diff options
Diffstat (limited to 'gr-digital/python/ofdm.py')
| -rw-r--r-- | gr-digital/python/ofdm.py | 82 |
1 files changed, 43 insertions, 39 deletions
diff --git a/gr-digital/python/ofdm.py b/gr-digital/python/ofdm.py index e05f074f47..2663f7cf87 100644 --- a/gr-digital/python/ofdm.py +++ b/gr-digital/python/ofdm.py @@ -21,31 +21,12 @@ # import math -from gnuradio import gr, ofdm_packet_utils, modulation_utils2 +from gnuradio import gr, ofdm_packet_utils import gnuradio.gr.gr_threading as _threading import psk, qam from gnuradio.blks2impl.ofdm_receiver import ofdm_receiver -def _add_common_options(normal, expert): - """ - Adds OFDM-specific options to the Options Parser that are common - both to the modulator and demodulator. - """ - mods_list = ", ".join(modulation_utils2.type_1_constellations().keys()) - print dir(modulation_utils2) - print "MODS LIST: ", mods_list - print modulation_utils2.type_1_mods() - normal.add_option("-m", "--modulation", type="string", default="psk", - help="set modulation type (" + mods_list + ") [default=%default]") - normal.add_option("-c", "--constellation-points", type="int", default=2, - help="set number of constellation points [default=%default]") - expert.add_option("", "--fft-length", type="intx", default=512, - help="set the number of FFT bins [default=%default]") - expert.add_option("", "--occupied-tones", type="intx", default=200, - help="set the number of occupied FFT bins [default=%default]") - expert.add_option("", "--cp-length", type="intx", default=128, - help="set the number of bits in the cyclic prefix [default=%default]") # ///////////////////////////////////////////////////////////////////////////// # mod/demod with packets as i/o @@ -81,9 +62,6 @@ class ofdm_mod(gr.hier_block2): self._occupied_tones = options.occupied_tones self._cp_length = options.cp_length - print (options) - arity = options.constellation_points - win = [] #[1 for i in range(self._fft_length)] # Use freq domain to get doubled-up known symbol for correlation in time domain @@ -104,10 +82,19 @@ class ofdm_mod(gr.hier_block2): symbol_length = options.fft_length + options.cp_length - print modulation_utils2.type_1_constellations - const = modulation_utils2.type_1_constellations()[self._modulation](arity).points() - - self._pkt_input = gr.ofdm_mapper_bcv(const, msgq_limit, + mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256} + arity = mods[self._modulation] + + rot = 1 + if self._modulation == "qpsk": + rot = (0.707+0.707j) + + if(self._modulation.find("psk") >= 0): + rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity]) + elif(self._modulation.find("qam") >= 0): + rotated_const = map(lambda pt: pt * rot, qam.constellation[arity]) + #print rotated_const + self._pkt_input = gr.ofdm_mapper_bcv(rotated_const, msgq_limit, options.occupied_tones, options.fft_length) self.preambles = gr.ofdm_insert_preamble(self._fft_length, padded_preambles) @@ -153,10 +140,14 @@ class ofdm_mod(gr.hier_block2): """ Adds OFDM-specific options to the Options Parser """ - _add_common_options(normal, expert) - for mod in modulation_utils2.type_1_mods().values(): - mod.add_options(expert) - + normal.add_option("-m", "--modulation", type="string", default="bpsk", + help="set modulation type (bpsk, qpsk, 8psk, qam{16,64}) [default=%default]") + expert.add_option("", "--fft-length", type="intx", default=512, + help="set the number of FFT bins [default=%default]") + expert.add_option("", "--occupied-tones", type="intx", default=200, + help="set the number of occupied FFT bins [default=%default]") + expert.add_option("", "--cp-length", type="intx", default=128, + help="set the number of bits in the cyclic prefix [default=%default]") # Make a static method to call before instantiation add_options = staticmethod(add_options) @@ -205,9 +196,6 @@ class ofdm_demod(gr.hier_block2): self._cp_length = options.cp_length self._snr = options.snr - arity = options.constellation_points - print("con points is %s" % options.constellation_points) - # Use freq domain to get doubled-up known symbol for correlation in time domain zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0)) ksfreq = known_symbols_4512_3[0:self._occupied_tones] @@ -223,11 +211,22 @@ class ofdm_demod(gr.hier_block2): self._occupied_tones, self._snr, preambles, options.log) - constell = modulation_utils2.type_1_constellations()[self._modulation](arity) + mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256} + arity = mods[self._modulation] + + rot = 1 + if self._modulation == "qpsk": + rot = (0.707+0.707j) + + if(self._modulation.find("psk") >= 0): + rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity]) + elif(self._modulation.find("qam") >= 0): + rotated_const = map(lambda pt: pt * rot, qam.constellation[arity]) + #print rotated_const phgain = 0.25 frgain = phgain*phgain / 4.0 - self.ofdm_demod = gr.ofdm_frame_sink2(constell.base(), + self.ofdm_demod = gr.ofdm_frame_sink(rotated_const, range(arity), self._rcvd_pktq, self._occupied_tones, phgain, frgain) @@ -254,9 +253,14 @@ class ofdm_demod(gr.hier_block2): """ Adds OFDM-specific options to the Options Parser """ - _add_common_options(normal, expert) - for mod in modulation_utils2.type_1_mods().values(): - mod.add_options(expert) + normal.add_option("-m", "--modulation", type="string", default="bpsk", + help="set modulation type (bpsk or qpsk) [default=%default]") + expert.add_option("", "--fft-length", type="intx", default=512, + help="set the number of FFT bins [default=%default]") + expert.add_option("", "--occupied-tones", type="intx", default=200, + help="set the number of occupied FFT bins [default=%default]") + expert.add_option("", "--cp-length", type="intx", default=128, + help="set the number of bits in the cyclic prefix [default=%default]") # Make a static method to call before instantiation add_options = staticmethod(add_options) |