Low-Cost High-Performance TDD Synchronizer for WiBro RF Repeater

Date Added: Aug 2010
Format: PDF

WiBro Radio Frequency (RF) repeater is used for solving the problem of partial shadow areas in the wireless communication field that uses Time-Division Duplexing (TDD) mode. In this paper, a method to efficiently generate TDD signals for WiBro RF repeater is proposed and its digital circuit is implemented. A TDD signal is detected from RF signals transmitted/received to/from RF repeater and then inputted again into the RF repeater, so that it can operate normally. First, the envelope of downlink signals is detected and then clamped to extract the basic form of a TDD signal using an operational amplifier circuit. Next, the TDD signal is generated by restoring and filtering the shape which has been distorted by the wireless channel.