Achievable Data Rate of Wideband OFDM With Data-Aided Channel Estimation

The achievable data rate of an OFDM system using data-aided channel estimation in the high bandwidth regime is evaluated under the assumption of a frequency selective, continuously fading channel. As previous results propose, the achievable data rate depends on the LMMSE channel estimate, for which a convenient representation is introduced here. The mean square estimation error is derived from this representation, allowing for an analysis with respect to the optimum amount and distribution of the pilot symbols in the wideband regime. The results on the data rate show good accordance to previous results based on non-data aided channel prediction especially in the interesting bandwidth range