tailieunhanh - Báo cáo hóa học: " Research Article Transmit Diversity at the Cell Border Using Smart Base Stations"

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: Research Article Transmit Diversity at the Cell Border Using Smart Base Stations | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 60654 11 pages doi 2007 60654 Research Article Transmit Diversity at the Cell Border Using Smart Base Stations Simon Plass Ronald Raulefs and Armin Dammann German Aerospace Center DLR Institute of Communications and Navigation Oberpfaffenhofen 82234 Wessling Germany Received 27 October 2006 Revised 1 June 2007 Accepted 22 October 2007 Recommended by A. Alexiou We address the problems at the most critical area in a cellular multicarrier code division multiple access MC-CDMA network namely the cell border. At a mobile terminal the diversity can be increased by using transmit diversity techniques such as cyclic delay diversity CDD and space-time coding like Alamouti. We transfer these transmit diversity techniques to a cellular environment. Therefore the performance is enhanced at the cell border intercellular interference is avoided and soft handover procedures are simplified all together. By this macrodiversity concepts are exchanged by transmit diversity concepts. These concepts also shift parts of the complexity from the mobile terminal to smart base stations. Copyright 2007 Simon Plass et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The development of future mobile communications systems follows the strategies to support a single ubiquitous radio access system adaptable to a comprehensive range of mobile communication scenarios. Within the framework of a global research effort on the design of a next generation mobile system the European IST project WINNER Wireless World Initiative New Radio 1 is also focusing on the identification assessment and comparison of strategies for reducing and handling intercellular interference at the cell border. For achieving high .