Abstract
A novel frame synchronization technique for a turbo decoder is presented based on the concept of a probability surface metric within a modified maximum a posteriori decoder. Using a counter with a reflecting barrier to establish whether there is sufficient evidence to reject the existing synchronization state, theoretical expressions are derived for the performance of this technique for any channel signal-to-noise ratio. The probability of a false-alarm can be reduced to an extremely small value with a penalty of only a slight increase in the average number of information bits to be processed to reject an incorrect synchronization state. Simulation results are presented for the standard rate 1/2 (7,5) turbo code.
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