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| Content Provider | ACM Digital Library |
|---|---|
| Author | Halperin, Daniel Wetherall, David Hu, Wenjun Sheth, Anmol |
| Abstract | RSSI is known to be a fickle indicator of whether a wireless link will work, for many reasons. This greatly complicates operation because it requires testing and adaptation to find the best rate, transmit power or other parameter that is tuned to boost performance. We show that, for the first time, wireless packet delivery can be accurately predicted for commodity 802.11 NICs from only the channel measurements that they provide. Our model uses 802.11n Channel State Information measurements as input to an OFDM receiver model we develop by using the concept of effective SNR. It is simple, easy to deploy, broadly useful, and accurate. It makes packet delivery predictions for 802.11a/g SISO rates and 802.11n MIMO rates, plus choices of transmit power and antennas. We report testbed experiments that show narrow transition regions (<2 dB for most links) similar to the near-ideal case of narrowband, frequency-flat channels. Unlike RSSI, this lets us predict the highest rate that will work for a link, trim transmit power, and more. We use trace-driven simulation to show that our rate prediction is as good as the best rate adaptation algorithms for 802.11a/g, even over dynamic channels, and extends this good performance to 802.11n. |
| Starting Page | 159 |
| Ending Page | 170 |
| Page Count | 12 |
| File Format | |
| ISSN | 01464833 |
| DOI | 10.1145/1851275.1851203 |
| Journal | ACM SIGCOMM Computer Communication Review (CCRV) |
| Volume Number | 40 |
| Issue Number | 4 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 1993-07-01 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Fading Link adaptation Rssi Wireless 802.11n Effective snr Rate adaptation Ofdm Power control Snr Mimo |
| Content Type | Text |
| Resource Type | Article |
| Subject | Computer Networks and Communications Software |
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