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提问人：网友smartlyp
发布时间：2022-01-07
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In an OFDM system with 16QAM, the symbol rate of 16QAM is equal to that of OFDM symbol.
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更多“In an OFDM system with 16QAM, the symbol rate of 16QAM is equal to that of OFDM symbol.”相关的问题
第2题
if the subcarrier interspacing in an ofdm system is
If the subcarrier interspacing in an OFDM system is
f , calculate the normal OFDM symbol duration T.
第3题
For an OFDM system with 64QAM, CP is used to eliminate the ISI between adjacent 64QAM symbols
第4题
In an OFDM system, if the minimum subcarrier spaci...
In an OFDM system, if the minimum subcarrier spacing is
Hz, 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 is
samples/second. d. the maximum bandwidth of signals isHz。
A、对
B、错
C、对
D、对
第5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
第6题
The drawbacks of OFDM systems include a. sensitive to the frquency offset. b. sensitive to the timing bias. c. High PAPR d. Complicate in system realization.
A.对
B.对
C.对
D.错
第7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.
第8题
The correct statements include a. a MIMO system can efficiently combat the frequency selec
tive fading, b. a OFDM system can effectively combat the frequency selective fading. c. a space diversity system can efficiently combat frequency selective fading. d. a smart antenna array system can effectively combat the frequency selective fading.
点击查看答案
A、对
B、对
C、对
D、错
第9题
What is Parker's attitude to university in the future？A．Virtual global education system wi
What is Parker's attitude to university in the future？
A．Virtual global education system will replace university in the future.
B．University will continue to play a key role in the future.
C．Residential campus will be integrated into the virtual educational system.
D．Universities should open their doors to every member in a society.
第10题
阅读材料，回答题。Much unfriendly feeling towards computers has been based on the fear of wi
阅读材料，回答题。
Much unfriendly feeling towards computers has been based on the fear of widespread unemployment resulting from their introduction. Computers are often used as part of automated(自动化的) production systems requiring a least possible number of operators, causing the loss of many jobs. This has happened, for example, in many steelworks.
On the other hand, computers do create jobs. They are more skilled and better paid, though fewer in number than those they replace. Many activities could not continue in their present form. without computers, no matter how many people are employed. Examples are the check clearing (交换) system of major banks and the weather forecasting system.
When a form. introduces computers, a few people are usually employed in key posts (such as jobs of operations managers) while other staff are w-trained as operators, programmers, and data preparation staff. After the new system has settled down, people in non-computer jobs are not always replaced when they leave, resulting in a decrease in the number of employees. This decrease is sometimes balanced by a substantial increase in the activity of the frim, resulting from the introduction of computers.
The attitudes of workers towards computers vary. There is fear of widespread unemployment and of the takeover of many jobs by computer-trained workers, making promotion for older workers not skilled in computers more difficult.
On the other hand, many workers regard the trend toward wider use of computers inevitable.They realize that computers bring about greater efficiency and productivity, which will improve the condition of the whole economy, and lead to the creation of more jobs. This view was supported by the former British Prime Minister, James Callaghan in 1954, when he made the point that new technologies hold the key to increased productivity, which will benefit the economy in the long ran.
The unfriendly feeling towards computers is developed from 查看材料
A.the possible widespread unemployment caused by their introduction
B.their use as part of automated production systems
C.the least possible number of operators
D.the production system in steelworks
