[amp_mcq option1=”BPSK” option2=”8-PSK” option3=”DQPSK” option4=”AFSK” correct=”option3″]<\/p>\n
The correct answer is C. DQPSK.<\/p>\n
DQPSK stands for Differential Quadrature Phase Shift Keying. It is a modulation technique that uses two phases, 0\u00c2\u00b0 and 90\u00c2\u00b0, to represent two binary digits, 0 and 1. The phase of the carrier signal is shifted by 90\u00c2\u00b0 between each symbol. This makes it more robust to noise than other modulation techniques, such as BPSK (Binary Phase Shift Keying).<\/p>\n
BPSK uses only two phases, 0\u00c2\u00b0 and 180\u00c2\u00b0, to represent two binary digits. This makes it less robust to noise than DQPSK.<\/p>\n
8-PSK uses eight phases, 0\u00c2\u00b0, 45\u00c2\u00b0, 90\u00c2\u00b0, 135\u00c2\u00b0, 180\u00c2\u00b0, 225\u00c2\u00b0, 270\u00c2\u00b0, and 315\u00c2\u00b0, to represent eight binary digits. This makes it more efficient than DQPSK, but it is also less robust to noise.<\/p>\n
AFSK stands for Audio Frequency Shift Keying. It is a modulation technique that uses changes in the frequency of a carrier signal to represent binary digits. This is a very old modulation technique that is not very efficient or robust.<\/p>\n
In conclusion, the correct answer is C. DQPSK.<\/p>\n","protected":false},"excerpt":{"rendered":"
[amp_mcq option1=”BPSK” option2=”8-PSK” option3=”DQPSK” option4=”AFSK” correct=”option3″]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[199],"tags":[],"class_list":["post-46049","post","type-post","status-publish","format-standard","hentry","category-wireless-communication","no-featured-image-padding"],"yoast_head":"\n