Carrier Frequency Offset in Coordinated Multibase MIMO Narrowband Systems

The effect of carrier frequency offset (CFO) in a coordinated multibase MIMO downlink system is considered. We begin with evidence that uncompensated base station (BS) CFOs can significantly reduce the achievable capacity of such systems. Correction of the CFOs is desirable, and a critical step in doing so is estimation of their values. We present a method by which mobile subscribers (MSs) can estimate multiple CFOs from training sequences received from the BSs. Compared to existing estimators, the proposed estimator gives better accuracy with a lower transmit power.