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occupied channel slzould occur within 0.5 milliseconds.
On reception, the de-interleaver shall calculate the number of
rows and size of the last (potentially partial) row from the Note.- A higher probability of false alarm is acceptable on
length field in the header. It shall only pass valid data bytes to the idle to busy detection than the busy to idle detection
the higher layer. becuuse of the effects of the two different errors.
1/11/01
No. 76
Part I Annex 10 - Aeronautical Telecommunicatwns
6.4.3.3 MODE 2 RECEIVER/TRANSMI~
INTERACTION
6.4.3.3.1 Receiver to transmitter turnaround tbne. A
station shall transmit the training sequence such that the centre
of the first symbol of the unique word will be transmitted
within 1.25 milliseconds after the result of an access attempt
is successful (see Figure 6-3). The total frequency change
during the transmission of thc unique word shall be less than
10 Hz. After transmission of the unique word, .the phase
acceleration shall be less than 500 Hz per second.
6.4.3.3.2 Transmitter co receiver turnaround time. The
transmitter power shall bc -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. A station shall be capable of receiving
and demodulating with nominal performance, an incoming
signal within 1.5 milliseconds after transmission of the final
information symbol.
Note.- Reference DO-16OD section 21, category H for
antenna radiated signals.
6.4.3.4 MODE2 PHYSICALLA YER SYSTEM
PARAMETERS
6.4.3.4.1 The physical layer shall implement the system
parameters as defined in Table 6-4.
6.4.3.4.1.1 Paranaeter PI (minimum fransmission length).
Parameter Pl defines the minimum transmission length that a
receiver shall be capable of demodulating without degradation
of BER.
a) txansrnitccr ramp up and power stabilization; and
b) syrrchronization 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 urnbiguity resol~ltion.T he
second component of the training sequence shall consist of the
synchronization sequence, known as Sz*, as follows:
and shall be transmitted from left to right.
Note.- The sequence S2* is veq closely rellclted to the
seqlience S, (Section 6.4.4.3.1.2) . The 15 phase changes
between the 16 symbols of S,* are each exactjy 11800 out of
phase from the 15 phase changes associuted with S, . This
relarionship can be used to simplib the process of
simultaneously searching for both sequences.
6.4.4.1.2 System dara 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
(a1,2) code words. The 3T configuration as contained in the
Manual on VDL Mode 3 Technical Specifications shall consist
of 128 transmitted symbols. The 384 ttmsmitted bits shall
include 192 bits of information and 192 parity bitits, 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:
6.4.4 Mode 3 specific physical layer
If the 12 bit input bit sequence is written as a row vector x,
Note.- The Mode 3 specific physical layer specification then the 24 bit output sequence can be written as the row
includes a description of Mode 3 management (M) burst and vector y, where y = x G, and the matrix G shall be given by
handoff check message (H) burst uplink. M burst downlink,
voice/datu (V/D) burst, and bit scmmbling.
6.4.4.1 Management (M) burst and handoff check
message (H) burst uplink. The M uplink 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. The H uplink
burst (as contained in the Manual on VDL Mode 3 Technical
Specifications) shall consisl of three segments, the training
sequence followed by the handoff check message and the
transmitter ramp down.
6.4.4.1.1 Training sequence. Uplink M burst and H burst
training sequences shall consist of two components as follows:
Note.- The extended Golay code allows for the correction
　
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