Study for Various Array Antenna assisted Doppler Spread Compensator with MRC Diversity of ISDB-T Receiver

Digital television terrestrial broadcasting (DTTB) based on OFDM (orthogonal frequency division multiplexing) is sensitive to Doppler spread and multi-path propagation in mobile environment. A part of authors has already proposed a Doppler spread compensator based on linear array antenna. However, the proposed linear array antenna assisted Doppler spread compensator did not take into account an effect of electromagnetic coupling amongst elements. Also, it did not have diversity function while it has a several elements. This paper proposes two types of array antenna assisted Doppler spread compensators, which employ dipole array and monopole array, and which work as a maximum ratio combining (MRC) diversity as well as the Doppler spread compensator. Computer simulation results confirm that the dipole-array receiver outperforms the monopole-array receiver