UP Paper 686 US-W-ODOWN
Iterative CDMA Receiver with EM Channel Estimation and Turbo Decoding
Kwon,HyuckWichita State University
Ustunel,EserWichita State University
Torrieri,DonUS Army Research Laboratory
Min,SeunghyunSamsung Electronics
Kang,DongSamsung Electronics
This paper presents an efficient iterative code-division multiple-access direct-sequence system that uses a turbo code and requires few pilot symbols for carrier estimation and tracking. The signal strength and the noise-power spectral density are separately estimated by applying the expectation maximization (EM) algorithm. The higher throughput of the proposed system relative to a conventional 3rd Generation Partnership Project system is verified through simulations using a Jakes fading environment. The complexity of the proposed EM iterative parameter-estimation scheme is low because the required number of complex multiplications is equal to only four times the fading block size.
Biography of Hyuck M. Kwon for IEEE Hyuck M. Kwon (S’82-M’84-SM’96) was born in Korea on May 9, 1953. He received his B.S. and M.S. degrees in electrical engineering (EE) from Seoul National University, Seoul, Korea, in 1978 and 1980, respectively, and his Ph.D. degree in computer, information, and control engineering from the University of Michigan at Ann Arbor, MI, in 1984. From 1985 to 1989, he was with the University of Wisconsin, Milwaukee, WI, as an assistant professor in EE and CS department. From 1989 to 1993, he was with the Lockheed Engineering and Sciences Company, Houston, TX, as a principal engineer, working for NASA space shuttle and space station satellite communication systems. Since 1993, he has been with the ECE department, Wichita State University, KS, where he is now a full professor. In addition, he held several visiting and consulting positions at communication system industries, and a visiting associate professor position at Texas A&M University, College Station, TX, in 1997. His current research interests are in wireless, code division multiple access (CDMA) spread spectrum, smart antenna, and multiple antenna array communication systems.