Techniques for channel estimation, DC-offset compensation, and link quality control in Bluetooth system

This paper presents a channel estimation and a DC-offset estimation techniq ues, and two error control method in a short-ranged Bluetooth system. Each of the Bluetooth devices in the connection state knows the access codes use d in the ad-hoc networks, which is utilized as a reference signal for the p arameter estimation. Also, the access correlation output can help the error correction schemes of the Bluetooth networks because the correlation outpu t reflects the channel radio environments. The proposed estimators can be i mplemented without degradation of frame and spectral efficiency thanks to u sing the access code specified for the Bluetooth system.