Title :
Robust adaptive modulation for MIMO systems
Author :
Zhang, Raman ; Yang, Aimin ; Liu, Siyang ; Xie, Gang ; Liu, Yuanan
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
This paper investigates adaptive modulation (AM) algorithm to maximize transmission rate under bit error rate (BER) and transmit power constraints for multiple-input multiple-output (MIMO) systems with imperfect channel state information (CSI). The continuous results for the optimization problem are derived by Lagrange method and adjusted into even integers for practical use by two proposed schemes. Different from conventional AM algorithms, the proposed robust algorithm can satisfy system BER requirement even when CSI is subject to significant imperfection. Simulation results show this algorithm provides not only the more robust BER performance to CSI imperfection, but also higher spectral efficiency than the AM algorithm based on perfect CSI assumption.
Keywords :
MIMO communication; adaptive modulation; error statistics; BER requirement; Lagrange method; MIMO systems; bit error rate; imperfect channel state information; multiple-input multiple-output systems; perfect CSI assumption; robust adaptive modulation; spectral efficiency; Algorithm design and analysis; Bit error rate; Channel state information; Delay effects; Delay estimation; Fading; MIMO; Radio transmitters; Robustness; Wireless communication;
Conference_Titel :
Communications and Networking in China, 2008. ChinaCom 2008. Third International Conference on
Conference_Location :
Hangzhou
Print_ISBN :
978-1-4244-2373-6
Electronic_ISBN :
978-1-4244-2374-3
DOI :
10.1109/CHINACOM.2008.4685212
