CHANNEL AND NOISE ESTIMATION FOR DOWNLINK LTE

摘要

Systems, methods, and instrumentalities for a WTRU to perform channel estimation and/or noise estimation are provided. The techniques described herein may be used to perform channel estimation and/or noise estimation that meet certain performance and latency goals while utilizing a lower cost design than previous channel/noise estimation techniques. For example, the channel estimation/noise estimation techniques described herein may be implemented using less memory (e.g., less memory for storing filter coefficients) while still achieving the desired latency and performance goals. The techniques described herein may be implemented by any WTRU and/or by a WTRU specifically designed to be low-cost.

主权项

1. A method of performing channel estimation in a wireless transmit/receive unit (WTRU), the method comprising:
receiving, via a receiver, a downlink Orthogonal Frequency Division Multiplexing (OFDM) signal; determining one or more Cell-Specific Reference Signal (CRS) symbols from the OFDM signal; determining a mid-point resource element (RE) in time-domain (TD mid-point RE) using CRS from at least two of the one or more CRS symbols; determining a mid-point resource element (RE) in frequency-domain (FD mid-point RE) using a multiple-tap sinc filter, the FD mid-point RE being based on at least one of the one or more CRS symbols that aligns with the TD mid-point RE; determining a weighted average of the TD mid-point RE and the FD mid-point RE, the weighted average being a two-domain (2-D) mid-point RE; and performing channel estimation based, at least in part, on the 2-D mid-point RE.