Method of adaptive modulation for cognitive radios using a fast and simplified modulation recognition
US8401117B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 2011 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Nov 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/0012
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Method for automatic modulation recognition in adaptive modulation based cognitive software defined radio (SDR), including receiving a transmitter signal from a transmitter; inputting signal data frame r(k), k=1, . . . , K; estimating SNR for data frame; feeding channel condition to transmitter; selecting one of plurality of predetermined modulation schemes from database; determining whether SNR(r(k))< or =threshold T(i); reporting failure if SNR(r(k))< or =T(i) and if not then estimating mean bj(i)(k) for r(k); calculating ∥r(k)−{circumflex over (b)}(i)(k)∥2; accumulating to calculaterepeating above steps from selecting for the other predetermined modulation schemes; finding minimumdetermining whether [K/SNR(r(k))−g(I)]<predetermined D; reporting the modulation scheme if determination is yes and failure if no. An SDR can be configured to perform the above method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.