[1] Zhao YishengLi XiLi YiJi Hong,. Dynamic resource allocationfor high-speed railway downlink MIMO-OFDM system [J]. Journal of Southeast University (English Edition), 2012, 28 (3): 266-271. [doi:10.3969/j.issn.1003-7985.2012.03.002]

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Dynamic resource allocationfor high-speed railway downlink MIMO-OFDM system()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

28

Issue:

2012 3

Page:

266-271

Research Field:

Information and Communication Engineering

Publishing date:

2012-09-30

Info

Title:

Dynamic resource allocationfor high-speed railway downlink MIMO-OFDM system

Author(s):

Zhao YishengLi XiLi YiJi Hong

Key Laboratory of Universal Wireless Communications of Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China

Keywords:

dynamic resource allocation;  high-speed railway;  multiple-input multiple-output(MIMO);  orthogonal frequency-division multiplexing(OFDM)

PACS:

TN91

DOI:

10.3969/j.issn.1003-7985.2012.03.002

Abstract:

The dynamic resource allocation problem in high-speed railway downlink orthogonal frequency-division multiplexing(OFDM)systems with multiple-input multiple-output(MIMO)antennas is investigated. Sub-carriers, antennas, time slots, and power are jointly considered. The problem of multi-dimensional resource allocation is formulated as a mixed-integer nonlinear programming problem. The effect of the moving speed on Doppler shift is analyzed to calculate the inter-carrier interference power. The optimization objective is to maximize the system throughput under the constraint of a total transmitted power that is no greater than a certain threshold. In order to reduce the computational complexity, a suboptimal solution to the optimization problem is obtained by a two-step method. First, sub-carriers, antennas, and time slots are assigned to users under the assumption of equal power allocation. Next, the power allocation problem is solved according to the result of the first-step resource allocation. Simulation results show that the proposed multi-dimensional resource allocation strategy has a significant performance improvement in terms of system throughput compared with the existing one.

References:

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[2] Zhang Y J, Letaief K B. An efficient resource-allocation scheme for spatial multiuser access in MIMO/OFDM systems [J]. IEEE Transactions on Communications, 2005, 53(1): 107-116.
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[8] Gazor S, Alsuhaili K. Communications over the best singular mode of a reciprocal MIMO channel [J]. IEEE Transactions on Communications, 2010, 58(7): 1993-2001.
[9] Goldsmith A. Wireless communications [M]. Cambridge, UK: Cambridge University Press, 2005.
[10] Wang T, Prokis J G, Masry E, et al. Performance degradation of OFDM systems due to Doppler spreading [J]. IEEE Transactions on Wireless Communications, 2006, 5(6): 1422-1432.
[11] Wong C Y, Cheng R S. Multi-user OFDM with adaptive subcarrier, bit, and power allocation [J]. IEEE Journal on Selected Areas in Communications, 1999, 17(10): 1747-1758.

Memo

Memo:

Biographies: Zhao Yisheng(1984—), male, graduate; Ji Hong(corresponding author), female, doctor, professor, jihong@bupt.edu.cn.
Foundation items: The National Science and Technology Major Project(No.2011ZX03001-007-03), the National Natural Science Foundation of China(No.61271182).
Citation: Zhao Yisheng, Li Xi, Li Yi, et al. Dynamic resource allocation for high-speed railway downlink MIMO-OFDM system[J].Journal of Southeast University(English Edition), 2012, 28(3):266-271.[doi:10.3969/j.issn.1003-7985.2012.03.002]

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