Method for adjusting FFT window of OFDM system

摘要

Disclosed is a method for adjusting FFT window of OFDM system. The method is categorized two scenarios when the maximum delay length of the channel is shorter than the guard interval length and when the maximum delay length of the channel is longer than the guard interval length. In respective scenarios, the method comprises steps: Step A, multiplying the guard interval (A1) damaged due to the path fading channel delay by a weighted value (α); Step B, multiplying the guard interval (A2) not damaged due to the path fading channel delay by a weighted value (1-α); and Step C, Adding the guard intervals of Step A and Step B together (A3) to be inputted into FFT; minimizing the inter-symbol interference, the inter-channel interference and the noise.

主权项

1. A method for adjusting a fast fourier transform (FFT) window in an orthogonal frequency division multiplexing (OFDM) system, comprising:
Step A, multiplying a guard interval damaged due to a path fading channel delay by a weighted value (α) when a maximum delay length of a channel is shorter than a guard interval length; Step B, multiplying a undamaged guard interval not damaged due to the path fading channel delay by a weighted value (1-α); and Step C, adding the guard interval of Step A and the undamaged guard interval of Step B together to be inputted into FFT.