Transmitter time-domain estimation and compensation of IQ imbalance
US10389561B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2017 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | Sep 8, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2671
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A zero-IF transceiver includes a Rx having an IQ receiver path with a digital portion including a modem and a down-converter, and a Tx having an IQ transmit path with a digital portion including a modem for generating a complex and substantially balanced time-domain signal, an IQMM correction block, and an up-converter. An IQMM estimation block is coupled between time-domain parts of the Rx and the Tx modems. The IQMM estimation block is coupled to an input of the IQMM correction block. A loopback path couples the time-domain signal from the Tx to the Rx. The IQMM estimation block receives a first time-domain signal from the Rx modem and the time-domain signal before the IQMM correction block, and estimates in a digital time-domain an IMage Rejection Ratio (IMRR) of the Tx(ϑ). The IQMM correction block is for correcting the IQMM to provide an IQ corrected OFDM signal using the ϑ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.