Python Receiver.process方法代码示例

# 需要导入模块: from receiver import Receiver [as 别名]
# 或者: from receiver.Receiver import process [as 别名]
def run(config):
    '''Primary Audiocom functionality.'''

    # Create the preamble to pre-pend to the transmission
    preamble = Preamble(config)

    # Create the sources
    sources = {}
    for i in range(len(config.channels)):
        frequency = config.channels[i]
        source = Source(config, i)
        print "Channel: %d Hz" % frequency
        print "\n".join(["\t%s" % source])
        sources[frequency] = source

    # Create a sender for each source, so we can process the bits to
    # get the modulated samples.  We combine all of the modulated
    # samples into a single array by adding them.
    modulated_samples = []
    for frequency in sources:
        src = sources[frequency]
        sender = Sender(frequency, preamble, config)
        sender.set_source(src)
        modulated_samples = util.add_arrays(sender.modulated_samples(), modulated_samples)

    # Create the channel
    if config.bypass:
        channel = AbstractChannel(config.bypass_noise, config.bypass_h, config.bypass_lag)
    else:
        channel = AudioChannel(config)

    # Transmit and receive data on the channel.  The received samples
    # (samples_rx) have not been processed in any way.
    samples_rx = channel.xmit_and_recv(modulated_samples)
    print 'Received', len(samples_rx), 'samples'

    for frequency in config.channels:
        r = Receiver(frequency, preamble, config)
        try:
            # Call the main receiver function.  The returned array of bits
            # EXCLUDES the preamble.
            bits  = r.process(samples_rx)

            # Push into a Sink so we can convert back to a useful payload
            # (this step will become more useful when we're transmitting
            # files or images instead of just bit arrays)
            src = sources[frequency]
            sink = Sink(src)
            received_payload = sink.process(bits)
            print "Received %d data bits" % len(received_payload)
            if src.type == Source.TEXT:
                print "Received text was:", sink.received_text
 
            if len(received_payload) > 0:
                # Output BER
                hd = util.hamming(received_payload, src.payload)
                ber = float(hd)/len(received_payload)
                print 'BER:', ber
            else:
                print 'Could not recover transmission.'

        except Exception as e:
            # In general, this is a fatal exception.  But we'd still like
            # to look at the graphs, so we'll continue with that output
            print '*** ERROR: Could not detect preamble. ***'
            print repr(e)

        # Plot graphs if necessary
        if config.graphs:
            try:
                len_demod = config.spb * (len(received_payload) + preamble.preamble_data_len())
            except:
                # If we didn't receive the payload, make a reasonable guess for the number of bits
                # (won't work for filetype, where n_bits changes)
                len_demod = config.spb * (config.n_bits + preamble.preamble_data_len())

            if config.demod_type == Receiver.QUADRATURE:
                filtered = r.graph_info.demod_samples
                graphs.plot_sig_spectrum(samples_rx, filtered, "received samples", "filtered samples")
            elif config.src_type == Source.U:
                demod_samples = r.graph_info.demod_samples
                plotrange = preamble.preamble_data_len()*config.spb
                graphs.plot_samples(demod_samples[plotrange:len_demod], 'unit-step response', show=True)
            else:
                graphs.plot_graphs(r.graph_info.demod_samples[:len_demod], r.graph_info.hist_samples[:len_demod], config.spb, preamble)

# 需要导入模块: from receiver import Receiver [as 别名]
# 或者: from receiver.Receiver import process [as 别名]
def run(config):
    '''Primary Audiocom functionality.'''

    # Create the preamble to pre-pend to the transmission
    preamble = Preamble(config)

    # Create a source
    source = Source(config)
    frequency = config.channel
    print "Channel: %d Hz" % frequency
    print "\n".join(["\t%s" % source])

    # Create the Sender for this Source.  Process the bits to get
    # modulated samples.
    sender = Sender(frequency, preamble, config)
    sender.set_source(source)
    modulated_samples = sender.modulated_samples()

    # Create the channel
    if config.bypass:
        channel = AbstractChannel(config.bypass_noise, config.bypass_h)
    else:
        channel = AudioChannel(config)

    # Transmit and receive data on the channel.  The received samples
    # (samples_rx) have not been processed in any way.
    samples_rx = channel.xmit_and_recv(modulated_samples)
    print 'Received', len(samples_rx), 'samples'

    r = Receiver(frequency, preamble, config)
    try:
        # Call the main receiver function.  The returned array of bits
        # EXCLUDES the preamble.
        bits  = r.process(samples_rx)

        # Push into a Sink so we can convert back to a useful payload
        # (this step will become more useful when we're transmitting
        # files or images instead of just bit arrays)
        sink = Sink(source)
        received_payload = sink.process(bits)
        print "Received %d data bits" % len(received_payload)
 
        if len(received_payload) > 0:
            # Output BER
            hd = util.hamming(received_payload, source.payload)
            ber = float(hd)/len(received_payload)
            print 'BER:', ber
        else:
            print 'Could not recover transmission.'

    except Exception as e:
        # In general, this is a fatal exception.  But we'd still like
        # to look at the graphs, so we'll continue with that output
        print '*** ERROR: Could not detect preamble. ***'

    # Plot graphs if necessary
    if config.graphs:

        try:
            len_demod = config.spb * (len(received_payload) + preamble.preamble_data_len())
        except:
            # If we didn't receive the payload, make a reasonable guess for the number of bits
            len_demod = config.spb * (config.n_bits + preamble.preamble_data_len())

        if config.src_type == Source.U:
            demod_samples = r.graph_info.demod_samples
            plotrange = preamble.preamble_data_len()*config.spb
            graphs.plot_samples(demod_samples[plotrange:len_demod], 'unit-step response', show=True)

        else:
            graphs.plot_graphs(r.graph_info.demod_samples[:len_demod], r.graph_info.hist_samples[:len_demod], config.spb, preamble)