A Study on Multipath Channel Modeling for Mobile Reception with an OFDM and Equalization Method for Reducing Interference by Using Estimated Propagation Path Characteristics

Abstract

In Japan, the Digital Terrestrial Television Broadcasting (DTTB) system is expected to have mobile reception capability. It is well known that the effect of multipath interference in the fixed condition can be reduced by using the Orthogonal Frequency Division Multiplex (OFDM) method. However, the signal quality degrades seriously due to frequency selective fading and Doppler shifts of the mobile environment. This is because the orthogonality between the carriers has been lost due to this interference. In this paper, we discuss about multipath channel modeling for mobile reception with an OFDM. And we propose a symbol equalization method for coherent demodulation. We also show that the BER characteristics have been improved, and that mobile reception using the 16QAM OFDM system is possible.