Frame sync generating method in ground digital multimedia TV broad cast system
A TV broadcasting, terrestrial digital technology, applied in the field of digital information transmission
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[0061] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0062] The baseband frame synchronization signal consists of a preamble, a PN sequence and a postamble. The preamble can be defined as 0, 24, and 25 symbols, the postamble can be defined as 1, 25, and 104 symbols, and the PN sequence has 255 symbols. For different signal frames in a signal frame group, there are different frame synchronization signals. Therefore, the frame sync can be used for identification as a frame sync feature of a particular signal frame. Preamble and postamble are defined as cyclic extensions of the PN sequence.
[0063] The PN sequence is defined as an 8-order m-sequence implemented by a Fibonacci-type linear feedback shift register (LFSR). Its characteristic polynomial is defined as x 8 +x 6 +x 5 +x+1. A block diagram of the LFSR is shown in Figure 2. The initial condition module determines the phase of the ge...
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