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For a practical ADT system, a synchronization frame is inserted between consecutive message frames.
Timing synchronization: Coarse time synchronization (Frame synchronization), and fine timing synchronization.
The algorithm is divided into three consecutive steps: slot synchronization, frame synchronization and scrambling code identification.
By introducing an event generator in the control loop, the model of event-triggered master slave synchronization frame is constructed.
In general, the synchronization process in DVB-T2 is achieved in two categories: (i) Timing synchronization: Coarse time synchronization (Frame synchronization), and fine timing synchronization.
In our case, the synchronization frame contains the frame identifier (8 bit), the synchronization state (8 bit), the nominal phase offset (16 bit), the phase adjustment value (16 bit), the sender timestamp (32 bit), the tick-number (16 bit), and a checksum (8 bit).
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In the current work, interpolation is performed along the time axis only because message frames reside between synchronization frames.
In order to obtain the channel measurements at the synchronization frames, the MCLT coefficients are multiplied by the known synchronization sequence.
Table 1 Parameters of the system configurations tested Parameters Values Sampling frequency 44.1 kHz MCLT length (M) 512, 1,024,…, 8,192 Message frames between synchronization frames 2 frames Data frequency 6.5 to 9.2 kHz Bit repetition (L) 4 Bit rate 231 bps.
Local synchronization and the crucial task of determining the proper timing for transmission and reception of data is achieved through the periodic broadcast of special synchronization frames at the beginning of each on-period.
We used an inverse system decoupling control method in the permanent magnet synchronous motor decoupling control, and analysis the mathematics model of the permanent magnet synchronous motor in d-q synchronization reference frame, and put forward the inverse system analytical expressions of the motor.
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