An iterative CFO estimator for QO-STBC uplink MC-CDMA MIMO systems

摘要

The combination of multiple-input multiple-output (MIMO) and multicarrier code-division multiple-access (MC-CDMA) is a more powerful solution of the physical layer for high-speed wireless communications [1]. However, such a hybrid scheme suffers from the unfavorable effects inherited from MC-CDMA systems. For instance, carrier frequency offset (CFO) [2] is commonly caused either by the mismatch of local oscillator frequency between the transmitter and receiver or the Doppler shift resulting from a user's mobility. Inevitably, CFO destroys the orthogonality of subcarriers and leads to system performance degradation if no countermeasure is adopted.