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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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    Performance analysis of MIMO adaptive modulation system over fading channel model
    (2007-12-01)
    Moungnou, Phichet
    ;
    Kungmat, Tharaton
    This paper analyzes the performance of the adaptive modulation system for Multiple Input Multiple Output (MIMO) over Nakagami-m fading channel, which utilizing four modulation modes. The optimization of modulation switching levels are set for maintain the target BER which is desired by many data services. Under this condition, the performance analysis of the throughput and the transmission outage probability of the adaptive modulation for MIMO system are presented. Finally, the simulation results show that the adaptive modulation for open loop and close loop MIMO system can theoretical achieve good performance with high throughput and low transmission outage probability.