# Simplified Frequency Offset Estimation for MIMO OFDM Systems

## TL;DR

This paper proposes a simplified and efficient frequency offset estimator for MIMO OFDM systems that leverages Chu sequences and factor decomposition, achieving reduced complexity and confirmed by simulation results.

## Contribution

It introduces a novel simplified CFO estimation method for MIMO OFDM systems using Chu sequences and derivative-based factor decomposition, reducing computational complexity.

## Key findings

- Estimator achieves low mean-squared error in simulations
- Training-assisted approach improves estimation accuracy
- Method demonstrates good performance over frequency selective channels

## Abstract

This paper addresses a simplified frequency offset estimator for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems over frequency selective fading channels. By exploiting the good correlation property of the training sequences, which are constructed from the Chu sequence, carrier frequency offset (CFO) estimation is obtained through factor decomposition for the derivative of the cost function with great complexity reduction. The mean-squared error (MSE) of the CFO estimation is derived to optimize the key parameter of the simplified estimator and also to evaluate the estimator performance. Simulation results confirm the good performance of the training-assisted CFO estimator.