Reducing error vector magnitude of OFDM signals using threshold vector circle method

Jingqi Wang; Qingqing Wu; Dong Wang; Chunlei Zhang; Wen Wu

doi:10.1117/12.2262936

7 October 2016 Reducing error vector magnitude of OFDM signals using threshold vector circle method

Jingqi Wang, Qingqing Wu, Dong Wang, Chunlei Zhang, Wen Wu

Proceedings Volume 9902, Fourth International Conference on Wireless and Optical Communications; 990211 (2016) https://doi.org/10.1117/12.2262936
Event: Fourth International Conference on Wireless and Optical Communications, 2016, Beijing, China

Abstract

The main disadvantage of Orthogonal Frequency Division Multiplexing (OFDM) signal is the high peak-to-average power ratio (PAPR) which influences the system power efficiency and system performance in the presence of nonlinearities within the high power amplifier (HPA). The error vector magnitude (EVM) is one of the performance metrics by communications standards in OFDM system. In this paper, a novel PAPR reduction method from geometric angle analysis is proposed which keeps the EVM and bit-error-rate (BER) performance. In our method, a threshold vector circle is designed in frequency domain in order to adjust the amplitude and phase of the OFDM signal constellation points to near the ideal points. Simulation results show that PAPR of a QPSK modulated OFDM signal is reduced from 10.98dB to 7.502dB with an EVM reduction of 2.57%. This technique should vastly improve the performance of OFDM signal in communication system.

Citation Download Citation

Jingqi Wang, Qingqing Wu, Dong Wang, Chunlei Zhang, and Wen Wu "Reducing error vector magnitude of OFDM signals using threshold vector circle method", Proc. SPIE 9902, Fourth International Conference on Wireless and Optical Communications, 990211 (7 October 2016); https://doi.org/10.1117/12.2262936

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