laforge has submitted this change and it was merged. ( https://gerrit.osmocom.org/c/osmocom-bb/+/14690 )
Change subject: trx_toolkit/gsm_shared.py: introduce a new enum TrainingSeqGMSK ...................................................................... trx_toolkit/gsm_shared.py: introduce a new enum TrainingSeqGMSK Training Sequences are defined in 3GPP TS 45.002, and used by the transceiver for detecting bursts. This change introduces an enum with training sequences for GMSK for Access and Normal bursts. This enumeration is needed for the follow-up changes that implement TRXD header version 1 support, and can now be used by RandBurstGen. Change-Id: If3bf102019ef53d6ee9ad230ef98bb45845b5af5 --- M src/target/trx_toolkit/gsm_shared.py 1 file changed, 78 insertions(+), 1 deletion(-) Approvals: laforge: Looks good to me, but someone else must approve osmith: Looks good to me, approved Jenkins Builder: Verified diff --git a/src/target/trx_toolkit/gsm_shared.py b/src/target/trx_toolkit/gsm_shared.py index d2f8278..d76978e 100644 --- a/src/target/trx_toolkit/gsm_shared.py +++ b/src/target/trx_toolkit/gsm_shared.py @@ -4,7 +4,7 @@ # TRX Toolkit # Common GSM constants # -# (C) 2018 by Vadim Yanitskiy <[email protected]> +# (C) 2018-2019 by Vadim Yanitskiy <[email protected]> # # All Rights Reserved # @@ -22,6 +22,8 @@ # with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +from enum import Enum + # TDMA definitions GSM_SUPERFRAME = 26 * 51 GSM_HYPERFRAME = 2048 * GSM_SUPERFRAME @@ -29,3 +31,78 @@ # Burst length GSM_BURST_LEN = 148 EDGE_BURST_LEN = GSM_BURST_LEN * 3 + +class BurstType(Enum): + """ Burst types defined in 3GPP TS 45.002 """ + DUMMY = ("DB") # Dummy burst (5.2.6) + SYNC = ("SB") # Synchronization Burst (5.2.5) + FREQ = ("FB") # Frequency correction Burst (5.2.4) + ACCESS = ("AB") # Access Burst (5.2.7) + NORMAL = ("NB") # Normal Burst (5.2.3) + # HSR = ("HB") # Higher symbol rate burst (5.2.3a) + +class TrainingSeqGMSK(Enum): + """ Training Sequences defined in 3GPP TS 45.002 """ + + # Training Sequences for Access Burst (table 5.2.7-3) + AB_TS0 = (0, BurstType.ACCESS, "01001011011111111001100110101010001111000") + AB_TS1 = (1, BurstType.ACCESS, "01010100111110001000011000101111001001101") + AB_TS2 = (2, BurstType.ACCESS, "11101111001001110101011000001101101110111") + AB_TS4 = (4, BurstType.ACCESS, "11001001110001001110000000001101010110010") + + # Training Sequences for Access Burst (table 5.2.7-4) + AB_TS3 = (3, BurstType.ACCESS, "10001000111010111011010000010000101100010") + AB_TS5 = (5, BurstType.ACCESS, "01010000111111110101110101101100110010100") + AB_TS6 = (6, BurstType.ACCESS, "01011110011101011110110100010011000010111") + AB_TS7 = (7, BurstType.ACCESS, "01000010110000011101001010111011100010000") + + # Training Sequences for Synchronization Burst (table 5.2.5-3) + SB_TS0 = (0, BurstType.SYNC, "1011100101100010000001000000111100101101010001010111011000011011") + SB_TS1 = (1, BurstType.SYNC, "1110111001101011001010000011111011110100011111101100101100010101") + SB_TS2 = (2, BurstType.SYNC, "1110110000110111010100010101101001111000000100000010001101001110") + SB_TS3 = (3, BurstType.SYNC, "1011101000111101110101101111010010001011010000001000111010011000") + + # Training Sequences for Normal Burst (table 5.2.3a, TSC set 1) + NB_TS0 = (0, BurstType.NORMAL, "00100101110000100010010111") + NB_TS1 = (1, BurstType.NORMAL, "00101101110111100010110111") + NB_TS2 = (2, BurstType.NORMAL, "01000011101110100100001110") + NB_TS3 = (3, BurstType.NORMAL, "01000111101101000100011110") + NB_TS4 = (4, BurstType.NORMAL, "00011010111001000001101011") + NB_TS5 = (5, BurstType.NORMAL, "01001110101100000100111010") + NB_TS6 = (6, BurstType.NORMAL, "10100111110110001010011111") + NB_TS7 = (7, BurstType.NORMAL, "11101111000100101110111100") + + # TODO: more TSC sets from tables 5.2.3b-d + + def __init__(self, tsc, bt, seq_str, tsc_set = 0): + # Training Sequence Code + self.tsc = tsc + # Burst type + self.bt = bt + + # Training Sequence Code set + # NOTE: unlike the specs. we count from zero + self.tsc_set = tsc_set + + # Generate Training Sequence bits + self.seq = [int(x) for x in seq_str] + + @classmethod + def pick(self, burst): + # Normal burst TS (26 bits) + nb_seq = burst[3 + 57 + 1:][:26] + # Access burst TS (41 bits) + ab_seq = burst[8:][:41] + # Sync Burst TS (64 bits) + sb_seq = burst[3 + 39:][:64] + + for ts in list(self): + # Ugly Python way of writing 'switch' statement + if ts.bt is BurstType.NORMAL and ts.seq == nb_seq: + return ts + elif ts.bt is BurstType.ACCESS and ts.seq == ab_seq: + return ts + elif ts.bt is BurstType.SYNC and ts.seq == sb_seq: + return ts + + return None -- To view, visit https://gerrit.osmocom.org/c/osmocom-bb/+/14690 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmocom-bb Gerrit-Branch: master Gerrit-Change-Id: If3bf102019ef53d6ee9ad230ef98bb45845b5af5 Gerrit-Change-Number: 14690 Gerrit-PatchSet: 2 Gerrit-Owner: fixeria <[email protected]> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: laforge <[email protected]> Gerrit-Reviewer: osmith <[email protected]> Gerrit-MessageType: merged
