作为一位指导或训练员，你是负责观察、带领、或许更是评估训练周期和客户表现的人。

As an instructor or trainer, you are the one who sees, leads, and perhaps even evaluates the training sessions and performances of your clients.

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这种估计方法不需要利用任何训练序列或导频信号，进一步提高了系统频带利用率，降低了计算复杂度。

This estimation algorithm doesn't need any training sequences or pilot signal, therefore improves band efficiency and lower computational complexity.

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