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IEICE Transactions on Communications 2008 E91-B(4):1219-1222; doi:10.1093/ietcom/e91-b.4.1219
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Wireless Communication Technologies

Efficient Transmit Power Allocation with Partial Feedback for Closed-Loop SQRD Based V-BLAST Systems

Hoiyoon JUNG1, Jongsub CHA1 and Hyuckjae LEE1

1 The authors are with the School of Engineering, Information and Communications University, 119 Munjiro Yuseong-gu Daejeon 305-732, Korea. E-mail: myworldya{at}icu.ac.kr


  Abstract

This letter proposes an efficient transmit power allocation using partial channel information feedback for the closed-loop sorted QR decomposition (SQRD) based V-BLAST systems. For the feedback information, the positive real-valued diagonal elements of R are forwarded to the transmitter. With the proposed transmit power allocation that is numerically derived by the Lagrange optimization method, the bit error rate performance of the system can be remarkably improved compare to the conventional open-loop SQRD based V-BLAST systems without increasing the receiver complexity.

Key Words: MIMO, V-BLAST, closed-loop system, transmit power allocation, sorted QR decomposition

Manuscript received June 6, 2007. Manuscript revised November 6, 2007.


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