Variable modulus mechanism for performing equalization without a priori knowledge of modulation type or constellation order
US8611410B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2010 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Oct 3, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system, method and memory medium for performing blind equalization. A block {un} of the baseband samples is received. A function J of a vector f is minimized to determine a minimizer fMIN. The function J depends on vector f according to J(f)=Σ(|yn|2−γ)2. The summation Σ corresponds to a sequence {yn} of equalized samples. The sequence {yn} of equalized samples is related to the block {un} according to a convolution relation {yn}={un}*f. Parameter γ is a current modulus value. The current modulus value γ is updated to equal a ratio of a fourth moment of the sequence {yn} to a second moment of the sequence {yn}. The minimization and parameter update operations are repeated for a series of received blocks of baseband samples. The minimizer fMIN from a last of the repetitions is used to determine final equalized samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.