If the subcarrier interspacing in an OFDM system isf , calculate the normal OFDM symbol duration T.
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
A.对
B.对
C.错
D.错
A.对
B.对
C.对
D.错
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.
A、对
B、对
C、对
D、错
A.changes
B.charges
C.challenges
D.chances
听力原文:M: Do you prefer this new operation system to the old one?
W: I'm not sure. I think it quite complicated and it may take time to get familiar.
What does the woman think about the system?
A.The system is too complicated.
B.The system is familiar to her.
C.The system is not familiar to her.
D.She is not sure about the system.
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