Keynote-4

Keynote: Waste not, want not — using spectrum efficiently for low delay

Conference
8:30 AM — 9:30 AM CST
Local
Jul 28 Wed, 8:30 PM — 9:30 PM EDT

Keynote: Waste not, want not - using spectrum efficiently for low delay

Muriel Medard (MIT)

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High rates have been equated to low delay. We argue that this is too facile an equivalence, and also that it leads to replacing good engineering with more frequency. We provide two examples of such engineering choices and show that the new choices are both far simpler and far more effective than the traditional ones. The first is on error correcting decoding. Generally systems use codes that are much lower rate and far longer length than needed, even when adopting codes that are nominally capacity achieving. We show that even the simplest of codes, already in use for error detection, match or outperform current state of the art code constructions when decoded with a universal noise-centric decoding algorithm, GRAND (Guessing Random Additive Noise Decoding), co-developed with Ken Duffy. The second example shows that replacing hybrid ARQ and ARQ with RLNC (random linear network coding) can provide considerable delay gains. Such gains are even more marked when we use heterogeneous access technologies, such as WiFi with cellular systems.

Session Chair

Muriel Medard (MIT)

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