Abstract

The main reason for the selection of single-carrier frequency division multiple access (SC-FDMA) modulation technique in mobile high data rate communications lays in its low value of peak-to-average power ratio (PAPR). If spatial modulation, a multiple-input multiple-output technique that achieves bitrate increase, is applied to the SC-FDMA system in its conventional form, the PAPR level is increased. Hence, based on previously mentioned, in this paper, we provide the general design criteria for low PAPR spatial modulation (LPSM) implemented in SC-FDMA systems with multiple transmit antennas. The straightforward generalization of LPSM is derived and it is shown that it requires the number of transmit antennas to be doubled in order to add another bit in the spatial component. Based on that, the alternative generalized technique with higher number of spatial bits is proposed. As these techniques present single-stream generalizations, the approach with multiple-streams is proposed as well. After PAPR and performance comparisons, it is concluded that single-stream techniques outperform multiple-stream techniques in the cases of low overall data rate, whereas multiple-stream approach is better in high overall data rate scenarios. All proposed techniques maintain low PAPR level on all transmit antennas.

中文翻译：

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用于SC-FDMA中低PAPR空间调制的多个发射天线：单流与多流

摘要

在移动高数据速率通信中选择单载波频分多址（SC-FDMA）调制技术的主要原因在于其峰均功率比（PAPR）较低。如果将空间调制（一种实现比特率增加的多输入多输出技术）以其传统形式应用于SC-FDMA系统，则PAPR级别会增加。因此，基于本文前面提到的内容，我们提供了在具有多个发射天线的SC-FDMA系统中实现的低PAPR空间调制（LPSM）的一般设计标准。得出了LPSM的直接概括，并表明它要求将发射天线的数量加倍，以便在空间分量中添加另一位。基于此，提出了一种具有较高空间位数的替代通用技术。由于这些技术呈现单流概括，因此也提出了具有多流的方法。经过PAPR和性能比较后，可以得出结论，在总体数据速率较低的情况下，单流技术要优于多流技术，而在总体数据速率较高的情况下，多流方法会更好。所有提出的技术在所有发射天线上均保持低PAPR电平。而在高整体数据速率情况下，多流方法更好。所有提出的技术在所有发射天线上均保持低PAPR电平。而在高整体数据速率情况下，多流方法更好。所有提出的技术在所有发射天线上均保持低PAPR电平。