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    Histogram compensation to improve blind modulation detection in adaptive OFDM
    (2009-12-01)
    Lakanchanh, Donekeo
    ;
    Yoshizawa, Shingo
    ;
    Noppanakeepong, Suthichai
    ;
    Miyanaga, Yoshikazu
    This paper proposes a blind modulation detection technique for adaptive orthogonal frequency division multiplexing (Adaptive OFDM) communications. Adaptive modulations are applied to improve communication performance in OFDM over complicated multi-path fading channels. This paper proposes a new method which reduces detection errors in blind modulation and improves communication throughput in adaptive OFDM systems. The new proposed is based on statistical methods using a combination of distance histogram and phase histogram methods. It can improve communication performance and increases a data rate by not sending side information about modulation modes. The proposed method has showed better blind detection performance at lower SNR regions than the previous method. ©2009 IEEE.
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    Combating interference in an indoor wireless-communication system using a phased-array antenna with switched-beam elements
    (2005-06-05)
    Ngamjanyaporn, Phaisan
    ;
    Krairiksh, Monai
    ;
    Bialkowski, Marek
    A phased-array antenna with switched-beam elements used to combat interference in an indoor wireless communication system is described. The array uses 1-bit phase shifters applied to its elements in order to point its main beam in a desired direction and internal switching of elements in order to form nulls towards interference. The array's capability of suppressing interference is verified by studying its radiation patterns and by performing interference-rejection experiments in an indoor multipath environment. © 2005 Wiley Periodicals, Inc.