发明名称 |
I/Q calibration of transmit and receive paths in OFDM FDD communication systems |
摘要 |
I/Q gain and phase mismatches of both transmit and receive paths of an OFDM FDD transceiver are simultaneously estimated. An up-converted RF signal is generated when the transmit path performs IQ modulation on a reference signal having a single sideband tone. The up-converted RF signal is sent via a loop-back path to the receive path. A down-converted evaluation signal is generated when the receive path performs IQ demodulation on the up-converted RF signal. The single evaluation signal is used to determine the transmit path gain and phase mismatches and the receive path gain and phase mismatches. The four I/Q mismatches are estimated without using significant hardware nut otherwise used in the regular transmission of data signals. The I/Q mismatches in data signals are corrected by pre-processing the up-converted RF signals and post-processing the down-converted RF signals by adding attenuated components of the in-phase and quadrature-phase signals to each other.
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申请公布号 |
US8135055(B2) |
申请公布日期 |
2012.03.13 |
申请号 |
US20080182333 |
申请日期 |
2008.07.30 |
申请人 |
KOHLMANN MICHAEL;QUALCOMM INCORPORATED |
发明人 |
KOHLMANN MICHAEL |
分类号 |
H04B3/46 |
主分类号 |
H04B3/46 |
代理机构 |
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主权项 |
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地址 |
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