%0 Journal Article %A Dajie JIANG %A Dong WANG %A Fanggang WANG %A Pu YUAN %A Xiran LI %T Orthogonal Time Frequency Space Modulation in Multiple-Antenna Systems %D 2021 %R 10.12142/ZTECOM.202104008 %J ZTE Communications %P 71-78 %V 19 %N 4 %X

The application of the orthogonal time frequency space (OTFS) modulation in multiple-antenna systems is investigated. The diversity and/or the multiplexing gain can be achieved by deploying various multiple-antenna techniques, and thus the reliability and/or the spectral efficiency are improved correspondingly. We provide two classes of OTFS-based multiple-antenna approaches for both the open-loop and the closed-loop systems. Specifically, in the open-loop system, a transmitting diversity approach, which resembles the space-time coding technique, is proposed by allocating the information symbols appropriately in the delay-Doppler domain. In the closed-loop system, we adopt the Tomlinson-Harashima precoding in our derived delay-Doppler equivalent transmission model. Numerical evaluations demonstrate the advantages of applying the multiple-antenna techniques to the OTFS. At last, several challenges and opportunities are presented.

%U http://zte.magtechjournal.com/EN/10.12142/ZTECOM.202104008