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
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Abstract	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.
AbstractList	Practically, 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. 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. Practically, 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 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. SUMMARY Practically, 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.
Author	Zhu, Qiuming Yu, Xiangbin Xu, Dazhuan Liu, Xiaoshuai
Author_xml	– sequence: 1 givenname: Xiangbin surname: Yu fullname: Yu, Xiangbin email: Correspondence to: Xiangbin Yu, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China., yxbxwy@nuaa.edu.cn organization: College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China – sequence: 2 givenname: Xiaoshuai surname: Liu fullname: Liu, Xiaoshuai organization: College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China – sequence: 3 givenname: Qiuming surname: Zhu fullname: Zhu, Qiuming organization: College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China – sequence: 4 givenname: Dazhuan surname: Xu fullname: Xu, Dazhuan organization: College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
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Copyright	Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2014 John Wiley & Sons, Ltd.
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Snippet	SUMMARYPractically, the maximum transmission power of transmission systems is limited. This power constraint causes the variable power control derived from no... Practically, the maximum transmission power of transmission systems is limited. This power constraint causes the variable power control derived from no maximum... SUMMARY Practically, the maximum transmission power of transmission systems is limited. This power constraint causes the variable power control derived from no...
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SubjectTerms	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
Title	Adaptive modulation with constrained variable power for space-time coded MIMO systems
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