| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a linearizer to reduce signal spectrum regrowth due to bandwidth limitation in a feedback path. <P>SOLUTION: An ISI replica unit is provided which introduces interference components similar to one due to LPF into an output of HPA model unit. An HPA model unit models a characteristic of HPA using an output signal of a predistorter and an error signal obtained by subtracting a feedback signal from an output of the ISI replica unit such that the error signal approaches zero. The feedback signal is used after filtration by LPF, thereby including interference components. The error signal obtained by the feedback signal after LPF and the output signal of the ISI replica unit includes few interference components, and thereby modeling by the HPA model unit becomes accurate and the linearization performance becomes better. <P>COPYRIGHT: (C)2013,JPO&INPIT |
