Dipole Array Antenna Assisted Doppler Spread Compensator with MRC Diversity for ISDB-T Receiver

Young-Cheol YU  Minoru OKADA  Heiichi YAMAMOTO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.5   pp.1214-1221
Publication Date: 2007/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.5.1214
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Broadcast Systems
Keyword: 
DTTB,  array-antenna,  Doppler spread,  diversity,  

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Summary: 
We propose a dipole array antenna assisted Doppler spread compensator with maximum ratio combining (MRC) diversity for mobile reception by a digital television terrestrial broadcasting receiver. Although OFDM (Orthogonal Frequency Division Multiplexing), used for the physical layer standard of digital terrestrial television broadcasting (DTTB), is robust to multi-path delay spreading thanks to its long symbol interval, it is sensitive to Doppler spread. OFDM itself cannot mitigate the performance degradation due to fading unless error correction coding is also used. Furthermore, although a Doppler spread compensator based on a linear array antenna has already been proposed, it has problems concerning the mutual coupling effect and polarization mismatch between the transmitter and receiver antennas. The proposed dipole antenna array assisted Doppler spread compensator is not only capable of mitigating both Doppler and fading phenomena, but also of efficiently receiving horizontally polarized radio waves. Computer simulation results showed that the proposed scheme outperforms the conventional monopole array assisted Doppler spread compensator.