Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation
Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation
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DOI：
10.1049/iet-com.2012.0029
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Jinfeng Du;P. Xiao;Jinsong Wu;Qingchun Chen
中科院分区：
文献类型：
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作者：
Jinfeng Du;P. Xiao;Jinsong Wu;Qingchun Chen
正交频分复用（OFDM）技术在有线和无线通信系统中得到了越来越广泛的应用。然而，在传统的OFDM系统中，循环前缀（CP）的插入和用于信道估计目的的周期性训练序列的传输降低了系统的频谱效率。作为OFDM的替代方案，基于各向同性正交变换算法（IOTA）的多载波系统采用具有良好时频局部化特性的适当脉冲整形，在不使用CP的情况下避免干扰并保持子载波之间在真实的域的正交性。在这项研究中，作者提出了线性预编码IOTA为基础的多载波系统，实现盲信道估计，利用预编码引入的自相关和互相关矩阵的结构。仿真结果表明，与传统的OFDM系统相比，基于IOTA的多载波系统具有更好的功率和频谱效率。
Orthogonal frequency division multiplexing (OFDM) technique has gained increasing popularity in both wired and wireless communication systems. However, in the conventional OFDM systems the insertion of a cyclic prefix (CP) and the transmission of periodic training sequences for purpose of channel estimation decrease the system's spectral efficiency. As an alternative to OFDM, isotropic orthogonal transform algorithm (IOTA)-based multicarrier system adopts a proper pulse shaping with good time and frequency localisation properties to avoid interference and maintain orthogonality in real field among sub-carriers without the use of CP. In this study, the authors propose linearly precoded IOTA-based multicarrier systems to achieve blind channel estimation by utilising the structure of auto-correlation and cross-correlation matrices introduced by precoding. The results show that the proposed IOTA-based multicarrier systems achieve better power and spectral efficiency compared with the conventional OFDM systems.