Patent ID: 7813330
Filing Date: 2010-10-12
Classification: H04B,H04L

Abstract:
1. A gap filler apparatus for providing cyclic delay diversity in a digital multimedia broadcasting (DMB) system, comprising: a receiver for receiving an orthogonal frequency division multiplexing (OFDM) signal transmitted as a broadcasting signal; a symbol synchronization unit for acquiring symbol synchronization of the OFDM signal using a predetermined number of stored initial symbols of the OFDM signal, detecting a guard interval of an OFDM symbol using the symbol synchronization, determining a sample length by which the OFDM symbol is cyclic-delayed within the guard interval, storing a sample of the determined length from a symbol synchronization time, cyclic-delaying the OFDM signal by the determined sample length without the sample of the determined length, and adding the sample of the determined length to a last part of the cyclic-delayed OFDM symbol; an amplifier for amplifying the cyclic-delayed OFDM signal; and a transmitter for transmitting the amplified OFDM signal to a wireless network.