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IEICE Transactions on Communications 2008 E91-B(1):127-138; doi:10.1093/ietcom/e91-b.1.127
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cognitive Radio and Spectrum Sharing Technology -- Papers -- Enabling Technology

Implementation of Joint Pre-FFT Adaptive Array Antenna and Post-FFT Space Diversity Combining for Mobile ISDB-T Receiver

Dang Hai PHAM1,2, Jing GAO1, Takanobu TABATA3, Hirokazu ASATO2, Satoshi HORI3 and Tomohisha WADA1,2

1 The authors are with the Faculty of Engineering, Dept. of Information Engineering, Univ. of the Ryukyus, Okinawa-ken, 903-0213 Japan. E-mail: phdang{at}lsi.ie.u-ryukyu.ac.jp, 2 The authors are with Magna Design Net Inc., Naha-shi, 901-0152 Japan., 3 The authors are with Kojima Press Industry Co., Ltd., Aichi-ken, 470-0207 Japan.


  Abstract

In our application targeted here, four on-glass antenna elements are set in an automobile to improve the reception quality of mobile ISDB-T receiver. With regard to the directional characteristics of each antenna, we propose and implement a joint Pre-FFT adaptive array antenna and Post-FFT space diversity combining (AAA-SDC) scheme for mobile ISDB-T receiver. By applying a joint hardware and software approach, a flexible platform is realized in which several system configuration schemes can be supported; the receiver can be reconfigured on the fly. Simulation results show that the AAA-SDC scheme drastically improves the performance of mobile ISDB-T receiver, especially in the region of large Doppler shift. The experimental results from a field test also confirm that the proposed AAA-SDC scheme successfully achieves an outstanding reception rate up to 100% while moving at the speed of 80km/h.

Key Words: adaptive array antenna, space diversity combining, OFDM, ISDB-T, FPGA, DSP

Manuscript received May 8, 2007. Manuscript revised July 20, 2007.


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