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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# TRX Toolkit
# Random burst (NB, FB, SB, AB) generator
#
# (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>
#
# All Rights Reserved
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import random
from gsm_shared import *
class RandBurstGen:
# GSM 05.02 Chapter 5.2.6 Dummy Burst
db_bits = [
0, 0, 0,
1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0,
0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0,
0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0,
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0,
0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0,
0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0,
0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1,
1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1,
0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0,
0, 0, 0,
]
# Pick a random TSC for a given burst type
def get_rand_tsc(self, bt):
tsc_list = filter(lambda seq: seq.bt == bt, list(TrainingSeqGMSK))
tsc_list = list(tsc_list) # In Python 3 filter() returns an iterator
return random.choice(tsc_list)
# Generate a normal burst
def gen_nb(self, tsc = None):
buf = []
# Tailing bits
buf += [0] * 3
# Random data 1 / 2
for i in range(0, 57):
buf.append(random.randint(0, 1))
# Steal flag 1 / 2
buf.append(random.randint(0, 1))
# Training sequence
if tsc is None:
tsc = self.get_rand_tsc(BurstType.NORMAL)
buf += tsc.seq
# Steal flag 2 / 2
buf.append(random.randint(0, 1))
# Random data 2 / 2
for i in range(0, 57):
buf.append(random.randint(0, 1))
# Tailing bits
buf += [0] * 3
return buf
# Generate a frequency correction burst
def gen_fb(self):
return [0] * GSM_BURST_LEN
# Generate a synchronization burst
def gen_sb(self, tsc = None):
buf = []
# Tailing bits
buf += [0] * 3
# Random data 1 / 2
for i in range(0, 39):
buf.append(random.randint(0, 1))
# Training sequence
if tsc is None:
tsc = self.get_rand_tsc(BurstType.SYNC)
buf += tsc.seq
# Random data 2 / 2
for i in range(0, 39):
buf.append(random.randint(0, 1))
# Tailing bits
buf += [0] * 3
return buf
# Generate a dummy burst
def gen_db(self):
return self.db_bits
# Generate an access burst
def gen_ab(self, tsc = None):
buf = []
# Tailing bits
buf += [0] * 8
# Training sequence
if tsc is None:
tsc = self.get_rand_tsc(BurstType.ACCESS)
buf += tsc.seq
# Random data
for i in range(0, 36):
buf.append(random.randint(0, 1))
# Tailing bits
buf += [0] * 3
# Guard period
buf += [0] * 60
return buf
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