Frequency domain echo and next cancellation
US8743674B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2013 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Jan 28, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/32
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cancellation system is disclosed for processing incoming and outgoing signals in a transform domain to create a cancellation signal for reducing or removing unwanted interference. Data is ordered based on Good-Thomas indexing into a two dimensional array in a buffer. The two dimensional array may have lr rows and lw columns. From the buffer, the columns of data undergo a Winograd small transform. The rows of data undergo a Cooley-Tukey operation to complete the transform operation into the frequency domain. Multipliers scale the transformed data to generate a cancellation signal in the frequency domain. Inverse (Cooley-Tukey) and Winograd transforms perform inverse processing on the cancellation signal to return the cancellation signal or data to the time domain. Re-ordering the data and combination of the cancellation signal or data with incoming or outgoing signals achieve interference cancellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.