SloMo: Downclocking WiFi Communication

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" summary

Proposes downclocking 802.11b reception and transmission by exploiting DSSS sparsity with compressive sensing and custom shortened chip sequences, implemented on Microsoft Sora. Prototype operates at 1–2 Mbps legacy rates, reduces the radio clock rate by 5x in some modes, and achieves 30–34% energy savings on apps (up to 25%–34% per trace, 3% for full‑bandwidth video). Backwards compatible with standard APs, incurs up to ~13% airtime overhead and modest frame loss at very low SNRs, and succeeds across microbenchmarks and smartphone trace evaluations.

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" chapters (14)

1. 0:00SloMo and WiFi energy
2. 1:56Why WiFi energy saving hard
3. 4:02Energy saving opportunities
4. 5:48Downclocking with compressive sensing
5. 9:44SloMo implementation and backward compat
6. 10:26Downclocked reception results
7. 11:28Downclocked transmission results
8. 12:30Energy savings in apps
9. 14:56Real-time apps energy efficiency
10. 15:38High data rate limits
11. 16:21Trade-offs and airtime overhead
12. 17:49Comparison with E-MiLi benefits
13. 18:31Conclusion and future apps
14. 18:52Q&A