The power efficiency of the M ary PSK decreases because of the _____(a) Freely packed constellation(b) Increment of bandwidth efficiency(c) Fixed null bandwidth(d) Densely packed constellationThis question was addressed to me during an online interview.My question comes from Combined Linear and Constant Envelope Modulation Techniques topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

The power efficiency of the M ary PSK decreases because of the _____(a

1.	The power efficiency of the M ary PSK decreases because of the _____(a) Freely packed constellation(b) Increment of bandwidth efficiency(c) Fixed null bandwidth(d) Densely packed constellationThis question was addressed to me during an online interview.My question comes from Combined Linear and Constant Envelope Modulation Techniques topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile
Answer» CORRECT choice is (d) Densely packed constellation Best explanation: Bandwidth efficiency increases as the VALUE of M increases. But at the same TIME, increasing M IMPLIES that the constellation is more densely packed. Hence the power efficiency or noise tolerance is decreased.

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