Single‐carrier frequency division multiple access (SC‐FDMA) is currently being used in long‐term evolution uplink communications owing to its low peak‐to‐average power ratio (PAPR). This study proposes a new transceiver design for an SC‐FDMA system based on Walsh‐Hadamard transform (WHT). The proposed WHT‐based SC‐FDMA system has low‐PAPR and better bit‐error rate (BER) performance compared with the conventional SC‐FDMA system. The WHT‐based SC‐FDMA transmitter has the same complexity as that of discrete Fourier transform (DFT)‐based transmitter, while the receiver's complexity is higher than that of the DFT‐based receiver. The exponential companding technique is used to reduce its PAPR without degrading its BER. Moreover, the performances of different ordered WHT systems have been studied in additive white Gaussian noise and multipath fading environments. The proposed system has been verified experimentally by considering a real‐time channel with the help of wireless open‐access research platform hardware. The supremacy of the proposed transceiver is demonstrated based on simulated and experimental results.

中文翻译：

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使用WARP硬件的基于Walsh-Hadamard变换的SC-FDMA系统

由于单载波频分多址（SC-FDMA）的峰均功率比（PAPR）低，因此目前正在长期演进的上行链路通信中使用。这项研究为基于Walsh-Hadamard变换（WHT）的SC-FDMA系统提出了一种新的收发器设计。与传统的SC-FDMA系统相比，基于WHT的SC-FDMA系统具有较低的PAPR和更好的误码率（BER）性能。基于WHT的SC-FDMA发射机与基于离散傅立叶变换（DFT）的发射机具有相同的复杂度，而接收机的复杂度高于基于DFT的接收机。指数压扩技术用于降低其PAPR而不会降低其BER。而且，在加性白高斯噪声和多径衰落环境中，研究了不同有序WHT系统的性能。在无线开放访问研究平台硬件的帮助下，通过考虑实时信道，对提出的系统进行了实验验证。基于仿真和实验结果证明了拟议中的收发器的至高无上性。