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Flexible Multi-Group Single-Carrier Modulation: Optimal Subcarrier Grouping and Rate Maximization

机译:灵活的多组单载波调制:最佳子载波   分组和速率最大化

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摘要

Orthogonal frequency division multiplexing (OFDM) and single-carrierfrequency domain equalization (SC-FDE) are two commonly adopted modulationschemes for frequency-selective channels. Compared to SC-FDE, OFDM generallyachieves higher data rate, but at the cost of higher transmit signalpeak-to-average power ratio (PAPR) that leads to lower power amplifierefficiency. This paper proposes a new modulation scheme, called flexiblemulti-group single-carrier (FMG-SC), which encapsulates both OFDM and SC-FDE asspecial cases, thus achieving more flexible rate-PAPR trade-offs between them.Specifically, a set of frequency subcarriers are flexibly divided intoorthogonal groups based on their channel gains, and SC-FDE is applied over eachof the groups to send different data streams in parallel. We aim to maximizethe achievable sum-rate of all groups by optimizing the subcarrier-groupmapping. We propose two low-complexity subcarrier grouping methods and show viasimulation that they perform very close to the optimal grouping by exhaustivesearch. Simulation results also show the effectiveness of the proposed FMG-SCmodulation scheme with optimized subcarrier grouping in improving the rate-PAPRtrade-off over conventional OFDM and SC-FDE.
机译:正交频分复用(OFDM)和单载波频域均衡(SC-FDE)是选频信道的两种常用调制方案。与SC-FDE相比,OFDM通常可实现更高的数据速率,但代价是发射信号的峰均功率比(PAPR)更高,从而导致功率放大器效率降低。本文提出了一种新的调制方案,称为灵活多组单载波(FMG-SC),该方案将OFDM和SC-FDE的特殊情况封装在一起,从而在它们之间实现了更灵活的速率-PAPR权衡。频率子载波根据其信道增益灵活地划分为正交组,并且在每个组上应用SC-FDE以并行发送不同的数据流。我们旨在通过优化子载波组映射来最大化所有组的可实现总和。我们提出了两种低复杂度的子载波分组方法,并通过仿真显示它们通过穷举搜索的效果非常接近最佳分组。仿真结果还表明,与传统的OFDM和SC-FDE相比,带有优化的子载波分组的FMG-SC调制方案在改善速率-PAPR折衷方面的有效性。

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