tailieunhanh - Báo cáo hóa học: " Diversity Properties of Multiantenna Small Handheld Terminals"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Diversity Properties of Multiantenna Small Handheld Terminals | EURASIP Journal on Applied Signal Processing 2004 9 1340-1353 2004 Hindawi Publishing Corporation Diversity Properties of Multiantenna Small Handheld Terminals Wim A. Th. Kotterman Department of Communication Technology KOM Aalborg University 9220 Aalborg 0 Denmark Email wim@ Gert F. Pedersen Department of Communication Technology KOM Aalborg University 9220 Aalborg 0 Denmark Email gfp@ Kim Olesen Department of Communication Technology KOM Aalborg University 9220 Aalborg 0 Denmark Email ko@ Received 23 June 2003 Revised 26 February 2004 Experimental data are presented on the viability of multiple antennas on small mobile handsets based on extensive measurement campaigns at GHz with multiple base stations indoors from outdoor to indoor and outdoors. The results show medium to low correlation values between antenna branch signals despite small antenna separations down to . Amplitude distributions are mainly Rayleigh-like but for early and late components steeper than Rayleigh. Test users handling the measurement handset caused larger delay spread increased the variability of the channel and induced rather large mean branch power differences of up to 10 dB. Positioning of multiple antennas on small terminals should therefore be done with care. The indoor channels were essentially flat fading within 7 MHz bandwidth -6dB the outdoor-to-indoor and outdoor channels measured with 10 MHz bandwidth were not. For outdoor-to-indoor and outdoor channels we found that different taps in the same impulse response are uncorrelated. Keywords and phrases mobile radio channel small multiantenna devices measurement analysis branch correlation Doppler spectrum user influence. 1. INTRODUCTION Research on smart antennas or smart algorithms seem to have focused on base stations BSs and fixed terminals with relatively little research being devoted to the benefits of multiple antennas on small mobile terminals. A reason for this surely must be the .

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