I guess I may have a misunderstanding on the usage of firdes.root_raised_cosine (double gain, double sampling_freq, double symbol_rate, double alpha, int ntaps) function.
In the flowgraph, the parameters are set up as follows: samp_rate = 32k; upsampling_rate (sps) = 4; # of pylyphase filter in Polyphase Clock Sync block nfilts = 32; ntaps = 11*4*32; If I set the gain as 1.0/float(sps) = 1.0/4.0, the rrc_taps for Polyphase Clock Sync should be (equation 1): firdes.root_raised_cosine (1.0/4.0, 32000, 32000/4, 0.35, 11*4*32). However, in the wiki example mpsk_stage4 ( https://raw.githubusercontent.com/gnuradio/gr-tutorial/master/examples/tutorial7/mpsk_stage4.grc ) ), it is set up as (equation 2): firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), 0.35, 11*sps*nfilts), which works great for the mpsk_stage4.grc. Could somebody explain why this rrc_taps shouldn't be as in equation 1? Thank you.
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
