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提问人：网友cashkan 发布时间：2022-01-07

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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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更多“In an OFDM system, if the minimum subcarrier spaci...”相关的问题

第1题

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

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第2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3题

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

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第4题

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

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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

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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

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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.

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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.

A、对

B、对

C、对

D、错

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第9题

名词解释:OFDM

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第10题

简述OFDM的技术优势。

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