问题 问答题 简答题

智能天线技术包括哪些主要技术?简述各技术的功能与特点。

答案

参考答案:

智能天线由一个环形的天线阵列和相应的发送接受单元组成,并由相应的算法来控制。与传统的全向天线只产生一个波束不同的是,智能天线系统可以给出多个波束赋形,而每一个波瓣对应于一个特别的手机用户,波束也可以动态地追踪用户。在接收方面,这一技术允许进行空间选择接收,这样不但增加了接收灵敏度,而且还可将来自不同位置手机的共码道干扰降至最小,一增加网络的整体容量。智能天线采用双向波束赋形,在消除干扰的同时增大了系统的容量,并且降低了基站的发射功率要求,即便出现单个天线单元损坏的现象,系统工作也不会因此受到重大影响。

阅读理解

It was near Christmas during my first term teaching at a new school. I loved my small special class more than any group I had taught in the past. They were hungry for knowledge and I was enjoying teaching.

Other teachers had told me that our children were from poor families and not to expect any child to bring a Christmas gift. In fact, I wasn’t expecting any gifts.

Imagine my surprise when every child brought me a gift on the day before our holiday break. First, I got a much-loved toy monkey from a shy girl. I was told, “He is my favorite, but I love you and I want him to be with you, Miss Taylor.” How thrilled I was!

Next came a new set of Christmas tree lights that was “missing” from a mother’s cupboard(碗橱).

Finally, I came to one little boy’s gift which I had never received. It was an old, dirty and broken Christmas storybook. Just when I wanted to show my happiness, I was interrupted(打断) by the giver, “And see, it is new! It still has the price tag(标签).”

When other children laughed at him, I stopped them and said, “Oh, books are good in that way. The story is always new if you have not read it before. Now, Let’s read one together.” Everyone listened quietly as I read the most wonderful Christmas story of my life.

I still keep those Christmas gifts. They always remind me of my lovely kids.

小题1:Miss Taylor loved her small special class so much because______________.

A.this was her first term teaching at a new school

B.these little kids were from rich families

C.the students studied very hard and she enjoyed teaching them

D.she didn’t get any Christmas gifts小题2: ____________ brought Miss Taylor a Christmas gift.

A.Every child

B.Most of the children

C.Only three children

D.No one小题3:Miss Taylor felt __________ when she got the gifts from the children.

A.sad

B.scared

C.thrilled

D.tired小题4:Many gifts were mentioned (被提及) in the article except____________.

A.a toy monkey

B.an old storybook

C.a set of Christmas tree lights

D.a Christmas card

多项选择题