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

Table 4

Computational complexity expressions for equalization matrix computation.

Approach	Number of real MULs
Joint Tx IQ + Ch.	43𝑁𝐷𝑁𝑇(−1+4(1+6𝑁𝑅)𝑁^2𝑇)
Sep. Tx IQ + Ch.	23𝑁𝐷𝑛𝑠(−2+12𝜅^2𝑁^2𝑅+8𝑛^2𝑠+3𝜅𝑁𝑅(16𝑛𝑠+𝑁𝑇))