FAST FOURIER TRANSFORM WINDOW CONTROL METHOD IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM CAPABLE OF REDUCING NOISE POWER

摘要

PURPOSE: An FFT(Fast Fourier Transform) window control method in an OFDM(Orthogonal Frequency Division Multiplexing) system is provided to minimize performance degradation by minimizing interference between an adjacent channel and an adjacent symbol.;CONSTITUTION: When the maximum delay distance of a channel is shorter than a protection section, a damaged protection section(A1) is multiplied by a weighted value(α) by delaying a path fading channel. A section(A2) in which does not receive damage from a path fading channel is multiplied by another weighted value(1-α). The multiplied values are added from each other. The added values(A3) are inputted to FFT.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Protection section; (BB) Received symbol; (CC) FFT input