Abstract
In this paper, we exploit transmit diversity in downlink multicarrier CDMA (MC-CDMA) system to provide a solution to a high data rate, high capacity, yet reliable and robust to fading channel network. Our first emphasis is on designing a blind (without knowing the undesired users' signatures and channel parameters) MC-CDMA receiver in the mobile station that can suppress the multiple access interference (MAI) and combine the desired signal stemmed from all the transmitting antennas. Two blind signal reception algorithms are proposed and the performances in terms of signal-to-interference-and-noise-ratio (SINR) are comprehensively analyzed. One is based on the decorrelating RAKE (DRAKE) scheme proposed in [IEEE Trans. Communs. 47(7), 1036–1045, 1999] and the other is designed to meet the minimum output energy (MOE) criterion [IEEE Trans. on Information Theory 41(4), 944–996, 1995]. The MOE receiver, though optimum in ideal situation, is semi-blind that the vector channel impulse responses (VCIR) should be explicitly known. While the proposed modified DRAKE receiver is completely blind that it does not require any information of VCIR. Furthermore, we demonstrate that in practical scenario, the modified DRAKE scheme substantially outperforms the MOE receiver. The second part of this paper is to develop an efficient and blind (without requiring training sequences) algorithm to estimate the VCIR of downlink antenna array MC-CDMA system. Simulation results show that both the channel estimation algorithm and the blind reception schemes are reliable and near-far resistant.
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Wei-Chiang Wu received the M.S. and Ph.D. degrees both in electrical engineering from the National Tsing Hua University, Hsin-chu, Taiwan, R.O.C., in 1992 and 1998, respectively. From 1992 to 1994, he was an assistant researcher in the Communication Department at Chung Shan Institute of Science and Technology (CSIST), Taiwan, R.O.C.. From 1998 to 2000, hewas in the Army of Taiwan, where he conducted the research of Integrated Logistic Support (ILS). Since 2000, he has been an assistant Professor at the Department of Electrical Engineering, Da Yeh University, Changhua, Taiwan. His current research interests are in multiuser detection, smart antenna technology, multi-carrier CDMA and ultra-wideband (UWB) impulse radio (IR) technology.
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Wu, WC. Blind Signal Reception and Channel Estimation in Downlink MC-CDMA Communication System with Transmit Diversity. Wireless Pers Commun 39, 467–486 (2006). https://doi.org/10.1007/s11277-006-9092-z
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DOI: https://doi.org/10.1007/s11277-006-9092-z