zwischenverstu00e4rker of ofdm u00fcbertragungssignals and receiver

摘要

The RF input signal to be relayed is converted in frequency by a down-converter (1) from RF band to IF band, and is converted into digital signal by an AD converter (2), and is further transformed into a complex baseband OFDM signal by a quadrature demodulation circuit (3). A compensation amount detector (4) feeds the signal from the quadrature demodulation circuit (3) into a delay unit (41), and delays according to the instruction from a delay controller (42), and a correlation detector (43) detects the correlation before and after the delay, and it is integrated in an integrator (44), and put into a compensation amount operator (45). This compensation amount operator (45) determines the delay time control signal from the output of the delay controller (42), and operates the compensation signal showing the amplitude and phase compensation component as its reverse characteristic from the output of the integrator (44). The delay time control signal and compensation signal obtained herein are sent into a compensator (5), in which the undesired wave components due to circulating of relay output or multipath are eliminated. IMAGE