Abstract: This is a mobile radio communication device having a base station and a mobile station that is connected by radio with this base station using time division multiple access, in which stable connection with the base station can be achieved and subsequently stable radio communication can be conducted.

Abstract: This is a mobile radio communication device having a base station and a mobile station that is connected by radio with this base station using time division multiple access, in which stable connection with the base station can be achieved and subsequently stable radio communication can be conducted.

Abstract: A Pi generator receives the multiplier data Y and produces the Pi on the basis of the data Y2i, Y2i+1, and Y2i+2 of three continuous bits of the multiplier data Y (in which, it is defined that Pi=Y2i+Y2i+1-2.multidot.Y2i+2, Pi=Y2i+Y2i+1-2.multidot.Y2i+2' and Y0=0, and i=0, 1, . . . , n/2-1, and Yj is the bit data of the jth bit of the multiplier Y). A partial-product generator receives the Pi from the Pi generator and a multiplicand X, and obtains the partial products X.multidot.Pi of the multiplicand X and the Pi. A partial-product adding circuit weights 2.sup.2i to the partial products X.multidot.Pi derived by the partial-product generator, and adds the resultant data, thereby producing the negative product (-X.multidot.Y) of the multiplicand X and multiplier Y.