基于锚点拟合的宽带短波信道修正ITS模型

构建仿真系统时,仿真模型直接关系到仿真系统能否实现。针对宽带短波信道ITS模型存在的功率延迟剖面函数不能拟合各种信道条件且计算量较大的问题,提出了修正参考模型,并证明了其有效性与正确性。首先定义锚点,将模型中功率剖面延迟函数的锚点与特定分布中的锚点锁定,再利用拟合的方法根据特定分布确定延迟剖面上的其它点。仿真结果表明:锚点拟合法缩短了信道模型参量的求解时间,且理论上能够拟合短波信道各种延迟分布,验证了修正模型的正确性。修正后的模型通过锁定关键的锚点能灵活拟合真实信道且计算量较小,能够有效地应用于宽带短波信道模拟系统中。

Adjusted ITS Model of Wideband HF Channel Based on Anchor-points Fitting

Models play an important role in the implementation of simulation systems.The Power delay profile(PDP) of ITS model can’t fit all kinds of channel well and its computational complexity is large.An adjusted ITS model was proposed that aimed at solving problems mentioned above.The effectivity and validity of the adjusted model were proved below.Anchor-Point was defined.Firstly,the key anchor-points of PDP were locked and then the other points on the PDP were fitted according to the specific distribution.Anchor-points fitting shortens the time for solving the channel model parameter,and is able to fit a variety of PDP distribution of HF channel.Simulation results verify the validity of adjusted model.Adjusted ITS model fit the real channel well with small computational complexity,and can be applied to wideband HF simulation system effectively.