Channel estimation is the key technique to implement OFDM system, and is also the hotspot of research.
信道估计是实现OFDM系统的关键技术之一，也是目前研究热点。
Feature modeling is the key technique in the new CAD system, it is the core technique of product model.
特征造型技术是新一代CAD系统的关键技术，是产品模型技术的核心。
The key technique and realization way of this system are respectively presented.
分别描述了该系统的关键技术和实现途径。
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