一种新的频率选择性时变衰落OFDM信道的自适应信道估计
A New Adaptive Channel Estimation for Frequency Selective Time Varying Fading OFDM Channels
摘要：
针对频率选择性时变衰落OFDM信道，提出了一种新的自适应动态信道估计算法。新算法采用了一种新的策略，成功地提高了OFDM符号速率。该算法不使用固定的训练导频序列，而是使用一个逻辑控制器在几个可用的训练模式中进行选择。控制器的选择是基于在两个连续的时刻（这被认为是一个合适的测量信道平稳性），以及从期望的BER的偏差导频符号之间的互相关。系统性能的仿真结果证实了这种新的信道估计技术的有效性，在提高OFDM符号的数据速率，而保持相同的错误概率比传统的非自适应估计方法。
英文摘要：
In this paper a new algorithm for adaptive dynamic channel estimation for frequency selective time varying fading OFDM channels is proposed. The new algorithm adopts a new strategy that successfully increases OFDM symbol rate. Instead of using a fixed training pilot sequence, the proposed algorithm uses a logic controller to choose among several available training patterns. The controller choice is based on the cross-correlation between pilot symbols over two consecutive time instants (which is considered to be a suitable measure of channel stationarity) as well as the deviation from the desired BER. Simulation results of the system performance confirm the effectiveness of this new channel estimation technique over traditional non-adaptive estimation methods in increasing the data rate of OFDM symbols while maintaining the same probability of error.
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