Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 1925

b) synchronization and ambiguity resolution. 6.4.4.1.1.1 Transmitter ramp-up and power stabilization. This shall be as defined in Section 6.4.3.1.1.1. 6.4.4.1.1.2 Synchronization and ambiguity resolution. The second component of the training sequence shall consist of the synchronization sequence, known as S2*, as follows: 000 001 101 100 110 010 111 100 010 011 101 000 111 000 011 001 and shall be transmitted from left to right. Note.— The sequence S2* is very closely related to the sequence S2 (Section 6.4.4.3.1.2) . The 15 phase changes between the 16 symbols of S2* are each exactly 180o out of phase from the 15 phase changes associated with S2 . This relationship can be used to simplify the process of simultaneously searching for both sequences. 6.4.4.1.2 System data and handoff check message. The non-3T configuration (as contained in the Manual on VDL Mode 3 Technical Specifications) system data shall consist of 32 transmitted symbols. The 96 transmitted bits shall include 48 bits of information and 48 parity bits, generated as 4 Golay (24, 12) code words. The 3T configuration as contained in the Manual on VDL Mode 3 Technical Specifications shall consist of 128 transmitted symbols. The 384 transmitted bits shall include 192 bits of information and 192 parity bits, generated as 16 Golay (24, 12) code words. The 3T configuration handoff check message shall consist of 40 transmitted symbols. The 120 transmitted bits shall include 60 bits of information and 60 parity bits, generated as 5 Golay (24,12) code words. The specific definition of the Golay encoder shall be as follows: If the 12 bit input bit sequence is written as a row vector x, then the 24 bit output sequence can be written as the row vector y, where y = x G, and the matrix G shall be given by Annex 10 — Aeronautical Communications Volume III 22/11/07 I-6-14 1 1 0 1 0 1 1 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1 0 0 1 0 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 1 1 1 0 1 1 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 1 1 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 G = 1 0 1 1 0 0 1 1 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 1 1 0 0 1 1 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 1 1 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 1 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 Note.— The extended Golay code allows for the correction of any error pattern with 3 or fewer bit errors and the detection of any 4-bit error pattern. 6.4.4.1.3 Transmitter ramp-down. The transmitter power shall be –20 dBc within 2.5 symbol periods of the middle of the final symbol of the burst. The transmitter power leakage when the transmitter is in the “off” state shall be less than -83 dBm. Note.— Reference RTCA/DO-160D section 21, category H for antenna radiated signals. 6.4.4.2 Management (M) burst downlink. The M downlink burst (as contained in the Manual on VDL Mode 3 Technical Specifications) shall consist of three segments, the training sequence followed by the system data and the transmitter ramp down. 6.4.4.2.1 Training sequence. The M downlink burst training sequence shall consist of two components as follows:

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