This paper presents a multi-antenna diversity LSi that enables fhe mobile reception of Digital H D W . A unique algorithm of four-branch combination with three-band division method drastically improves the performance of mobile reception, especial& in high-speed environment. The rnie of reception is achieved 97%jeld-iesting result in Japan, INTRODUCTIONThe terrestrial digital TV broadcast has started since

Two pre-FFT adaptive array (AA) antenna combiners and a post-FFT carrier diversity (CD) combiner are integrated with a Japan Terrestrial digital TV (ISDB-T) OFDM receiver using 90 nm 7M1P CMOS process. A 2/4/8-antenna diversity receiver can be configured and a low-cost 4 antenna diversity reception system can be realized in one LSI by making use of the AA-CD two-stage diversity combining method. Mobile reception performance is increased by 1.63 times using a denoise filter circuit and SPLINE interpolator under urban 6-path Rayleigh fading (TU6) model with 2-antenna post-FFT carrier diversity (2CD) combing mode. The die area is 49  and the power consumption is 310 mW.

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This paper presents a robust two-antenna digital TV receiver optimized for portable handsets with ultra-high interference cancellation capability. An adaptive array direction control system drastically enhances desired OFDM signals, and it compensates undesired interference signals. An FPGA prototype of the Japanese ISDB-T 1-segment receiver demonstrates the improvement of D/U ratio by maximally 13 dB. Thus, any interference, e.g. analog TV signal, can be completely eliminated.

Two array antennas and one carrier diversity combiners are integrated with Japan Terrestrial digital TV (ISDB-T) OFDM receiver using 90nm 7M1P CMOS process. A 2/4/8 antennas diversity receiver can be configured and the low cost 4 antennas diversity reception system can be realized by one LSI. The mobile reception performance is increase by 63% using de-noise filter circuit and SPLINE interpolator. The die area is 49mm 2 and the power consumption is 310mW.