+from gnuradio import eng_notation
+
+def pick_rx_bitrate(bitrate, bits_per_symbol,
+ converter_rate, possible_decims):
+ """
+ Given the 4 input parameters, return at configuration that matches
+
+ @param bitrate: desired bitrate or None
+ @type bitrate: number or None
+ @param bits_per_symbol: E.g., BPSK -> 1, QPSK -> 2, 8-PSK -> 3
+ @type bits_per_symbol: integer >= 1
+ @param converter_rate: converter sample rate in Hz
+ @type converter_rate: number
+ @param possible_decims: a list of possible rates
+ @type possible_decims: a list of integers
+
+ @returns tuple (bitrate, samples_per_symbol, decim_rate)
+ """
+
+ rates = list(possible_decims)
+ rates.sort()
+
+ for i in xrange(len(rates)):
+ if((converter_rate / float(bits_per_symbol) / rates[i]) >= 2*bitrate):
+ decim = rates[i]
+ else:
+ break
+
+ sps = converter_rate / float(bits_per_symbol) / decim / bitrate
+ br = converter_rate / float(bits_per_symbol) / decim / sps
+
+ return (br, sps, int(decim))
+
+
+def pick_tx_bitrate(bitrate, bits_per_symbol,
+ converter_rate, possible_interps):
+ """
+ Given the 4 input parameters, return at configuration that matches
+
+ @param bitrate: desired bitrate or None
+ @type bitrate: number or None
+ @param bits_per_symbol: E.g., BPSK -> 1, QPSK -> 2, 8-PSK -> 3
+ @type bits_per_symbol: integer >= 1
+ @param converter_rate: converter sample rate in Hz
+ @type converter_rate: number
+ @param possible_interps: a list of possible rates
+ @type possible_interps: a list of integers
+
+ @returns tuple (bitrate, samples_per_symbol, interp_rate)
+ """
+
+ rates = list(possible_interps)
+ rates.sort()
+
+ for i in xrange(len(rates)):
+ if((converter_rate / float(bits_per_symbol) / rates[i]) >= 2*bitrate):
+ interp = rates[i]
+ else:
+ break
+
+ sps = converter_rate / float(bits_per_symbol) / interp / bitrate
+ br = converter_rate / float(bits_per_symbol) / interp / sps
+
+ return (br, sps, int(interp))