Channel Estimation and Feedback in OFDM Systems

This paper presents a novel time-domain parameter (TDP) extraction scheme for channel estimation and feedback in the LTE-advanced systems. The TDP extraction improves the channel estimation accuracy by an order of magnitude over the interpolation-based methods, has extremely low complexity compared to MMSE approaches, and is very close to or even outperforms the Bayesian MMSE lower bound. The mobile device feeds back the extracted TDPs instead of the complex amplitudes of the channel at reference signal (RS) subcarriers, reducing the feed-back overhead by an order of magnitude and making possible for implementation of CoMP, a key feature in the LTE-advanced.