Channel adaptive power allocation and pilot optimization for OFDM systems
Channel adaptive power allocation and pilot optimization for OFDM systems
复制标题
OFDM 系统的信道自适应功率分配和导频优化
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
N. Beaulieu
中科院分区：
文献类型：
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作者：
Mahdi Karami;N. Beaulieu
设计了一种OFDM自适应资源分配方案，在优化导频符号间距和功率的同时，通过调整数据符号的功率使平均传输速率最大化。假设发射机的信道状态信息不完全，则数据子载波间最优功率负荷的精确解不能用初等函数表示。导出了一个有用的近似，它具有充水函数的简单形式，用于确定基于不完全CSI的最优功率加载函数。数值结果验证了所提自适应资源分配方案的优点。
An adaptive resource allocation scheme is designed for OFDM that maximizes the average transmission rate by adapting the power of the data symbols while optimizing the pilot symbol spacing and power. Assuming imperfect channel state information (CSI) at the transmitter, the exact solution obtained for optimum power loading across data subcarriers can not be expressed in terms of elementary functions. A useful approximation, that has the simple form of a water-filling function, is derived for determining the optimum power loading function that is based on imperfect CSI. The merits of the proposed adaptive resource allocation schemes are corroborated by numerical results.