OQAM/OFDM系统中基于信道估计的原型滤波器设计  

Prototype filter design based on channel estimation for OQAM/OFDM systems

作　　者：刘永进[1] 陈西宏[1] LIU Yongjin;CHEN Xihong(Air and Missile Defense College,Air Force Engineering University,Xi’an 710051,China)

机构地区：[1]空军工程大学防空反导学院

出　　处：《系统工程与电子技术》2020年第1期191-197,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金（61571459）资助课题

摘　　要：针对正交频分复用/交错正交幅度调制系统频率选择性信道,提出了基于信道估计的原型滤波器设计方案。就其导频频谱效率低的问题,提出了能够提高频谱效率的导频结构,并进行了信道估计。用信号与干扰加噪声比的倒数衡量原型滤波器对信道估计的影响并将其作为优化问题的约束条件之一,将最小化阻带能量作为目标函数,对原型滤波器的设计问题进行建模。为了加快收敛速度,保证获得全局最优解,利用基于块的分支定界法对原型滤波器的优化问题进行求解。仿真结果证明了所提方法的有效性。A method based on channel estimation is provided to design the prototype filter in the frequency selective channel of offset quadrature amplitude modulation based orthogonal frequency division multiplexing systems.Considering the low spectral efficiency of the classic preamble,an efficient preamble structure is proposed to save the frequency spectral efficiency.Channel estimation based on this new structure is also obtained.The reciprocal of the signal to interference plus noise ratio(RSINR)is derived to measure the influence of the prototype to channel estimation.After that,the problem of prototype filter design is formulated as an optimization problem under the object of minimizing the stop band energy with constraints on the RSINR.To accelerate the convergence and obtain a global optimal solution,the box based branch and bound algorithm is utilized to solve the optimization problem.Simulation results demonstrate the validity and efficiency of the proposed method.

关 键 词：正交频分复用/交错正交幅度调制 信道估计 原型滤波器设计 信号与干扰加噪声比的倒数 

分 类 号：TN929.5[电子电信—通信与信息系统]