Software for signal correction in frequency domain by using the fast Fourier transform

In this work we described and compared a few algorithms for signal correction based on the fast Fourier transform (FFT) and signal correction in frequency domain that was performed by computer techniques and statistical simulation methods. By taking into account two different approaches for packet assembly, we analyzed two different methods for signal correction. First, was ification method, and second was mean square fault minimization method. The first approach applies passive guard interval, while the second is based on using cyclic prefix. Both methods were realized by software for simulation of wireless channel with required parameters. We present results of researches of signal noise immunity under following conditions: transmission over single-beam channel, transmission over dual-beam channels without both correction, correction based on mean square fault minimization, and correction based on ification algorithm with unequal beam ratios in noisy channel. We obtained bit-error relations on signal-to-noise ratio under different channel conditions, and present conclusions based on these results.