-44, Nov. 2017. [8]      Y. Rahmatallah and S. Mohan, ‘‘Peak-to-average power ratio reduction in OFDM systems: A survey and taxonomy,’’ IEEE Communications Surveys & Tutorials, vol. 15, no. 4, pp. 1567-1592, Mar. 2013. [9]      K. R. Panta and J. Armstrong, ‘‘Effect of clipping on the error performance of OFDM in frequency selective fading channels,’’ IEEE Trans. Wireless Commun., vol. 3, no. 2, pp. 668-671, Mar. 2004. [10] D. Kim, D. Shi, Y. Park, and B. Song, ‘‘New peakwindowing for PAPR reduction of OFDM systems,’’ Proc. Asia-Pacific Conference on Wearable Computing Systems (APWCS), pp. 169-173, Aug. 2005.