tailieunhanh - Báo cáo hóa học: " Research Article Symbol Error-Rate Analysis of OSTB Codes and Linear Precoder Design for MIMO Correlated Keyhole Channels"

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 Symbol Error-Rate Analysis of OSTB Codes and Linear Precoder Design for MIMO Correlated Keyhole Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 571827 10 pages doi 2008 571827 Research Article Symbol Error-Rate Analysis of OSTB Codes and Linear Precoder Design for MIMO Correlated Keyhole Channels Pradeepa Yahampath1 and Are Hjprungnes2 1 Department of Electrical and Computer Engineering University of Manitoba 75A Chancellor s Circle Winnipeg MB Canada R3T 5V6 2 UniK-University Graduate Center University of Oslo Instituttveien 25 . Box 70 2027 Kjeller Norway Correspondence should be addressed to Pradeepa Yahampath pradeepa@ Received 19 July 2007 Revised 24 January 2008 Accepted 17 March 2008 Recommended by Alex Gershman Analytical expressions for the symbol error rate SER of MIMO systems are important from both design and analysis point of views. This paper derives exact and easy to evaluate analytical expression for the SER of an orthogonal space-time block coded OSTBC MIMO system with spatially correlated antennas in which the channel signal propagation suffers from a degenerative effect known as a keyhole. These expressions are valid for complex valued correlations between antenna elements. Numerical results obtained by simulations are presented to confirm the validity of the analytical SER expressions for several multilevel modulation schemes. Subsequently a procedure for designing a linear precoder which exploits the knowledge of the channel correlation matrix at the transmitter to enhance the performance of the above system is given. To this end the exact SER expression is minimized by using a gradient descent algorithm. To demonstrate the performance improvements achievable with the proposed precoder numerical results obtained in several design examples are presented and compared. Copyright 2008 P. Yahampath and A. Hjorungnes. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and .