CAZACイコライザを用いたOFDMシステムの提案と性能評価

抄録

The authors propose the transmission system which uses the CAZAC equalizer in order to reduce the PAPR and enhance power added efficiency (PAE) of the transmitter PA. In this paper, we firstly show that the proposed CAZAC-OFDM signal have the same PAPR as single carrier signals theoretically, then we discuss about the spectrum design, the frame structure design and the synchronization issues assuming a WiFi-based wireless system in which the CAZAC equalizer is used. Finally, we show the effectiveness of the proposed CAZAC equalizer by computer simulations. It is confirmed that the proposed receiver performs well under both AWGN channels and fading channels. It is also demonstrated that the proposed CAZAC-OFDM shows much better BER than the conventional OFDM under the frequency selective fading channels. It may be caused by some kind of frequency diversity gain obtained inclusively in the CAZAC-OFDM.