Frame Detection For Synchronization In OFDM

Orthogonal frequency division multiplexing (OFDM) is a parallel transmission scheme for transmitting data at very high rates over time dispersive radio channels and sub carriers are used to carry that data. These subcarriers are orthogonal to each other. In an OFDM system, frame synchronization and frequency-offset estimation are extremely important for maintaining orthogonality among these subcarriers. The Frame detection is the task of finding an approximate estimate of the start of the preamble of an incoming packet. As such it is the first synchronization algorithm that is performed, so the rest of the synchronization process is dependent on good packet detection performance. By using Xilinx software and verilog coding, in this paper the problem of frame detection is considered. Keywords—Narrow band interference (NBI), Fast Fourier Transform (FFT), Inter Block Interference (IBI),Inter-carrier interference(ICI),Carrier Frequency Offset(CFO).