TAILIEUCHUNG - Báo cáo hóa học: "Research Article Efficient Transmission Schemes for Multiuser MIMO Downlink with Linear Receivers and Partial Channel State Information"

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 Efficient Transmission Schemes for Multiuser MIMO Downlink with Linear Receivers and Partial Channel State Information | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 572675 12 pages doi 2010 572675 Research Article Efficient Transmission Schemes for Multiuser MIMO Downlink with Linear Receivers and Partial Channel State Information Mohsen Eslami1 2 and Witold A. Krzymien1 2 1 Electrical Computer Engineering University of Alberta Edmonton Alberta Canada T6G 2V4 2TRLabs Edmonton Alberta Canada T5K2M5 Correspondence should be addressed to Witold A. Krzymien wak@ Received 18 August 2009 Accepted 10 May 2010 Academic Editor Alex B. Gershman Copyright 2010 M. Eslami and W. A. Krzymien. 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. Downlink of a multiuser MIMO system is considered in which the base station BS and the user terminals are both equipped with multiple antennas. Efficient transmission schemes based on zero-forcing ZF linear receiver processing eigenmode transmission and partial channel state information CSI at the BS transmitter are proposed. The proposed schemes utilize a handshaking procedure between the BS and the users to select schedule a subset of users and determine the precoding matrix at the BS. The advantage of the proposed limited feedback schemes lies in enabling relatively low-complexity user scheduling algorithms and high sum-rate throughput even for a small pool of users. For large user pools and when the number of antennas at each user terminal is at least equal to the number of antennas at the BS we show that the proposed scheme is asymptotically optimum. 1. Introduction Increasing demand for broadband wireless services calls for much higher throughputs in future wireless communication systems. It has been shown that with the use of multiple antennas at the transmitter Tx and the receiver Rx the capacity of a .

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