IEEE Member-only icon Understanding Modulation to Mitigate Doubly Dispersive Channels – OTFS & Alternatives Understanding Modulation to Mitigate Doubly Dispersive Channels – OTFS & Alternatives

Understanding Modulation to Mitigate Doubly Dispersive Channels – OTFS & Alternatives

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This talk wants to show the general concept of creating the searched robustness, and some especially interesting alternatives to OTFS.

Due to an increase in bandwidth and carrier frequency, mobile communications channels can become doubly dispersive, i.e. in time and in frequency. The increase in carrier frequency at constant velocities of mobile terminals also reduces the coherence time.

This results in possibly reducing the chance of acquiring channel state information at the transmitter, and therefore using precoding techniques. Given these boundary conditions a modulation technique is to be found that is robust against doubly dispersive channels for transmitters without channel state information.

For this case, OTFS has been proposed, as it spreads information over time as well as over frequency. It therefore provides the resilience that is searched for. However, it is only a special case. 

This talk wants to show the general concept of creating the searched robustness and some especially interesting alternatives to OTFS.

Due to an increase in bandwidth and carrier frequency, mobile communications channels can become...

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