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OFDM Based on Low Complexity Transform to Increase Multipath Resilience and Reduce PAPR

机译:基于低复杂度变换的OFDM,可提高多径弹性并降低PAPR

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This paper introduces a new multicarrier system using a low computational complexity transform that combines the Walsh-Hadamard transform (WHT) and the discrete Fourier transform (DFT) into a single fast orthonormal unitary transform. The proposed transform is used in a new orthogonal frequency division multiplexing ( ${rm T}$-OFDM) system, leading to a significant improvement in bit error rate (BER) and reasonable reduction in the peak-to-average power ratio (PAPR). Use of the proposed transform with OFDM has been found to attain high frequency diversity gain by combining all data samples resulting in the transmission over many subcarriers. Consequently, the detrimental effect arising from channel fading on the subcarrier power is minimized. Theoretical analysis of the uncoded ${rm T}$-OFDM performance over additive white Gaussian noise (AWGN), flat fading, quasi-static (fixed within the entire period of OFDM symbol transmission) frequency selective fading channel models with zero-forcing (ZF) and minimum mean square error (MMSE) equalizers is presented in this work. Moreover, the low superposition of the subcarriers passing through the ${rm T}$-transforms leads to a reduction in the high peak of the transmitted signal whilst preserving the average transmitted power and data rate. Analytical results confirmed by simulations demonstrated that the proposed ${rm T}$-OFDM system achieves lower PAPR and the same BER over AWGN and flat fading channels. Compared to OFDM, ${rm T}$-OFDM is found to have better BER when MMSE equalizer is used, but slightly worse when ZF equalizer is used.
机译:本文介绍了一种使用低计算复杂度变换的新型多载波系统,该系统将Walsh-Hadamard变换(WHT)和离散傅立叶变换(DFT)组合为单个快速正交normal变换。所提出的变换用于新的正交频分复用( $ {rm T} $ -OFDM)系统,显着改善了误码率(BER),并合理降低了峰均功率比(PAPR)。已经发现,通过将所有数据样本进行组合,从而导致在许多子载波上进行传输,可以将提议的OFDM变换用于高频分集增益。因此,由信道衰落引起的对子载波功率的有害影响被最小化。对未编码的 $ {rm T} $ -OFDM在加性高斯白噪声(AWGN),平坦衰落,在这项工作中,提出了具有零强迫(ZF)和最小均方误差(MMSE)均衡器的准静态(固定在OFDM符号传输的整个周期内)频率选择性衰落信道模型。此外,通过 $ {rm T} $ -变换的子载波的低叠加会导致高在保持平均发射功率和数据速率的同时,发射信号的峰值。通过仿真证实的分析结果表明,所提出的 $ {rm T} $ -OFDM系统可实现较低的PAPR和相同的BER AWGN和平坦衰落信道。与OFDM相比,发现 $ {rm T} $ -使用MMSE均衡器时,OFDM具有更好的BER,但略有降低使用ZF均衡器时更糟。

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