1. Underwater Acoustic Communications (NSFC Grant 2010, 2014, SCUT Grant 2012, 2014) ▪ Studying the estimation and equalization for underwater acoustic time-varying channels ▪ Developing a practical OFDM implementation prototype with PC, ADC, DAC and hydrophones based on the software-defined radio techniques ▪ Papers are published on WUWNet 2013, 2014, IEEE TCOM 2013 2. Error Probability Analysis for Cross-QAM in Fading Channels (NSFC Grant 2010) ▪ Deduced the closed-form expression for the exact SER of Cross-QAM in AWGN ▪ Obtained the exact expressions of SER and BER in mu-eta fading channels with MRC reception ▪ Papers are published on WPC 2013, IEEE TVT 2011, IEEE CL 2010, EURASIP JWCN 2010 3. Resource Allocation Algorithm in OFDMA (NSFGD Grant 2009) ▪ Proposed a proportional rate greedy algorithm and 3 low-complexity ones for fair scheduling ▪ Papers are published on IEEE CL 2011 and IEEE-TVT 2012 ▪ Method is applied to Chinese patent pending 2011 4. Spectrum Sensing and Physical Layer Security in Cognitive Radio (NSFGD Grant 2009) ▪ Simplified the performance analysis and the threshold calculation of the energy detection ▪ Discussed the optimization to the cooperative sensing with semi-definite programming (SDP) ▪ Studied the optimization to the security problems of the secondary user with SDP ▪ Papers are published on J. Electr. & Inf. Tech.(Chinese) 2011 and J. SCUT 2011 5. Peak-to-Average Power Ratio (PAPR) Problem of OFDM (NSFGD Grant 2006) ▪ Distribution of the PAPR: Derived the PAPR distribution of DMT and OFDM signals with extreme value theory (IET-EL 2003, ICCCAS 2006) ▪ PAPR Reduction Method: Proposed a distribution-transform-based PAPR reduction method to transforms the amplitude distribution of the OFDM signal into the standard power distributions, which has very low PAPR (Chinese J. Electronics.2006, ICCT 2006) ▪ Power Efficiency Optimization: Suggested an analysis formwork to address the tradeoff between PAPR reduction and BER increase (ICCT 2006, ICCCAS 2006, WiCom 2007) ▪ Computation of the PAPR of OFDM Signal: (ICASSP 2003, ICCT 2003, J. Electr. (China) 2005) - Obtained the accurate PAPR value for small N by a root finding of a set of Chebyshev polynomials - Proposed a precise and fast PAPR value computation procedure for arbitrary N by using oversampling IFFT and chirp z-transform | 
