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Reducing Error Vector Magnitude of OFDM Signals Using Threshold Vector Circle Method

机译:使用阈值向量圆法降低OFDM信号的误差矢量幅度

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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 EVM reduction method from geometric angle analysis is proposed which keeps the bit-error-rate (BER) performance after PAPR reduction. 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 10.56dB to 7.496dB with an EVM reduction of 2.34%. This technique should vastly improve the performance of OFDM signal in communication system.
机译:正交频分复用(OFDM)信号的主要缺点是高峰平均功率比(PAPR),其在高功率放大器(HPA)内的非线性存在下影响系统功率效率和系统性能。 错误矢量幅度(EVM)是OFDM系统中的通信标准的性能指标之一。 在本文中,提出了一种新的EVM减少方法,从几何角度分析中,在减少PAPR后保持误码率(BER)性能。 在我们的方法中,在频域中设计了一个阈值矢量圆,以便调整OFDM信号星座点的幅度和相位到靠近理想点。 仿真结果表明,QPSK调制OFDM信号的PAPR从10.56DB减少到7.496dB,EVM减少2.34%。 该技术应大大提高通信系统中OFDM信号的性能。

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