ARITHMETIC PROCESSING UNIT FOR USING MAXIMUM LIKELIHOOD SEQUENCE ESTIMATE METHOD

摘要

PROBLEM TO BE SOLVED: To provide an arithmetic processing unit that applies equalization processing of a maximum likelihood sequence estimate type at a low operating speed to multi-value modulated reception data. SOLUTION: Branch metric generating sections 16 and placed in parallel by 2 to the power of number of bits in one symbol of a received signal and reduce an object symbol of the received signal from a channel estimate value every time an output of a counter 1 is incremented to generate a branch metric. ACS(Add, Compare, Select) arithmetic sections 31 are placed in parallel by 2 to the power of number of bits in one symbol of the received signal to conduct the ACS arithmetic operation on the basis of the path metric read from a storage section 20 and a plurality of branch metrics generated by the branch metric generating sections 16 to calculate a maximum likelihood state and to update a maximum likelihood path metric.