Research on Orthogonal Time Frequency Space in a 125-GHz mmWave Indoor Wireless Communication System
Mingxu Wang, Jianjun Yu, Xianming Zhao, Wen Zhou, Jiali Chen, Xiongwei Yang, Chengzhen Bian, Yi Wei, Qiutong Zhang, Yang Han, Peng Tian, Sicong Xu, Qinyi Zhang, Luhan Jiang, Uddin Rahim, Kaihui Wang, Weiping Li
Abstract
We provide a detailed comparison between orthogonal time frequency space (OTFS) and orthogonal frequency division multiplexing (OFDM) modulation schemes, focusing on peak-to-average power ratio (PAPR), spectral efficiency (SE), and resistance to frequency dispersion. First experimental research of OTFS is achieved in a photonics-aided D-band indoor wireless communication system. We compare the performance of OTFS and OFDM schemes in real frequency-selective (static) and partially emulated doubly-selective (mobile) channels, using the same experimental setup and indoor environment. OTFS scheme exhibits superior bit error rate (BER) performance and >2 dB power sensitivity improvement over OFDM in both static and mobile channels. Moreover, due to the reduction in overheads, OTFS-4QAM achieves a SE of 2 bit/s/Hz, which is 15% higher than that of OFDM-4QAM. The improvement in SE of OTFS supports the transmission of massive amounts of data for future indoor wireless networks.