Rate adaptation using error vector magnitude
US7826521B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2007 |
| Grant date | Nov 2, 2010 |
| Priority date | — |
| Expiry date | Jun 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0003
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Rate adaptation is accurately provided by using an average SNR technique, a predicted PER technique, or an EVM to PER mapping technique. An average SNR is computed by averaging EVM values in a particular domain. Using the computed average SNR, an optimized rate is determined. The predicted PER technique includes computing EVM values for a current packet, determining an average BER using these EVM values for each data rate, determining an average SNR from this average BER, using the average SNR and a PER versus SNR curve to determine the predicted PER for each data rate, and using a data rate and the predicted PER to compute the predicted throughput for that data rate. In the last technique, an EVM is mapped to a packet error rate (PER) for each data rate. A throughput is computed for each data rate and PER. A data rate with a high throughput is selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.