Performance analysis of variable-power adaptive modulation in space-time block coded MIMO diversity systems

被引：0
作者：
XiangBin Yu
HuiBin Shi
机构：
[1] Nanjing University of Aeronautics and Astronautics,College of Information Science and Technology
[2] Southeast University,National Mobile Communications Research Laboratory
来源：
Science China Information Sciences | 2010年 / 53卷
关键词：
adaptive modulation; variable power; space-time block code; constant power; multiple input multiple output (MIMO);
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this paper, the performance analysis of multi-antenna MIMO systems with variable-power (VP) adaptive modulation and space-time coding is presented. The fading gain value is partitioned into a number of regions by which we decide the transmission power according to the region the fading gain falls in. The optimum fading gain region boundaries (switching thresholds) for maximizing spectrum efficiency (SE) under a target BER and average power constraint are derived. It is shown that the Lagrange multiplier in the constrained SE optimization will be unique if the existence condition for multi-antenna systems is satisfied, and is unique for single antenna systems. A practical iterative calculation method based on Steepest Descent Algorithm for finding the Lagrange multiplier is proposed. With the switching thresholds, the closed-form expressions of the SE and average BER, respectively for VP system and constant-power (CP) system are achieved. Simulation results for SE and average BER are in good agreement with the theory analysis. The results show that VP adaptive modulation with space-time coding provides better SE than the counterpart with CP under a target BER and average power constraint.
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页码：2106 / 2115
页数：9
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