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| Performance of cooperative transmissions in flat fading environment with asynchronous transmitters | |||
| Li,Xiaohua | State University of New York at Binghamton | ||
| Hwu,Juite | State University of New York at Binghamton | ||
| Channel dispersion is inevitable in asynchronous cooperative transmissions even in flat fading environment, which may greatly degrade the gain of cooperative diversity and cast doubts on their application in wireless sensor networks for energy efficiency or reliability. This paper studies the interference caused by such channel dispersion, and shows that the average SIR can be decreased to 10 dB even in noiseless transmissions. We propose two methods to mitigate the dispersion: a simple sampling time optimization method, and an over-sampling combining method. Simulations show that they can achieve average SIR near 30 dB and near 60 dB, respectively, with two cooperative transmitters. | |||
| Xiaohua(Edward) Li, received B.S. and M.S. degrees from Shanghai Jiao Tong University, Shanghai, China, and Ph.D. degree from the University of Cincinnati, Cincinnati, OH, in 2000. He has been an assistant professor with the Department of Electrical and Computer Engineering, State University of New York at Binghamton, Binghamton, NY, since 2000. His research interests are in the fields of adaptive and array signal processing, signal processing in communications, and wireless communications. | |||