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首頁> 外文會議>International Conference on Wireless Communications and Signal Processing >Carrier frequency offset estimation scheme for quasi-constant envelope OFDM satellite system under AWGN channel
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Carrier frequency offset estimation scheme for quasi-constant envelope OFDM satellite system under AWGN channel

機(jī)譯：AWGN信道下準(zhǔn)恒定包絡(luò)OFDM衛(wèi)星系統(tǒng)的載波頻偏估計方案

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Quasi-Constant Envelope OFDM transmits dual-stream simultaneously to improve the spectral efficiency of Constant Envelope OFDM. It can provide high data rate links and maintain a low PAPR to reduce the distortion caused by the nonlinear power amplifier. Thus, the quasi-constant envelope OFDM is suitable for satellite communication system. However, the carrier frequency offset (CFO) in satellite communication must be estimated and compensated before the demodulation. In this paper a CFO estimation scheme is proposed for quasi-constant envelope OFDM satellite system under additive white Gaussian noise (AWGN) channel. Since the null subcarrier at the transmitter can be considered as the prior information at the receiver, this null subcarrier can be used to estimate the CFO through phase demodulator and inverse discrete Fourier transform (IDFT) module at the receiver. Mathematical analysis reveals that the ideal estimation range of normalized CFO is nearly half of the size of IDFT under AWGN channel. Simulation results show that the proposed scheme performs well at moderate and high signal-to-noise ratio (SNR) conditions.
機(jī)譯：準(zhǔn)恒定包絡(luò)OFDM同時傳輸雙流以提高恒定包絡(luò)OFDM的頻譜效率。它可以提供高數(shù)據(jù)速率鏈路并保持低PAPR，以減少非線性功率放大器引起的失真。因此，準(zhǔn)恒定包絡(luò)OFDM適合于衛(wèi)星通信系統(tǒng)。但是，必須在解調(diào)之前估算和補償衛(wèi)星通信中的載波頻率偏移（CFO）。本文提出了一種在加性高斯白噪聲（AWGN）信道下的準(zhǔn)恒定包絡(luò)OFDM衛(wèi)星系統(tǒng)的CFO估計方案。由于可以將發(fā)送器處的空子載波視為接收器處的先驗信息，因此可以使用該空子載波通過接收器處的相位解調(diào)器和逆傅立葉逆變換（IDFT）模塊來估計CFO。數(shù)學(xué)分析表明，在AWGN信道下，歸一化CFO的理想估計范圍幾乎是IDFT大小的一半。仿真結(jié)果表明，該方案在中等信噪比和高信噪比條件下表現(xiàn)良好。

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