Joint timing offset, frequency offset, and channel estimation

Abstract

A receiver receives signals from a transmitter in subframes on subcarriers having orthogonal frequencies. A subset of the subframes include reference signals. The receiver generates a first channel estimate for a target subframe based on reference signals in the target subframe. The receiver also generates one or more second channel estimates for one or more other subframes based on one or reference signals in the other subframes. The receiver combines the first channel estimate and the one or more second channel estimates based on a frequency offset between the receiver and the transmitter to form a channel estimate of the target subframe. In some cases, the receiver performs joint estimates of a timing offset, a frequency offset, and a channel for the target subframe based on the reference signals, selected candidate timing offsets, selected candidate frequency offsets, and selected candidate channel estimates.