Computer · Digital Communication
__________ एक बहुस्तरीय मॉड्यूलेशन (multilevel modulation) है जिसमें चार अलग-अलग प्रतीकों (symbols) को प्रदर्शित करने के लिए चार फेज शिफ्ट का उपयोग किया जाता है।
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