METHOD AND APPARATUS FOR ROBUST TWO-STAGE OFDM CHANNEL ESTIMATION

摘要

Methods, apparatuses, and systems for improved channel estimation in an Orthogonal Frequency Division Multiplexing (OFDM) system are discussed. In one example discussed herein, joint two-dimensional Minimum Mean-Square Error (2D-MMSE) channel estimation is performed on any Resource Element (REs) containing a reference signal in a Resource Block (RB), one-dimensional Minimum Mean-Square Error (1D-MMSE) channel estimation is performed in the frequency domain on each OFDM symbol in the RB, and then channel estimation is performed in the time domain on each frequency sub-carrier in the RB. In another example discussed herein, Power Delay Profiles (PDPs) and/or frequency correlations are calculated using minimax optimization and then stored in a Look-Up Table (LUT) indexed by estimated Signal to Noise Ratio (SNR) and the estimated maximum delay spread. A portable device could use such an LUT in MMSE calculations.

主权项

1. A method for a receiver to estimate one or more conditions of a channel upon which the receiver receives Orthogonal Frequency Division Multiplexing (OFDM) signals, comprising:
performing joint two-dimensional Minimum Mean-Square Error (2D-MMSE) channel estimation on any Resource Element (RE) containing a reference signal in a received resource block (RB); using data at least from the joint 2D-MMSE channel estimation of the reference signal REs, performing one-dimensional Minimum Mean-Square Error (1D-MMSE) channel estimation in the frequency domain on each OFDM symbol in the received RB; and using data at least from the 1D-MMSE channel estimation in the frequency direction, performing channel estimation in the time domain on each frequency sub-carrier in the received RB.