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Obtain coarse frame boundaries with a packet detector.
Typically, the receiver perform the following tasks: 1. Obtain coarse frame boundaries with a packet detector.
Figure 5 Coarse frame synchronization using the actual T-DMB signal (IF).
Figure 6 shows the actual IF signal for the null symbol, which is extracted using the coarse frame synchronization method.
This is called coarse frame synchronization, and the process is as follows: Two sequential sample windows are set on a received T-DMB intermediate frequency (IF) signal to calculate the energy sum for corresponding signals as shown in Figure 4. Figure 4 Sample windows for the coarse frame synchronization.
Due to the signal structure of the OFDM symbol, the fine frame synchronization method can be applied after the coarse frame synchronization to find a more exact beginning point of the transmission frame.
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Usually, short quiet periods are arranged inside frames to perform a coarse intra-frame sensing as a pre-stage for fine inter-frame sensing [35].
At the encoder, the quantized symbols of original WZ frames as well as the coarse SI frames undergo Gray mapping[24] prior to SW coding.
The 'DC frames,' which are the coarse down-sampled frames with size equal to 1/8×1/8 of the original frame resolution, will be constructed as follows: In I frames, we can retrieve the DC coefficients without any problem as they are only differentially Huffman-coded.
Timing synchronization: Coarse time synchronization (Frame synchronization), and fine timing synchronization.
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.
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