diff options
| -rw-r--r-- | gnuradio-core/src/python/gnuradio/blks2impl/dbpsk2.py | 27 |
1 files changed, 11 insertions, 16 deletions
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/dbpsk2.py b/gnuradio-core/src/python/gnuradio/blks2impl/dbpsk2.py index a692e7d1f..b2cc27854 100644 --- a/gnuradio-core/src/python/gnuradio/blks2impl/dbpsk2.py +++ b/gnuradio-core/src/python/gnuradio/blks2impl/dbpsk2.py @@ -26,7 +26,7 @@ differential BPSK modulation and demodulation. """ from gnuradio import gr, gru, modulation_utils -from math import pi, sqrt +from math import pi, sqrt, ceil import psk import cmath from pprint import pprint @@ -86,8 +86,6 @@ class dbpsk2_mod(gr.hier_block2): if not isinstance(self._samples_per_symbol, int) or self._samples_per_symbol < 2: raise TypeError, ("sbp must be an integer >= 2, is %d" % self._samples_per_symbol) - ntaps = 11 * self._samples_per_symbol - arity = pow(2,self.bits_per_symbol()) # turn bytes into k-bit vectors @@ -103,16 +101,15 @@ class dbpsk2_mod(gr.hier_block2): self.chunks2symbols = gr.chunks_to_symbols_bc(psk.constellation[arity]) - # pulse shaping filter - self.rrc_taps = gr.firdes.root_raised_cosine( - self._samples_per_symbol, # gain (samples_per_symbol since we're - # interpolating by samples_per_symbol) - self._samples_per_symbol, # sampling rate - 1.0, # symbol rate - self._excess_bw, # excess bandwidth (roll-off factor) + nfilts = 32 + ntaps = nfilts * 11 * self._samples_per_symbol # make nfilts filters of ntaps each + self.rrc_taps = gr.firdes.root_raised_cosine( + nfilts, # gain + nfilts, # sampling rate based on 32 filters in resampler + 1.0, # symbol rate + self._excess_bw, # excess bandwidth (roll-off factor) ntaps) - self.rrc_filter = gr.interp_fir_filter_ccf(self._samples_per_symbol, - self.rrc_taps) + self.rrc_filter = gr.pfb_arb_resampler_ccf(self._samples_per_symbol, self.rrc_taps) # Connect self.connect(self, self.bytes2chunks, self.symbol_mapper, self.diffenc, @@ -244,16 +241,14 @@ class dbpsk2_demod(gr.hier_block2): self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100) #self.agc = gr.feedforward_agc_cc(16, 1.0) - # Frequency correction self.freq_recov = gr.fll_band_edge_cc(self._samples_per_symbol, self._excess_bw, - 11*self._samples_per_symbol, + 11*int(self._samples_per_symbol), self._freq_alpha, self._freq_beta) - # symbol timing recovery with RRC data filter nfilts = 32 - ntaps = 11 * samples_per_symbol*nfilts + ntaps = 11 * int(self._samples_per_symbol*nfilts) taps = gr.firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(self._samples_per_symbol), self._excess_bw, ntaps) |