A capacity-maximization-based adaptive modulation and power allocation algorighm fo multicarrier systems

Zhao Yahong; Zhang Zhongpei; Wu Weiling

Volume 25 Issue 7

Jul. 2003

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Article Navigation > Journal of Electronics & Information Technology > 2003 > 25(7): 938-942

Zhao Yahong, Zhang Zhongpei, Wu Weiling. A capacity-maximization-based adaptive modulation and power allocation algorighm fo multicarrier systems[J]. Journal of Electronics & Information Technology, 2003, 25(7): 938-942.

Citation:

Zhao Yahong, Zhang Zhongpei, Wu Weiling. A capacity-maximization-based adaptive modulation and power allocation algorighm fo multicarrier systems[J]. Journal of Electronics & Information Technology, 2003, 25(7): 938-942.

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A capacity-maximization-based adaptive modulation and power allocation algorighm fo multicarrier systems

Received Date: 2001-10-26
Rev Recd Date: 2002-01-14
Publish Date: 2003-07-19

Abstract

Abstract

In this paper, the optimization of channel capacity (equivalent to data throughput) is proposed for variable-rate service, which is solved with the Lagrangian multiplier method based on a simplified BER formula for m-QAM modulation. The closed-form solution for the optimization problem is given and the practical constraint of positive power and modulation mode allocation is solved by null transmission on those deep-faded subcarriers. Finally discrete modulation mode (0, QPSK, 16QAM and 64QAM) is used to approach the optimally allocated continuous modulation mode, and simulation results demonstrate that the capacity loss from this approaching is negligible and QoS is guaranteed.

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References(1)

References

T. Keller, L. Hanzo, Adaptive multicarrier modulation: a convenient frame work for timefrequency processing in wireless communications, Proc. IEEE, 2000, 88(5), 611-640.[2]T. Keller, Lajos Hanzo, Adaptive modulation techniques for duplex OFDM transmission, IEEE Trans. on Vehicular Technology, 2000, 49 (5), 1893-1906.[3]C. Yui Wong, R. S. Cheng, K. B. Lataief, Multiuser OFDM with adaptive subcarrier, bit and power allocation, IEEE J. on Selected Areas in Communications, 1999,17 (10), 1747-1758.[4]S.K. Lai, R. S. Cheng, K. B. Letaief, Adaptive trellis coded MQAM and power optimization for OFDM transmission, Vehicular Technology Confercnce, 1999 IEEE 49th , Houston, 1999, vol.1,290-294[5]Andrea J. Goldsmith, Soon-Ghee Chua, Variable-rate variable-power MQAM for fading channels,IEEE Trans. on Comm., 1997, 45(10), 1218-1229.[6]S.T. Chung, Andrea J. Goldsmith, Degrees of freedom in adaptive modulation: a unified view,IEEE Trans. on Comm., 2001, 49(9), 1561-1571.

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