A method of recovering a clock signal from a digital signal in a receiver includes generating a representation of an eye diagram from symbols of the digital signal, in which the symbols are sampled at a sample rate such that the representation of the eye diagram is generated by a plurality of samples. An aglet positioned on the string. The sensor feeds an array of band cut-off filters receiving each signals from said at least one sensor unit. Lower ends of the first to fourth lace sections are anchored on the shoe body. Moreover, it provides antenna diversity for both WLAN and Bluetooth systems, where in the prior-art WLAN and Bluetooth co-existence system only WLAN system has the antenna diversity.