Auxiliary Factor Method to Remove ISI of Nyquist Filters

As has been known, the Nyquist first condition promises the zero-intersymbol (ISI) performance as derived in the frequency domain. However, the practical implementation using the FIR filter truncates the Fourier transformation by its window and, thus, prevents the mathematical calculation from reaching the ideal solution at zero-ISI. For obtaining better results, an increase in the window's length is required in general. To address this problem, a new approach is created by using auxiliary factors (AFs) to compensate shortcoming of the truncated Fourier transformation and nullify completely the ISI, regardless of the window's length. In addition, the performance in the presence of the timing jitter is also improved significantly. The closed-form solution of the AFs is derived and the effectiveness is confirmed by the simulation results. Finally, the problems of the transmission delay and additional calculation complexity are analysed.