Frame synchronization device and method for T-DMB system receiver
A T-DMB and receiver technology, applied in the field of T-DMB system receiver frame synchronization, can solve problems such as large amount of calculation, difficult threshold value, and large storage resources, so as to overcome the interference of time domain pulses and reduce the Hardware implementation overhead, the effect of reducing storage resources
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[0023] For the null symbol of the synchronous channel, although the signal at the sending end is 0, there is still relatively large noise after passing through the channel interference; therefore, the simple threshold value setting often fails in the detection, in order to detect the null symbol , the present invention introduces a symbol counter. The basic idea is to find the difference between the signal amplitude M and the fixed threshold T, and count the sign bit S of the difference. In non-null symbols, S should be mostly 1, and in null symbols, S is -1, so the count value of this symbol counter will have a change trend similar to that of a zigzag (its shape can be referred to figure 2 ), as long as the two turning points of the count value change are determined, the starting point and the ending point of the null symbol are found, thereby determining the position of the frame header.
[0024] The synchronization process that the present invention specifically realizes ...
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