在M＞4時，MQAM與MPSK哪一種抗噪性能更好？

答案： MQAM（M-ary Quadrature Amplitude Modulation，M進制正交振幅調(diào)制）和MPSK（M-ary Phase Shift Keying，M進制相移鍵控）都是數(shù)字調(diào)制技術(shù)，它們在不同的應(yīng)用場景和條件下有不同的性能表現(xiàn)。在M>4時，MQAM和MPSK的抗噪性能取決于多種因素，包括信噪比（SNR）、調(diào)制階數(shù)M、以及具體的實現(xiàn)方式等。通常，MQAM在高階調(diào)制（即M值較大時）時，其星座點之間的距離會比MPSK小，因此在相同的信噪比條件下，MQAM的誤碼率（BER）會比MPSK高，即抗噪性能相對較差。 MPSK由于其相位的離散性，每個符號之間的相位差是固定的，這使得它在高信噪比環(huán)境下具有更好的性能。然而，隨著M的增加，MPSK星座點之間的最小相位差會減小，這會降低其抗噪性能。在實際應(yīng)用中，MQAM和MPSK的選擇通常取決于系統(tǒng)對數(shù)據(jù)速率和誤碼率的要求，以及可用的帶寬資源。在帶寬受限的情況下，MQAM可能更受歡迎，因為它能夠在給定的帶寬內(nèi)傳輸更多的數(shù)據(jù)。而在對誤碼率要求較高的應(yīng)用中，MPSK可能更受青睞。總結(jié)來說，在M>4時，如果只考慮抗噪性能，MPSK通常比MQAM有更好的性能，尤其是在高信噪比環(huán)境下。然而，實際選擇哪種調(diào)制方式還需要綜合考慮其他因素，如頻譜效率、實現(xiàn)復(fù)雜度、系統(tǒng)設(shè)計要求等。

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下面程序的運行結(jié)果是（)。 include define M 3 define N （M+1) define NM NN／2 void main（) { printf（"％d，"，NM)； printf（"％d＼n"，5NM)； }

A.3，6
B.2，89
C.2，5
D.8，40

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在M＞4時，MQAM與MPSK哪一種抗噪性能更好？

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下面程序的運行結(jié)果是（)。 include define M 3 define N （M+1) define NM N*N／2 void main（) { printf（"％d，"，NM)； printf（"％d＼n"，5*NM)； }

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在M＞4時，MQAM與MPSK哪一種抗噪性能更好？

下面程序的運行結(jié)果是（)。 include define M 3 define N （M+1) define NM NN／2 void main（) { printf（"％d，"，NM)； printf（"％d＼n"，5NM)； }