Preamble and pilot symbol design for channel estimation in OFDM systems with null subcarriers

被引：0
|
作者：
Shuichi Ohno
Emmanuel Manasseh
Masayoshi Nakamoto
机构：
[1] Hiroshima University,
来源：
EURASIP Journal on Wireless Communications and Networking | / 2011卷
关键词：
Orthogonal frequency division multiplexing (OFDM); Channel estimation; Semidefinite programming (SDP); Convex optimization; Pilot symbols; Pilot design;
D O I：
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学科分类号：
摘要：
In this article, design of preamble for channel estimation and pilot symbols for pilot-assisted channel estimation in orthogonal frequency division multiplexing system with null subcarriers is studied. Both the preambles and pilot symbols are designed to minimize the l2 or the l∞ norm of the channel estimate mean-squared errors (MSE) in frequency-selective environments. We use convex optimization technique to find optimal power distribution to the preamble by casting the MSE minimization problem into a semidefinite programming problem. Then, using the designed optimal preamble as an initial value, we iteratively select the placement and optimally distribute power to the selected pilot symbols. Design examples consistent with IEEE 802.11a as well as IEEE 802.16e are provided to illustrate the superior performance of our proposed method over the equi-spaced equi-powered pilot symbols and the partially equi-spaced pilot symbols.
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