Optimal pilot symbol power allocation under time-variant channels

被引：0
|
作者：
Michal Šimko
Qi Wang
Markus Rupp
机构：
[1] Vienna University of Technology,Institute of Telecommunications
来源：
EURASIP Journal on Wireless Communications and Networking | / 2012卷
关键词：
Mean Square Error; Orthogonal Frequency Division Multiplex; Channel Estimate; Power Allocation; Multiple Input Multiple Output;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Nowadays, most wireless communication systems employ coherent demodulation on the receiver side. Under this circumstance, part of the available transmission resource is reserved and utilized for channel estimation, referred to as pilot symbols. In recent standards, for example long-term evolution (LTE), a certain adjustment is allowed for the power radiated on the pilot symbols. This additional degree of freedom creates space for a further optimization of the system performance. In this article, we consider an orthogonal frequency division multiplexing system and investigate how to distribute the available power between data symbols and pilot symbols under transmissions over time-variant channels so that the overall throughput is maximized. We choose the post-equalization signal-to-interference and noise ratio as the cost function and solve the problem analytically. Simulation results obtained by the Vienna LTE simulator are consistent with the analytical results. With an optimal power distribution between data and pilot symbols, a throughput increase of around 10% can be achieved compared to a system with evenly distributed power between data and pilot symbols.
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