tailieunhanh - Báo cáo hóa học: " Multicarrier Block-Spread CDMA for Broadband Cellular Downlink"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Multicarrier Block-Spread CDMA for Broadband Cellular Downlink | EURASIP Journal on Applied Signal Processing 2004 10 1568-1584 2004 Hindawi Publishing Corporation Multicarrier Block-Spread CDMA for Broadband Cellular Downlink Frederik Petre Wireless Research Interuniversity MicroElectronics Center IMEC Kapeldreef 75 3001 Leuven Belgium Email Geert Leus Electrical Engineering Mathematics and Computer Science Delft University of Technology TUDelft Mekelweg4 2628 CD Delft The Netherlands Email leus@ Marc Moonen Department of Electrical Engineering ESAT Katholieke Universiteit Leuven KULeuven Kasteelpark Arenberg 10 3001 Leuven Belgium Email Hugo De Man Interuniversity MicroElectronics Center IMEC Kapeldreef75 3001 Leuven Belgium Email Received 6 March 2003 Revised 7 November 2003 Effective suppression of multiuser interference MUI and mitigation of frequency-selective fading effects within the complexity constraints of the mobile constitute major challenges for broadband cellular downlink transceiver design. Existing wideband direct-sequence DS code division multiple access CDMA transceivers suppress MUI statistically by restoring the orthogonality among users at the receiver. However they call for receive diversity and multichannel equalization to improve the fading effects caused by deep channel fades. Relying on redundant block spreading and linear precoding we design a so-called multicarrier block-spread- MCBS- CDMA transceiver that preserves the orthogonality among users and guarantees symbol detection regardless of the underlying frequency-selective fading channels. These properties allow for deterministic MUI elimination through low-complexity block despreading and enable full diversity gains irrespective of the system load. Different options to perform equalization and decoding either jointly or separately strike the trade-off between performance and complexity. To improve the performance over multi-input multi-output MIMO multipath