A novel SNR estimation algorithm for OFDM

In this paper, we extend the traditional SNR estimation algorithms defined in complex AGWN channel to time variant linear channel and present a new SNR estimation algorithm for OFDM system. We compare our algorithm with two moment-based algorithms. Simulation results show that the new algorithm performs better in large Doppler frequency environments and is insensitive to the statistical characteristics of the channel.

I. Introduction

Several SNR estimation techniques have been proposed for the AWGN channel [1] [2] [5]. However, in mobile environments, both the amplitude and phase of the channel are time variant. The SNR estimation in such an environment is the focus of this paper.