There are lots of disadvantages in wireless environment, such as multi-paths fading, Doppler frequency shift and fast time varying of channel.

无线环境中存在多径衰落、 多谱勒频移和信道快速时变等许多不利因素。

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OFDM technology is a kind of transmitting way to solve effectively the inter symbol interference caused by multi-paths.

OFDM技术是一种可有效解决多径造成符号间干扰的传输手段。

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The most popular viewing areas can get crowded with admirers, but it is also possible to take in the colour by taking a multi-day trek through the mountains or roaming the paths of an out-of-the-way public garden.

BBC: K��y��: Japan��s autumn explosion of colour