Title :
Performance study of adaptive modulation/coding in MIMO-OFDM system
Author :
Jing, Shang ; Yan, Gao ; Zhen, Li ; Yi, Man ; Junde, Song
Author_Institution :
Electr. Eng. Dept., Beijing Univ. of Posts & Telecommun., China
Abstract :
MIMO/OFDM is one of the promising technologies to improve the spectral efficiency, enhance system capacity and mitigate intersymbol interference in the fourth generation broadband mobile communication system. In this paper, we aim at the study of a communication system that employs both MIMO-OFDM and adaptive modulation/coding technologies. In this article, the performance of different modulation schemes including fixed modulation/coding and adaptive modulation/coding is analyzed and compared by simulation. We also propose an adaptive modulation/coding algorithm for multiuser MIMO-OFDM system. This adaptive allocation algorithm assigns the subcarriers and bits for users in the system with the minimum total transmission power and targeted bit error rate (BER) based on the time-variant MIMO channel condition. Computer simulation results demonstrate that the proposed algorithm is not only simple but can also have a relative low transmission power compared with the fix BPSK, QPSK and 16QAM modulation schemes.
Keywords :
4G mobile communication; MIMO systems; OFDM modulation; adaptive codes; adaptive modulation; error statistics; intersymbol interference; multi-access systems; time-varying channels; BER; adaptive allocation algorithm; adaptive coding; adaptive modulation; bit error rate; computer simulation; fixed coding; fixed modulation; fourth generation broadband mobile communication system; intersymbol interference mitigation; minimum total transmission power; multiple input multiple output; multiuser MIMO-OFDM system; orthogonal frequency division multiplexing; spectral efficiency improvement; subcarrier assignment; system capacity enhancement; time-variant MIMO channel condition; wireless communication; Analytical models; Bit error rate; Broadband communication; Computational modeling; Intersymbol interference; MIMO; Mobile communication; Modulation coding; OFDM modulation; Performance analysis;
Conference_Titel :
Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on
Print_ISBN :
0-7803-7781-8
DOI :
10.1109/CCECE.2003.1226203
