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中文摘要：
针对循环延迟分集（CDD）时延设置的矛盾，提出了一种新的应用于CDD的信道估计方法，在不同导频符号使用不同的循环延迟，导频符号和数据符号使用不同的循环延迟，较大程度地消除了分集增益对时延设置的敏感性．
英文摘要：
Based on the dilemma of delay value in cyclic delay diversity （CDD）, a new transmission scheme based on CDD and its channel estimation method is presented. Delay values are different among symbols with pilot. Those symbols with pilot and symbols with data are different too. With the new channel estimation algorithm, the cyclic delay diversity is robust to the delay value.
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