LOOP BACK DELAY CCORRECTION DEVICE AND LOOP BACK DELAY CCORRECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a loop back delay ccorrection device capable of correcting the phase delay of a loop back signal by eliminating deviation between a sampled IF frequency and a discrete frequency point, thereby improving the ccorrection precision of distortion caused in the modulation of a transmitting signal. SOLUTION: The loop back delay ccorrection device is constituted so that a phase shift to an output signal of a modulator is corrected by computingΔkIF, KIFintby which a frequency point obtained by sampling the IF frequency of the loop back signal becomes an integer by a CPU 21 of host control, preliminarily registering the frequency point in a parameter generation part 15, generating a frequency shift signal using theΔkIF, KIFintgenerated by the parameter generation part 15 in a frequency shift signal operation part 14 in an operation and multiplying the frequency shift signal to the loop back signal by multiplication parts 12, 13. COPYRIGHT: (C)2008,JPO&INPIT