6G (OTFS)

OTFS is now widely endorsed by the global research community, leading mobile operators and vendors as the foundation for 6G. Cohere has been working with Orthogonal Time Frequency and Space (OTFS) modulation since the inception of the company in 2011. Cohere built an end-to-end wireless OTFS system which demonstrated superior cellular performance – as tested with Telefonica in March 2018 where Cohere’s OTFS system demonstrated spectral efficiency of 57 b/s/Hz across 14 layers in a 90-degree sector. OTFS modulation is part of a larger mathematical theory of communication in the Delay Doppler domain (in contrast to the classical theory that uses the time frequency domain).

In 2018, Cohere decided to bring its innovation around the use of Delay Doppler-based channel detection, estimation and prediction, as well as precoding software to improve 4G and 5G wireless systems. This innovative technology is agnostic to any modulation scheme and is fully compliant with 3GPP. The pioneering work in the Delay Doppler domain enables robust channel estimation and accurate channel prediction into the future. It alleviates handset feedback requirements by leveraging geometric reciprocity and reduces computation complexity through concise channel representation. All of these features combine to deliver significant spectrum multiplier effect for 4G and 5G networks in both FDD and TDD.

Since 2011, Cohere’s innovations have resulted in over 100 patents for OTFS modulation, Delay Doppler channel modulation, distributed cloud functions and antenna designs.

Cohere will demonstrate a 6G system using the Orthogonal Time Frequency Space (OTFS) waveform and show 6G and 5G co-existence with OTFS and OFDM waveforms later this year (2022).