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在有限信道冲激响应较长的情况,由于待估计参数空间的高维数,准确计算最大似然信道估计的复杂度较高,在实际应用中通常采用近似的方法。利用非线性Teager-Kaiser滤波器在抑制噪声的同时可以有效提取信号的特征,定义了一个表征信道参数概率分布的似然比,对该似然函数的最大化是首先得到路径延迟的极值,然后求得复路径衰耗。计算机仿真结果表明,与非似然方法相比,采用该似然函数方法能使联合检测性能得到提高。
In the case of limited channel impulse response, due to the high dimension of the parameter space to be estimated, it is more complicated to accurately calculate the maximum likelihood channel estimation. In practice, the approximate method is usually adopted. The non-linear Teager-Kaiser filter can effectively extract signal characteristics while suppressing noise and defines a likelihood ratio that characterizes the probability distribution of the channel parameters. The maximization of the likelihood function is to obtain the extreme value of the path delay first, Then find the complex path attenuation. Computer simulation results show that compared with the non-likelihood method, using the likelihood function method can improve the joint detection performance.