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Frame Synchronizer for turbo Code Based on Two Kinds of Information’s Fusion


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Frame Synchronizer for turbo Code Based on Two Kinds of Information’s Fusion
LI Mao-peiZHOU Ting-xian
Communication Research Center,Harbin Institute of Technology,Harbin 150001,China
turbo code frame synchronizer attached synchronization maker maximum a posteriori maximum
information fusion
A new frame synchronizer for turbo code based on the fusion of two kinds of information is proposed in this paper. It is found that the statist ic characteristics of the mean of the extrinsic informat ion. s absolute values after the first iterative step in the case of perfect frame synchronization are distinctly different from those that are obtained when the synchronization loses. In the environment of low signal to noise ratio, the traditional synchronizat ion schemes based on the correlation method can not match the strong error correcting ability of turbo code. In order to lower the frame synchronization error rate ( FSER) while not introducing so much calculated load, the maximum a posteriori (MAP) information from turbo decoder after the first iterative decoding step and the max-i mum likelihood ( ML) information from the ASM correlation are fused into one belief metric. Simulation results show that the novel algorithm can get much lower FSER at the price of a little more additional calculation.


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Last Update: 2013-03-03