Adaptive modulation with constrained variable power for space-time coded MIMO systems

SUMMARYPractically, the maximum transmission power of transmission systems is limited. This power constraint causes the variable power control derived from no maximum power limitation suffering from performance degradation. In this paper, a constrained variable‐power adaptive M‐ary quadrature amplit...

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Published in:International journal of communication systems Vol. 27; no. 10; pp. 1637 - 1652
Main Authors: Yu, Xiangbin, Liu, Xiaoshuai, Zhu, Qiuming, Xu, Dazhuan
Format: Journal Article
Language:English
Published: Chichester Blackwell Publishing Ltd 01.10.2014
Wiley Subscription Services, Inc
Subjects:
adaptive modulation
Adaptive systems
Constraints
Mathematical models
Maximum power
Modulation
multi-input multi-output (MIMO)
Polycarbonates
Power control
power limitation
Signal to noise ratio
space-time coding
spectrum efficiency
variable power
ISSN:1074-5351, 1099-1131
Online Access:Get full text
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Summary:SUMMARYPractically, the maximum transmission power of transmission systems is limited. This power constraint causes the variable power control derived from no maximum power limitation suffering from performance degradation. In this paper, a constrained variable‐power adaptive M‐ary quadrature amplitude modulation scheme for MIMO systems with space–time coding is developed. Convex optimization is used to derive the switching thresholds of the instantaneous signal‐to‐noise ratio for power control (PC) and adaptive modulation under the constraints of maximum power, average power, and target BER. In the derivation of the relation between modulation and power, the exact BER expression of binary phase shift keying modulation and a tight bound for higher order quadrature amplitude modulation are used to make the PC scheme fulfill the target BER even at low signal‐to‐noise ratio where the previous PC schemes fail to meet the target BER. Numerical results show that the derived control scheme under the power constraints can obtain the spectrum efficiency and BER performance close to the previous control scheme without power limitation. Moreover, it can satisfy the requirements of power limitation and target BER and can effectively avoid the excessive power consumption of previous PC scheme in poor channel condition. Copyright © 2012 John Wiley & Sons, Ltd. A constrained variable‐power adaptive modulation (AM) scheme for space‐time coded MIMO systems is developed. Convex optimization is used to derive the switching thresholds of the signal‐to‐noise ratio for power control (PC) and AM under the constraints of maximum power, average power, and target BER. Numerical results show that the derived PC can obtain the spectrum efficiency and BER performance close to the previous control scheme without power limitation. Moreover, it satisfies the requirements of power limitation and target BER.
Bibliography:Open Research Fund of National Mobile Communications Research Laboratory, Southeast University - No.N200904
istex:18CD07FACFDD4402FE7B797DCDB95A93EECB4690
National Natural Science Foundation of China - No. 61172077
Doctoral Fund of Ministry of Education of China - No. 20093218120021
ark:/67375/WNG-6LGWQWFS-P
ArticleID:DAC2425
NUAA Research Funding - No. NS2012075
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ISSN:1074-5351
1099-1131
DOI:10.1002/dac.2425