def __init__(self, samples_per_symbol, bits_per_symbol, access_code='', pad_for_usrp=True):
"""
packet_mod constructor.
Args:
samples_per_symbol: number of samples per symbol
bits_per_symbol: number of bits per symbol
access_code: AKA sync vector
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
payload_length: number of bytes in a data-stream slice
"""
#setup parameters
self._samples_per_symbol = samples_per_symbol
self._bits_per_symbol = bits_per_symbol
self._pad_for_usrp = pad_for_usrp
if not access_code: #get access code
access_code = packet_utils.default_access_code
if not packet_utils.is_1_0_string(access_code):
raise ValueError, "Invalid access_code %r. Must be string of 1's and 0's" % (access_code,)
self._access_code = access_code
self._pad_for_usrp = pad_for_usrp
#create blocks
msg_source = blocks.message_source(gr.sizeof_char, DEFAULT_MSGQ_LIMIT)
self._msgq_out = msg_source.msgq()
#initialize hier2
gr.hier_block2.__init__(
self,
"packet_encoder",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(1, 1, gr.sizeof_char) # Output signature
)
#connect
self.connect(msg_source, self)
def __init__(self, packet_sink=None):
#initialize hier2
gr.hier_block2.__init__(
self,
"ofdm_mod",
gr.io_signature(1, 1, packet_sink._hb.input_signature().sizeof_stream_item(0)), # Input signature
gr.io_signature(1, 1, self._item_size_out) # Output signature
)
#create blocks
msg_source = blocks.message_source(self._item_size_out, DEFAULT_MSGQ_LIMIT)
self._msgq_out = msg_source.msgq()
#connect
self.connect(self, packet_sink)
self.connect(msg_source, self)
if packet_sink._hb.output_signature().sizeof_stream_item(0):
self.connect(packet_sink,
blocks.null_sink(packet_sink._hb.output_signature().sizeof_stream_item(0)))
def __init__(self, type='BER', win_size=default_win_size, bits_per_symbol=2):
"""
Error rate constructor.
Args:
type: a string 'BER' or 'SER'
win_size: the number of samples to calculate over
bits_per_symbol: the number of information bits per symbol (BER only)
"""
#init
gr.hier_block2.__init__(
self, 'error_rate',
gr.io_signature(2, 2, gr.sizeof_char),
gr.io_signature(1, 1, gr.sizeof_float),
)
assert type in ('BER', 'SER')
self._max_samples = win_size
self._bits_per_symbol = bits_per_symbol
#setup message queue
msg_source = blocks.message_source(gr.sizeof_float, 1)
self._msgq_source = msg_source.msgq()
msgq_sink = gr.msg_queue(2)
msg_sink = blocks.message_sink(gr.sizeof_char, msgq_sink, False) #False -> blocking
inter = blocks.interleave(gr.sizeof_char)
#start thread
self._num_errs = 0
self._err_index = 0
self._num_samps = 0
self._err_array = numpy.zeros(self._max_samples, numpy.int8)
if type == 'BER':
input_watcher(msgq_sink, self._handler_ber)
elif type == 'SER':
input_watcher(msgq_sink, self._handler_ser)
#connect
self.connect(msg_source, self)
self.connect((self, 0), (inter, 0))
self.connect((self, 1), (inter, 1))
self.connect(inter, msg_sink)
