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Aiming at these problems, an expectation maximum based MAP algorithm is proposed and the performance is analyzed. The proposed algorithm avoids large matrix operations by using the EM algorithm to decompose the MIMO channel estimation problem into a series of single input single output problems. Besides, a joint estimation is carried out over multiple OFDM symbols in order to enhance the data transmission efficiency and the estimative performance of the proposed algorithm.

该算法利用EM算法把多输入输出信道估计问题化简为一系列独立的单输入输出问题，避免了大规模矩阵运算，降低了MAP算法的计算复杂度；为进一步改善MAP算法的数据传输效率及其估计性能，可通过对多个连续的OFDM符号进行联合信道估计。

With the increasingly expansion of enrolling quantity and the expectation of the examinee, there exist a higher requirement of educational information.

随着招生规模的不断扩大和考生期望值的提高，录取工作的信息化程度要求越来越高。

My son's performance in the test exceeded our expectation.

我儿子在考试中的表现超出了我们的期待。

You know it will soon be over and there's a kind of expectation and excitement in that.

你知道他很快就要结束了，有一种期待和兴奋。

The mathematics teachers in high schools are not only the guarantee of the smooth implement of mathematics course standard but also an executant of the foundation course reform .But a big margin exists between the roles of the mathematics teachers in high schools of the course system and the expectation of the new course. So it is very necessary to relocate the role of the mathematics teachers in the new course.

而中学数学教师不仅是数学课程标准顺利实施的保障者，同时又是基础教育改革的实践者，但是现行课程体系下中学数学教师的角色形象与新课程的期望之间存在着较大的差距，因此重新定位中学数学教师在新课程中的角色是非常必要的。

This service, provided by a team composed of local bilingual agents and expatriates aim to provide all the information those expatriates need to smoothly start their expatriation and find a property that match their needs and living expectation.

由双语代理和外籍员工提供客户所需要的全部信息，方便他们顺利开展国外定居生活并找到符合他们需求和居住期望的物业。

This is also the value expectation of life and moral education.

这也是生命道德教育的价值期望所在。

Secondly, it is the desire and expectation of life.

其次，则是生命的渴望与期待。

I am full of expectation for my life in German Centre Shanghai.

我刚上班不久，我对我在德国中心的生活充满期待。

Each of you is of high expectation of the new life and study here in the university.

大家现在一定憧憬着新的大学生活和学习。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。