Pilot design for non-contiguous spectrum usage in OFDM-based cognitive radio networks
Pilot design for non-contiguous spectrum usage in OFDM-based cognitive radio networks
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发表时间：
2012-10
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通讯作者：
Emmanuel C. Manasseh;S. Ohno;M. Nakamoto
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作者：
Emmanuel C. Manasseh;S. Ohno;M. Nakamoto
本文针对非连续正交频分复用（NC-OFDM）认知无线电（CR）系统中信道状态信息（CSI）的提供所面临的挑战进行了研究。我们提出一种利用凸优化和交叉熵（CE）优化来设计导频符号的新方案，使频率选择信道的信道估计均方误差（MSE）最小化。仿真结果表明，与等功率导频设计相比，所提出的导频符号设计具有更好的信道估计MSE和误码率性能。
In this paper, challenges regarding the provision of channel state information (CSI) in non-contiguous orthogonal frequency division multiplexing (NC-OFDM) cognitive radio (CR) systems are addressed. We propose a novel scheme that utilizes convex optimization together with the cross entropy (CE) optimization to design pilot symbols that minimizes the channel estimate mean squared error (MSE) of frequency selective channels. Simulation results indicate that, the proposed pilot symbol design provides better channel estimate MSE as well as the bit error rate (BER) performance when compared with the equal powered pilot design.