Hi, For a single carrier system, rooted raised cosine pulse shaping filter is generally used in both transmitting and receiving. I have read a paper which said the FFT bin outside of signal plus excessive bandwidth were set to zero to suppress aliasing signal component. I find that in frequency selective fading channels, suppress aliasing signal component does give better performance for ZF or MMSE equalizer than that without suppressing. In AWGN channel, this will worsen the performance in contrast. I think this is because suppress aliasing component will distort signal. The above facts are right? My second thought is that simply suppress some frequency component without using windowing will generate Gibbson effect. I want to know if there are some better method in simulation, or in field implementation? In simulation, it is necessary to use low pass filter to suppress aliasing component? Or, simply to chose a high order RRC filter? For me, RC (or RRC) looks like a special low pass filter. Thanks in advance
Question about aliasing spectrum in RC filter
Started by ●February 25, 2006
Reply by ●February 25, 20062006-02-25