Low-Mobility Channel Tracking for MIMO-OFDM Communication Systems
It is now well understood that by exploiting the available additional spatial dimensions, Multiple-Input Multiple-Output (MIMO) communication systems provide capacity gains, compared to a Single-Input Single-Output systems without increasing the overall transmit power or requiring additional bandwidth. However, these large capacity gains are feasible only when the perfect knowledge of the channel is available to the receiver. Consequently, when the channel knowledge is imperfect, as is common in practical settings, the impact of the achievable capacity needs to be evaluated. In this paper, the authors begin with a general MIMO framework at the outset and specialize it to the case of Orthogonal Frequency Division Multiplexing (OFDM) systems by decoupling channel estimation from data detection.