Research Article

Efficient Joint Estimation and Compensation of CFO, Tx/Rx Frequency-Selective I/Q Imbalance, and the MIMO Radio Channel in OFDM Systems

Table 1

Abbreviations in simulation results.

Abbreviation Meaning

SCH1 The closed form based joint estimation scheme in Section 4
SCH2 The iterative joint estimation scheme in Section 5
SEP1 For SCH1: estimation of using LSE, that is, applying (24)
SEP2 For SCH1: estimation of using LMMSE, that is, applying (25)
R For SCH2: apply the real-valued Rx-I/Q-imbalance compensation structure (Section 5.2)
C For SCH2: apply the complexed valued Rx-I/Q-imbalance compensation structure as in The appendix
INTP1 For SCH1/SCH2: using the MLE in (28) or (48), respectively
INTP2 For SCH1/SCH2: using the LMMSE in (29) or (49), respectively
Hsu, S The scheme in [15], with a preamble of length 800
Hsu, L The scheme in [15], with a much longer preamble