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| Subchannel Allocation for Multicarrier CDMA with Adaptive Frequency Hopping and Decorrelating Detection | |||
| Jia,Tao | Department of Electrical and Computer Engineering, NC State University | ||
| Duel-Hallen,Alexandra | Department of Electrical and Computer Engineering, NC State University | ||
| Multicarrier Code-Division Multiple Access (MC-CDMA) system with adaptive frequency hopping (FH) has attracted significant attention in the literature due to its excellent spectral efficiency. A suboptimal water-filling (WF) channel allocation algorithm was previously proposed for the conventional matched filter (MF) detector in the reverse link of this system. However, the performance of the WF algorithm is degraded by the fading-induced near-far problem. We propose a new allocation algorithm to overcome the limitations of the WF algorithm, and demonstrate the resulting BER improvement using simulation. Moreover, we employ the linear decorrelating detector at the receiver of the MC-CDMA system with adaptive FH to improve the spectral efficiency. The proposed allocation algorithm is also extended to this receiver by exploiting the SNR analysis of decorrelator. We demonstrate that the linear decorrelating detector that employs the proposed allocation algorithm is very effective in mitigating MAI, with performance approaching the single user bound for MC-CDMA system with adaptive FH. | |||
| Tao Jia was born in Changsha, China in 1978. He received his B. S. degree in electronics and M. Eng. degree in electrical engineering, both from Peking University, Beijing, China, in 2001 and 2004, respectively. Currently, he is pursuing the Ph. D. degree in electrical engineering at North Carolina State University, Raleigh, NC. From 2001 to 2004, he was a part-time intern at Intel China Research Center, Beijing. He has worked in the areas of digital CDMA transceiver implementation on FPGA, multicarrier CDMA system design, and acoustic echo cancellation. His current research interests include multicarrier CDMA system with adaptive frequency hopping, prediction and estimation of fading channels, and adaptive modulation techniques. | |||