From f1c41f807cb29472d0924149e39d6ec8ad90e6a2 Mon Sep 17 00:00:00 2001
From: eb <eb@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Wed, 27 Sep 2006 05:14:03 +0000
Subject: Merged changes from eb/digital-wip into trunk.
This includes:
* renaming gnuradio-examples/python/gmsk2 to gnuradio-examples/python/digital
* refactoring the digital data tx and rx test code into benchmark_tx
and benchmark_rx. These accept a -m <modulation> argument.
<modulation> can currently be selected from gmsk, dbpsk, dqpsk
* Two new AGC blocks: gr_agc2: separate attack and delay rates;
gr_feedforward_agc: FIR-ish compressor. Normalizes to peak envelope.
* Working DBPSK mod/demod (works fine)
* Working DQPSK mod/demod (works, but still needs more work)
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3662 221aa14e-8319-0410-a670-987f0aec2ac5
---
.../python/digital/limbo/qpsk_usrp_tester.py | 103 +++++++++++++++++++++
1 file changed, 103 insertions(+)
create mode 100644 gnuradio-examples/python/digital/limbo/qpsk_usrp_tester.py
(limited to 'gnuradio-examples/python/digital/limbo/qpsk_usrp_tester.py')
diff --git a/gnuradio-examples/python/digital/limbo/qpsk_usrp_tester.py b/gnuradio-examples/python/digital/limbo/qpsk_usrp_tester.py
new file mode 100644
index 0000000000..bf7698a2b2
--- /dev/null
+++ b/gnuradio-examples/python/digital/limbo/qpsk_usrp_tester.py
@@ -0,0 +1,103 @@
+#!/usr/bin/env python
+
+import random
+from gnuradio import gr, gru, usrp
+
+default_access_code = '\xAC\xDD\xA4\xE2\xF2\x8C\x20\xFC'
+
+def string_to_1_0_list(s):
+ r = []
+ for ch in s:
+ x = ord(ch)
+ for i in range(8):
+ t = (x >> i) & 0x1
+ r.append(t)
+
+ return r
+
+def to_1_0_string(L):
+ return ''.join(map(lambda x: chr(x + ord('0')), L))
+
+code = string_to_1_0_list(default_access_code)
+
+access_code = to_1_0_string(code)
+
+def main():
+
+ fg = gr.flow_graph()
+ f_rf = 5e6
+ fs = 400e3
+ sr = 100e3
+ alpha = 0.5
+ M = 4
+ k = int(gru.log2(M))
+
+ # Source
+ src = usrp.source_c ()
+ adc_rate = src.adc_rate()
+ usrp_decim = int(adc_rate / fs)
+ src.set_decim_rate(usrp_decim)
+
+ subdev_spec = usrp.pick_rx_subdevice(src)
+ subdev = usrp.selected_subdev(src, subdev_spec)
+ print "Using RX d'board %s" % (subdev.side_and_name(),)
+ src.set_mux(usrp.determine_rx_mux_value(src, subdev_spec))
+ src.tune(0, subdev, f_rf)
+
+ g = subdev.gain_range()
+ subdev.set_gain(g[1])
+ subdev.set_auto_tr(True)
+
+ print "USRP Decimation Rate = %d" % usrp_decim
+ print "RF Frequency = %d" % f_rf
+
+ agc = gr.multiply_const_cc(0.0025)
+
+ # Downconverter
+ costas_alpha=0.005
+ beta = costas_alpha*costas_alpha*0.25
+ sync_loop = gr.costas_loop_cc(costas_alpha, beta, 0.05, -0.05, 0)
+
+ # Stage 2
+# fs2 = 200e3
+# D = int(fs / fs2)
+# decimator = gr.keep_one_in_n(gr.sizeof_gr_complex, D)
+# print "D = %d\nAfter decimator fs = %f" % (D, fs2)
+
+ # Demodulator
+ taps = gr.firdes.root_raised_cosine(1, fs, sr, alpha, 45)
+ rrc = gr.fir_filter_ccf(1, taps)
+
+ # Sampler
+ mu = 0.01
+ omega = 4.3
+ gain_mu = 0.05
+ gain_omega = 0.25*gain_mu*gain_mu
+ omega_rel_limit = 0.5
+ clock_sync = gr.clock_recovery_mm_cc(omega, gain_omega, mu,
+ gain_mu, omega_rel_limit)
+ clock_sync.set_verbose(False)
+
+ diff_phasor = gr.diff_phasor_cc()
+
+ threshold = 12
+ constellation = (1+0j, 0+1j, -1+0j, 0-1j)
+ slicer = gr.constellation_decoder_cb((constellation), (0,1,2,3))
+ unpack = gr.unpack_k_bits_bb(k)
+ access = gr.correlate_access_code_bb(access_code,threshold)
+
+ test = gr.file_sink(gr.sizeof_gr_complex, 'test.dat')
+ sink = gr.file_sink(gr.sizeof_char, 'output.dat')
+
+ fg.connect(src, agc, sync_loop, rrc, clock_sync)
+ fg.connect(clock_sync, diff_phasor, slicer, unpack, access, sink)
+
+ fg.connect(slicer, gr.file_sink(gr.sizeof_char, 'chunks.dat'))
+ fg.connect(unpack, gr.file_sink(gr.sizeof_char, 'unpack.dat'))
+ fg.connect(clock_sync, gr.file_sink(gr.sizeof_gr_complex, 'phasor.dat'))
+
+ fg.start()
+ fg.wait()
+
+if __name__ == "__main__":
+ main()
--
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