Question
Download Solution PDFIn which modulation technique is the carrier modulated using phase shifts of 0°, 90°, 180°, and 270°?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFQPSK modulation represents symbols by a constellation of four-phase angles of the carrier signal, orthogonal to each other.
There are two bits per symbol. So for example 00 = 0°, 01 = 90° , 10 = 180° and 11= 270°.
QPSK transmits twice the data rate in a given bandwidth compared to BPSK, at the same BER.
The constellation diagram for 4 different symbols is as shown:
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