摘要
针对NC-OFDM(non-contiguous orthogonal frequency)系统子载波非连续且动态变化导致传统等间隔分布的导频序列设计算法计算复杂度高、频谱利用率低和处理时延大等问题,提出了基于交叉熵的最优导频序列位置优化设计算法。算法以最小化系统均方误差为准则,采用交叉熵算法在所有可用子载波中求解目标函数的最优解,有效解决了传统穷举搜索算法计算复杂度高的问题。与传统算法相比,所提算法保证了信道估计精度,降低了系统均方误差和误码率,从整体上提高了系统性能。
The subcarriers of NC-OFDM(non-contiguous orthogonal frequency)system have non-continuous and dynamic characteristics,resulting in high computational complexity,low spectrum utilization and long time delay for equally spaced pilot sequence.A new and optimal pilot design algorithm based on cross entropy is proposed in this paper.The optimal pilot placement is derived by minimizing the mean square error and obtained by cross entropy.The proposed method decreases the computational complexity of conventional algorithms.Simulation results indicate that the proposed pilot design algorithm provides better channel estimation precision as well as MSE and BER performance and improves the system performance,compared with current methods.
出处
《中国科技论文》
CAS
北大核心
2015年第2期134-138,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(61104005)
高等学校博士学科点专项科研基金资助项目(20110042120015)
