Apparatus and method of feedback cancellation for radio signal
US8364076B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 17, 2010 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Apr 8, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/15585
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A feedback signal cancellation apparatus includes a first RF receiver configured to down-convert a received RF signal to a predetermined frequency band, a subtractor configured to subtract a replica of a feedback signal from the down-converted signal, a transmission signal generator configured to generate a repeater output signal using a feedback cancelled signal, a RF transmitter configured to transmit the repeater output signal, a second RF receiver configured to down-convert a RF signal outputted from the RF transmitter to a predetermined frequency band, a reference signal generator configured to receive the RF signal and generate a reference signal having no DC pilot, and a replica generator configured to generate a filter coefficient using correlation between the feedback cancelled signal and the reference signal and to generate a replica of the feedback signal using the generated filter coefficient and the down-converted signal of the second RF receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.