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 A Limited Feedback SDMA for Downlink of Multiuser MIMO Communication System | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 947869 13 pages doi 2008 947869 Research Article A Limited Feedback SDMA for Downlink of Multiuser MIMO Communication System Yongming Huang 1 LuxiYang 1 and Ju Liu2 1 School of Information Science and Engineering Southeast University Nanjing 210096 China 2 School of Information Science and Engineering Shandong University Jinan 250100 China Correspondence should be addressed to Yongming Huang huangym@ Received 14 February 2008 Accepted 13 August 2008 Recommended by Christoph F. Mecklenbrauker This paper proposes a limited feedback SDMA scheme of combining opportunistic scheduling and codebook-based multiuser precoding. A new systematic construction for SDMA codebook which comprises a set of precoders for multiple simultaneously active users is first presented. Different from conventional Grassmannian codebook the proposed codebook is designed in terms of array processing and has a cluster-based structure with each cluster generated using a perturbation method. In order to tackle the intractable interuser interference issue inhered in limited feedback SDMA this paper further proposes two novel opportunistic scheduling algorithms which are able to fully exploit the cluster structure of the proposed codebook. The first proposed algorithm schedules the simultaneous users and their preferred precoders in a successive way and is implemented in a Markov-like fashion. The second proposed algorithm is capable of rapidly finding a group of channel-matching users along with their preferred precoders. Simulation results demonstrate that in sparse networks the proposed SDMA exhibits a better throughput performance than the conventional limited feedback SDMA does while both having a comparable feedback overhead. Copyright 2008 Yongming Huang et al. This is an open access article distributed under the Creative Commons Attribution License which permits .
