1. An apparatus comprising: a processor configured to derive channel estimates for a wireless channel based on received pilot symbols and a single estimation parameter, and to update the single estimation parameter based on the received pilot symbols, wherein the single estimation parameter is for an innovations representation model of the wireless channel; and a memory coupled to the processor, wherein the processor is configured to derive predicted pilot symbols based on the received pilot symbols and the single estimation parameter, to determine prediction errors based on the received pilot symbols and the predicted pilot symbols, and to update the single estimation parameter based on the prediction errors, wherein the processor is configured to derive an error gradient for a current symbol period based on an error gradient for a preceding symbol period, and wherein the processor is configured to update the single estimation parameter for a current symbol period based on the single estimation parameter for a preceding symbol period.