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#!/usr/bin/env python
from gnuradio import gr, blks2
from gnuradio.qtgui import qtgui
import scipy
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
sps = 2
excess_bw = 0.35
gray_code = True
fftsize = 2048
data = scipy.random.randint(0, 255, 1000)
src = gr.vector_source_b(data, True)
mod = blks2.dqpsk_mod(sps, excess_bw, gray_code, False, False)
rrctaps = gr.firdes.root_raised_cosine(1, sps, 1, excess_bw, 21)
rx_rrc = gr.fir_filter_ccf(sps, rrctaps)
thr = gr.throttle(gr.sizeof_gr_complex, 10*fftsize)
self.snk_tx = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS, -1/2, 1/2)
self.snk_rx = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS, -1/2, 1/2)
self.connect(src, mod, self.snk_tx)
self.connect(mod, rx_rrc, thr, self.snk_rx)
self.snk_tx.initialize()
qapp = self.snk_tx.get_qapplication()
self.snk_rx.initialize(qapp)
if __name__ == "__main__":
tb = my_top_block();
tb.start()
tb.snk_tx.start_app();
#tb.wait();
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