Hi you! >Any pointer on where should I make the change? Yes. Do it before preambling! The inverse dft is a linear operation; it doesn't really matter whether you scale before or after. Note though that the IFFT as we use it adds a sqrt(length_of_fft) factor, so account for that by dividing your scaling factor by it.
Greetings, Marcus On 16.10.2014 13:35, zealdeal wrote: > Hi All, > > I need to scale down the OFDM transmission signal in time domain, after IFFT > is done, so that, all the values are within the range -1 to 1. But, I cant > simply add one more "scaling" block after cp_adder in > > self.connect(self.preambles, self.ifft, self.cp_adder, self.scale, self) > (file: ofdm,py) > > as it will scale down the preamble also, leading to non-recognition of > packet at receiver end. > > Any pointer on where should I make the change? > > > > -- > View this message in context: > http://gnuradio.4.n7.nabble.com/Scaling-down-IFFT-values-tp50833.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
