diff options
| author | Ben Reynwar <ben@reynwar.net> | 2011-01-01 15:31:55 -0700 |
|---|---|---|
| committer | Ben Reynwar <ben@reynwar.net> | 2011-01-01 15:31:55 -0700 |
| commit | 493cd2e48eee4850f2ceef20c9dd487b93ea6b9e (patch) | |
| tree | d6bdc30566e7a90f7ea3a553a0037ea9d41c3e06 /gnuradio-core/src/python/gnuradio/blks2impl/qam.py | |
| parent | ee21aaed629cfe9cec2e561c0e3d10374ec80e29 (diff) | |
Worked on generic demodulation.
Diffstat (limited to 'gnuradio-core/src/python/gnuradio/blks2impl/qam.py')
| -rw-r--r-- | gnuradio-core/src/python/gnuradio/blks2impl/qam.py | 49 |
1 files changed, 14 insertions, 35 deletions
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/qam.py b/gnuradio-core/src/python/gnuradio/blks2impl/qam.py index 9da7ca58ed..22d80503b4 100644 --- a/gnuradio-core/src/python/gnuradio/blks2impl/qam.py +++ b/gnuradio-core/src/python/gnuradio/blks2impl/qam.py @@ -32,19 +32,6 @@ from gnuradio.blks2impl.generic_mod_demod import generic_mod, generic_demod # default values (used in __init__ and add_options) _def_constellation_points = 16 -_def_samples_per_symbol = 2 -_def_excess_bw = 0.35 -_def_verbose = False -_def_log = False - -# Frequency correction -_def_freq_alpha = 0.010 -# Symbol timing recovery -_def_timing_alpha = 0.100 -_def_timing_beta = 0.010 -_def_timing_max_dev = 1.5 -# Fine frequency / Phase correction -_def_phase_alpha = 0.1 def is_power_of_four(x): v = log(x)/log(4) @@ -146,11 +133,7 @@ def make_constellation(m): class qam_mod(generic_mod): - def __init__(self, constellation_points=_def_constellation_points, - samples_per_symbol=_def_samples_per_symbol, - excess_bw=_def_excess_bw, - verbose=_def_verbose, - log=_def_log): + def __init__(self, constellation_points=_def_constellation_points, *args, **kwargs): """ Hierarchical block for RRC-filtered QAM modulation. @@ -174,10 +157,13 @@ class qam_mod(generic_mod): raise ValueError("number of constellation points must be a power of four.") points = make_constellation(constellation_points) - constellation = gr.gr_constellation(points) + side = int(sqrt(constellation_points)) + assert(side * side == constellation_points) + width = 2.0/(side-1) + constellation = gr.constellation_sector(points, side, side, width, width) + #constellation = gr.constellation(points) - super(qam_mod, self).__init__(constellation, samples_per_symbol, - excess_bw, verbose, log) + super(qam_mod, self).__init__(constellation, *args, **kwargs) def add_options(parser): """ @@ -195,15 +181,7 @@ class qam_mod(generic_mod): class qam_demod(generic_demod): - def __init__(self, constellation_points=_def_constellation_points, - samples_per_symbol=_def_samples_per_symbol, - excess_bw=_def_excess_bw, - freq_alpha=_def_freq_alpha, - timing_alpha=_def_timing_alpha, - timing_max_dev=_def_timing_max_dev, - phase_alpha=_def_phase_alpha, - verbose=_def_verbose, - log=_def_log): + def __init__(self, constellation_points=_def_constellation_points, *args, **kwargs): """ Hierarchical block for RRC-filtered QAM modulation. @@ -232,12 +210,13 @@ class qam_demod(generic_demod): """ points = make_constellation(constellation_points) - constellation = gr.gr_constellation(points) + side = int(sqrt(constellation_points)) + assert(side * side == constellation_points) + width = 2.0/(side-1) + constellation = gr.constellation_sector(points, side, side, width, width) + #constellation = gr.constellation(points) - super(qam_demod, self).__init__(constellation, samples_per_symbol, - excess_bw, freq_alpha, timing_alpha, - timing_max_dev, phase_alpha, verbose, - log) + super(qam_demod, self).__init__(constellation, *args, **kwargs) def add_options(parser): """ |