However, for the wireless mobile communication systems, the radio channel is frequency selective and time-varying.

对于无线通信系统，无线信道不仅是频率选择性的，而且是时变的。

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The research and development of this task deal with the integrated technologies, such as radio frequency identification, application-embedded, wireless communication and management of data base, etc.

本课题的研究和开发涉及了无线射频识别、嵌入式、无线通讯、数据库管理等综合技术。

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With the rapid development of the communication technique and the growing demand of the markets, the better performance of radio-frequency (RF) wireless receivers is requested.

随着现代通信技术的飞速发展和市场需求的不断提高，对射频接收机的性能提出了更高要求。

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