Signal construction, detection and estimation techniques for use in uplink timing synchronization and access control in an orthogonal frequency division multiplexed wireless system or other type of wireless communication system. Using a tunable laser in combination with a group velocity dispersive element, laser tuning is used to create the desired amount of optical delay. The method includes the steps of electronically receiving a data file from a sender, the data file comprising one or more addresses, and determining whether the addresses can be validated with a first weekly file comprising extended delivery codes and a second weekly file comprising delivery point verifications. The handle slides along the adjusting slot to adjust angle and height of a saw blade of the sawing controller. The apparatus further includes a 2D coordinate translation component.