| 摘要 |
PROBLEM TO BE SOLVED: To reduce a circuit scale without affecting an influence to frequency characteristics of a transmission FIR filter of a base band section of a communication system. SOLUTION: A processing order of transmitting power ratio regulating, channel combining, and FIR filtering of the base band section are replaced, a channel output of a 1-bit width before a power value is multiplied is FIR filtered, and then power ratio regulating and channel combining are executed. Adders in the FIR filter are then divided into two. A power coefficient before switching is multiplied by one output, and a power coefficient after switching is multiplied by another output. An enable signal of a signal input to the adder is controlled so as to gradually switch the power coefficients. Thus, even when the power coefficient is changed during transmission, filter output characteristics are maintained constantly. |
