Title :
Rayleigh fading compensation for 16QAM using FFT
Author :
Okamoto, Eiji ; Li, Huan-Bang ; Ikegami, Tetsushi
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Kanagawa, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
Pilot symbol-assisted modulation (PSAM) has been proposed to overcome the Rayleigh fading. However, as the fading rate becomes more rapid, it is difficult to provide an exact interpolation with conventional PSAM. To compensate for the fast Rayleigh fading, a PSAM which calculates in the frequency domain rather than the time domain as in conventional PSAM is proposed. Although this PSAM scheme only needs the zero interpolation for fading estimation, it provides a very accurate estimate even in relatively fast Rayleigh fading environments. We introduce this PSAM using fast Fourier transform (FFT) and apply it to 16QAM and then show some results of computer simulations
Keywords :
Rayleigh channels; fast Fourier transforms; frequency-domain analysis; interpolation; land mobile radio; quadrature amplitude modulation; 16QAM; BER; FFT; PSAM; Rayleigh fading compensation; computer simulations; fading estimation; fading rate; fast Fourier transform; fast Rayleigh fading; frequency domain; land mobile communications; pilot symbol-assisted modulation; quadrature amplitude modulation; zero interpolation; Bandwidth; Degradation; Digital communication; Fading; Fast Fourier transforms; Frequency domain analysis; Interpolation; Mobile communication; Quadrature amplitude modulation; Rayleigh channels;
Journal_Title :
Vehicular Technology, IEEE Transactions on
