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【单选题】
正规半日潮港是指（）。
A.
在一个太阴日中有两次高潮和两次低潮的港口
B.
在一个太阴日中有两次高潮和两次低潮，涨落潮时间、相邻的高潮或低潮潮高几乎相等的港口
C.
在一个太阴日中有两次高潮和两次低潮，但涨落潮时间不等的港口
D.
一个月内有半个月是每天有两次高潮和两次低潮的港口
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举一反三
【单选题】在经验之塔中,最高层是( )
A.
言语和视觉符号
B.
录音广播
C.
观摩示范
D.
设计的经验
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【判断题】For AWGN channel, QPSK with Gray mapping can achieve the same bit error rate as a coherent BPSK in white Gaussian noise, but the bandwidth efficiency of BPSK is twice that of QPSK.
A.
正确
B.
错误
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【单选题】About QPSK, the incorrect statement isa. The SER performance of QPSK in an ideal AWGN channel is equal to that of BPSKb. Each QPSK symbol corresponds to two bits.c. The spectrum efficiency of QPSK is ...
A.
只有这个说法是错的，但答案是对的
B.
答案不对
C.
答案不对
D.
答案不对
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【判断题】For AWGN channel, 16-PSK requires less signal energy than the 16-FSK for the fixed noise power spectrum density and symbol error rate.
A.
正确
B.
错误
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【简答题】虽然跑步在日常生活中经常看见,但是我们可能从来没有仔细的分析每一个动作。根据下图 走路和跑步, 请临摹如图 跑步关键帧图(拍照附件上传),并从 脚离地、关键帧姿势、身体重心 等角度简述跑步和走路的主要区别。 相关资料链接 http://blog.sina.com.cn/s/blog_6b5953170100wgji.html
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【多选题】Regarding the ML decision rule for signal transmissions over AWGN channel, the statements _______________ are correct.
A.
The ML decision rule is to choose the message point closest to the received signal point.
B.
The ML decision rule always equals to the MAP rule.
C.
The MAP and ML decision rules can be conditionally equivalent.
D.
The ML decision rule can minimize the probability of error.
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【多选题】Comparing QPSK and BPSK transmitted over AWGN channel, _______________.
A.
QPSK can achieve the same bit error rate as BPSK.
B.
QPSK can achieve the same symbol error rate as BPSK.
C.
the bandwidth efficiency of QPSK is the same as that of BPSK.
D.
the bandwidth efficiency of QPSK is twice that of BPSK.
查看完整题目与答案
【多选题】For a given signal constellation, the average probability of symbol error incurred in maximum likelihood signal detection over an AWGN channel is invariant to the _________________ of the signal const...
A.
compression
B.
translation
C.
expansion
D.
rotation
查看完整题目与答案
【简答题】（九）用量角器画一画．&n1qp;&n1qp;&n1qp;&n1qp; 中0°、九65°&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp; （2）用一副三角板拼出下面度数二角，并画出来． 65°、九20°．
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【简答题】上传跑步姿势照片
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相关题目：
【单选题】在经验之塔中,最高层是( )
A.
言语和视觉符号
B.
录音广播
C.
观摩示范
D.
设计的经验
查看完整题目与答案
【判断题】For AWGN channel, QPSK with Gray mapping can achieve the same bit error rate as a coherent BPSK in white Gaussian noise, but the bandwidth efficiency of BPSK is twice that of QPSK.
A.
正确
B.
错误
查看完整题目与答案
【单选题】About QPSK, the incorrect statement isa. The SER performance of QPSK in an ideal AWGN channel is equal to that of BPSKb. Each QPSK symbol corresponds to two bits.c. The spectrum efficiency of QPSK is ...
A.
只有这个说法是错的，但答案是对的
B.
答案不对
C.
答案不对
D.
答案不对
查看完整题目与答案
【判断题】For AWGN channel, 16-PSK requires less signal energy than the 16-FSK for the fixed noise power spectrum density and symbol error rate.
A.
正确
B.
错误
查看完整题目与答案
【简答题】虽然跑步在日常生活中经常看见,但是我们可能从来没有仔细的分析每一个动作。根据下图 走路和跑步, 请临摹如图 跑步关键帧图(拍照附件上传),并从 脚离地、关键帧姿势、身体重心 等角度简述跑步和走路的主要区别。 相关资料链接 http://blog.sina.com.cn/s/blog_6b5953170100wgji.html
查看完整题目与答案
【多选题】Regarding the ML decision rule for signal transmissions over AWGN channel, the statements _______________ are correct.
A.
The ML decision rule is to choose the message point closest to the received signal point.
B.
The ML decision rule always equals to the MAP rule.
C.
The MAP and ML decision rules can be conditionally equivalent.
D.
The ML decision rule can minimize the probability of error.
查看完整题目与答案
【多选题】Comparing QPSK and BPSK transmitted over AWGN channel, _______________.
A.
QPSK can achieve the same bit error rate as BPSK.
B.
QPSK can achieve the same symbol error rate as BPSK.
C.
the bandwidth efficiency of QPSK is the same as that of BPSK.
D.
the bandwidth efficiency of QPSK is twice that of BPSK.
查看完整题目与答案
【多选题】For a given signal constellation, the average probability of symbol error incurred in maximum likelihood signal detection over an AWGN channel is invariant to the _________________ of the signal const...
A.
compression
B.
translation
C.
expansion
D.
rotation
查看完整题目与答案
【简答题】（九）用量角器画一画．&n1qp;&n1qp;&n1qp;&n1qp; 中0°、九65°&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp;&n1qp; （2）用一副三角板拼出下面度数二角，并画出来． 65°、九20°．
查看完整题目与答案
【简答题】上传跑步姿势照片
查看完整题目与答案