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Why an OFDM system is very suitable for wideband wireless communications.

提问人：网友owener_10 发布时间：2022-01-07

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更多“Why an OFDM system is very sui…”相关的问题

第1题

Consider a LTE system with system bandwidth 20 MHz...

Consider a LTE system with system bandwidth 20 MHz, Assume that each timeslot consists of 7 OFDM symbols. Each OFDM symbol is obtained by using 2048-point IFFT operation, and only 1200 mid-subcarriers are occupied by signals. if 16QAM modulation iand 2 transmit antennas are used in the downlink, evaluate the peak bit rate in the downlink. If the interspacing of adjacent subcarriers is 15 kHz, evaluate the total bandwidth for signals corresponding to 2048 subcarriers and the occupied bandwidth by signals corresponding to 1200 subcarriers. Explain why the signals do not occupy the whole bandwidth. If the interspacing of adjacent subcarriers is 15 kHz, evaluate the OFDM symbol period. If the interspacing of adjacent subcarriers is 15 kHz, evaluate the sampling rate in the IDFT/ IFFT operation and judge whether or not it satisfies the Nyquist's rule for sampling.

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第2题

Why might a taxpayer elect to depreciate assets using the Alternative Depreciation Sys

tem (ADS)？()I. The taxpayer desires rapid write off of assets.II. The taxpayer may be close to being subject to the alternative minimum tax.III. The taxpayer is experiencing a low income time period.

A、Statements I and III are correct

B、Only statement I is correct

C、Statements II and III are correct

D、Statements I and II are correct

E、Statements I, II, and III are correct

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第3题

Speaker A: The open stack system is marvelous. I love to browse around and just see what b

ooks there are. Speaker B: ______

A．So do I. But I"ve found you can waste a lot of time that way.

B．I don"t know when they started to introduce this new system.

C．I wonder why they don"t add more books on economics to the stacks.

D．What do you think of the service of the librarians？

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第4题

In an OFDM system with 16QAM, the symbol rate of 16QAM is equal to that of OFDM symbol.

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第5题

听力原文：M: I cannot find the reference book the teacher asked us to read.W: Why do you lo

听力原文：M: I cannot find the reference book the teacher asked us to read.

W: Why do you look for it on the shelves？ Why don't you use the searching system in the computer downstairs？

Q: What does the woman suggest the mall do？

(15)

A．He should try a better and convenient way.

B．He should give up looking for the book.

C．He should ask the librarian for help.

D．He should try the shelves downstairs.

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第6题

For an OFDM system with 64QAM, CP is used to eliminate the ISI between adjacent 64QAM symbols

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第7题

if the subcarrier interspacing in an ofdm system is

If the subcarrier interspacing in an OFDM system isf , calculate the normal OFDM symbol duration T.

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第8题

In an OFDM system, if the minimum subcarrier spaci...

In an OFDM system, if the minimum subcarrier spacing isHz, and N-point IFFT is used to realize OFDM modulation, then a the OFDM symbol duration is 1/. b. the sampling duration in OFDM symbols is. c. the sampling rate in OFDM symbols issamples/second. d. the maximum bandwidth of signals isHz。

A、对

B、错

C、对

D、对

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第9题

听力原文：Everyone has heard of the Braille system of reading for the blind. But few people

know why it is called the "Braille" system or who Louis Braille was. In the year 1812,Louis Braille was a very small boy. He lived in a small town in France. Louis' father had a small shop in which he made things of leather. One day Louis was playing in his father's shop and picked up a small tool with a very sharp point, Louis fell, the point of the tool entered his eye. And later he became blind in both eyes. One day, he said to his father," Blind people are the loneliest people in the world. I can tell one bird from another by its sound. I can know the door of the house by feeling it with my hand. But there are so many things which I can not hear and can not feel. Only books can free the blind. But there are no books for us to read."

Why is the reading system for the blind called the Braille？

A．Because it was invented by the person called Braille.

B．Because it was first used by the person called Braille.

C．It is unknown.

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第10题

CP in an OFDM system can be used to a. eliminate ISI between OFDM symbols. b. matain the orthogonality among subcarriers c. eliminate MAI d. improve the cell covarage.

A.对

B.对

C.错

D.错

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