Osmocom GSM/GPRS/EGPRS transceiver, originally forked from OpenBTS transceiver. For building SDR based GSM BTS with osmo-bts-trx.
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/*
* Copyright 2008 Free Software Foundation, Inc.
* Copyright 2011 Range Networks, Inc.
*
* SPDX-License-Identifier: AGPL-3.0+
*
* This software is distributed under the terms of the GNU Affero Public License.
* See the COPYING file in the main directory for details.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "GSMCommon.h"
using namespace GSM;
using namespace std;
const BitVector GSM::gTrainingSequence[] = {
BitVector("00100101110000100010010111"),
BitVector("00101101110111100010110111"),
BitVector("01000011101110100100001110"),
BitVector("01000111101101000100011110"),
BitVector("00011010111001000001101011"),
BitVector("01001110101100000100111010"),
BitVector("10100111110110001010011111"),
BitVector("11101111000100101110111100"),
};
const BitVector GSM::gEdgeTrainingSequence[] = {
BitVector("111111001111111001111001001001111111111111001111111111001111111001111001001001"),
BitVector("111111001111001001111001001001111001001001001111111111001111001001111001001001"),
BitVector("111001111111111111001001001111001001001111001111111001111111111111001001001111"),
BitVector("111001111111111001001001001111001001111001111111111001111111111001001001001111"),
BitVector("111111111001001111001111001001001111111001111111111111111001001111001111001001"),
BitVector("111001111111001001001111001111001001111111111111111001111111001001001111001111"),
BitVector("001111001111111001001001001001111001001111111111001111001111111001001001001001"),
BitVector("001001001111001001001001111111111001111111001111001001001111001001001001111111"),
};
const BitVector GSM::gDummyBurst("0001111101101110110000010100100111000001001000100000001111100011100010111000101110001010111010010100011001100111001111010011111000100101111101010000");
/* 3GPP TS 05.02, section 5.2.7 "Access burst (AB)", synch. sequence bits */
const BitVector GSM::gRACHSynchSequenceTS0("01001011011111111001100110101010001111000"); /* GSM, GMSK (default) */
const BitVector GSM::gRACHSynchSequenceTS1("01010100111110001000011000101111001001101"); /* EGPRS, 8-PSK */
const BitVector GSM::gRACHSynchSequenceTS2("11101111001001110101011000001101101110111"); /* EGPRS, GMSK */
// |-head-||---------midamble----------------------||--------------data----------------||t|
const BitVector GSM::gRACHBurst("0011101001001011011111111001100110101010001111000110111101111110000111001001010110011000");
int32_t GSM::FNDelta(int32_t v1, int32_t v2)
{
static const int32_t halfModulus = gHyperframe/2;
int32_t delta = v1-v2;
if (delta>=halfModulus) delta -= gHyperframe;
else if (delta<-halfModulus) delta += gHyperframe;
return (int32_t) delta;
}
int GSM::FNCompare(int32_t v1, int32_t v2)
{
int32_t delta = FNDelta(v1,v2);
if (delta>0) return 1;
if (delta<0) return -1;
return 0;
}
ostream& GSM::operator<<(ostream& os, const Time& t)
{
os << t.TN() << ":" << t.FN();
return os;
}
// vim: ts=4 sw=4