mimo ofdm channel estimation,I/q imbalance&MMSe ca
2016-08-23
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recent years, direct conversion receiver has drawn a lot of attention due to
its low power consumption and low implementation cost. However some mismatches
in direct conversion receiver can seriously degrade the system performance, such
as in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset
(CFO). The I/Q imbalance is due to the amplitude and phase mismatches between
the I and Q-branch of the local oscillator whereas the CFO is due to the
mismatch of carrier frequency at the transmitter and receiver. It is known that
the I/Q imbalance and CFO can cause a serious inter-carrier interference (ICI)
in orthogonal frequency division multiplexing (OFDM) systems. As a result, the
bit error rate (BER) has an error-flooring. In assuming that the channel
frequency response is smooth, a frequency-domain estimation method h
matlab
计算
估计
信道
MMSE
MIMOOFDM
失衡
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