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A new two-dimensional modulation technique called Orthogonal Time Frequency Space (OTFS) modulation designed in the delay-Doppler domain is introduced. Through this design, which exploits full diversity over time and frequency, OTFS coupled with equalization converts the fading, time-varying wireless channel experienced by modulated signals such as OFDM into a time-independent channel with a complex channel gain that is roughly constant for all symbols. Thus, transmitter adaptation is not needed. This extraction of the full channel diversity allows OTFS to greatly simplify system operation and significantly improves performance, particular in systems with high Doppler, short packets, and large antenna arrays. Simulation results indicate at least several dB of block error rate performance improvement for OTFS over OFDM in all of these settings. In addition these results show that even at very high Dopplers (500 Km/h), OTFS approaches channel capacity through linear scaling of throughput with the MIMO order, whereas the performance of OFDM under typical design parameters breaks down completely.

Notas/Comentarios de José A. Delgado-Penín:
Artículo donde se presenta por primera vez un esquema de modulación/demodulación bidimensional para radiocomunicaciones móviles con fuerte presencia de efecto Doppler. Se aprovechan las diversidades en tiempo y frecuencia de un radiocanal en situación de posible movilidad del transmisor y receptor. Se aprovecha a su vez el uso de técnicas MIMO con dicho esquema de transmisión. Ya se usa en Radiocomunicaciones 5G en bandas milimétricas y su posible uso en redes 6G.


  • Autor/es: R.Hadani; S.Rakib; M.Tsatsanis; A.Monk; A.J.Goldsmith; A.F.Molisch; R.Calderbank.
  • Fecha: 2017-03
  • Publicado en: 2017 IEEE Wireless Communications and Networking Conference (WCNC), 19-22 March 2017.
  • Idioma: Inglés
  • Formato: PDF
  • Contribución: José Antonio Delgado-Penín.
  • Palabras clave: Proceso de señal, Tecnología de comunicaciones

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