Efficient Design of Selective Mapping and Partial Transmit Sequence Using T-OFDM
Efficient Design of Selective Mapping and Partial Transmit Sequence Using T-OFDM
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DOI：
10.1109/tvt.2019.2928361
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发表时间：
2020-03
影响因子：
6.8
通讯作者：
Mohammed Shweesh Ahmed;S. Boussakta;A. Al-Dweik;B. Sharif;C. Tsimenidis
中科院分区：
文献类型：
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作者：
Mohammed Shweesh Ahmed;S. Boussakta;A. Al-Dweik;B. Sharif;C. Tsimenidis
选择性映射（SLM）和部分发射序列（PTS）是缓解正交频分复用（OFDM）信号固有的峰值功率的有吸引力的方案。然而，高计算复杂度和冗余侧信息（SI）位已被确定为这种技术的主要限制。高计算复杂度主要是由于需要执行多次快速傅立叶反变换（ifft）和在发射端进行相位优化处理。因此，本文提出了使用低复杂度t变换而不是IFFT的新的SLM和PTS设计。使用t变换与SLM实现了相当大的计算复杂度和峰值平均功率比（PAPR）的降低。此外，我们将t变换应用于PTS，并推导出两种不同的配置，以折衷SI要求和PAPR降低。所有的方案都不影响OFDM信号的原始功率谱。复杂性分析表明，与传统方案相比，本文提出的方案具有较低的复杂性。此外，仿真结果表明，由于t变换引入的频率分集，所提出的方案对多径传播引起的色散具有弹性。
Selective mapping (SLM) and partial transmit sequence (PTS) are attractive schemes for mitigating the high peak power inherent in orthogonal frequency division multiplexing (OFDM) signals. However, the high computational complexity and redundant side information (SI) bits have been identified as the main limitations for such techniques. The high computational complexity is mainly due to the need to perform several inverse fast Fourier transforms (IFFTs), and phase optimization process at the transmitter side. Therefore, this paper presents new SLM and PTS designs using a low complexity T-transform rather than IFFT. The use of the T-transform with SLM achieves a considerable computational complexity and peak-to-average power ratio (PAPR) reduction. Furthermore, we apply the T-transform to PTS and derive two different configurations that compromise the SI requirements and PAPR reduction. All the proposed schemes do not affect the original power spectrum of OFDM signals. The complexity analysis show that the proposed schemes have much lower complexity as compared to conventional schemes. Moreover, simulation results demonstrate that the proposed schemes are resilient to dispersion arising from multipath propagation, which is due to the frequency diversity introduced by the T-transform.