Recently, the wireless communication system development driven by the ongoing Industry 4.0 (I40) and Industrial Internet of Thing (IIoT) has been growing enormously. In industrial automation and manufacturing, closed-loop control applications are commonly used, which require completely new solutions to achieve ultra high reliability and have stringent requirements on message timing and repetitive packet losses. A novel hardware-based enhanced preamble-aided OFDM frame detection and frequency offset estimation aiming at the high reliability and low packet loss rate is introduced in this work. With the introduced carrier frequency offset estimation, key highlights of our work are a) multi-user support, b) low hardware overhead, and c) lower packet loss rate.