| 摘要 |
PROBLEM TO BE SOLVED: To essentially enlarge the dynamic range of a synthesis coefficient and to prevent the error of size decision at the time of decoding by uniformly raising a level, in the case that the respective synthesis coefficients for indicating weighting for respective reception systems used for synthesizing the respective pieces of reception information obtained in the plural reception systems are all equal to or less than a threshold value. SOLUTION: The synthesis coefficients Ck (k)=1, 2, 3, 4} used for the weighting for the respective reception systems in synthesis diversity are data for indicating a reception level. When the synthesis coefficients Ck are inputted, a conversion part 314 compares them with the threshold level, 0.25 for instance, and in the case that they are all smaller than the threshold, the synthesis coefficients Tk (k)=1,2,3,4} for which the respective synthesis coefficients Ck are shifted (quadrupled) by two bits to a higher order digit are outputted. Phase modulation parts 329-332 output phase data θk (k)=1,2,3,4}. In component ROMs 317-320 and Q component ROMs 321-324 output Tk<2> cosθk and the Tk<2> sinθk. Since the level of the value of Tk has been raised, decision in a decision part 327 is accurately performed. |
