Tag: QPSK

MQTT & IOT AUTOMATION RESEARCH

modulation – Why does NB-IoT use standard QPSK in multi-tone transmission, when pi/4 QPSK is implemented for single-tone?

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I’ve been studying the modulation schemes used in NB-IoT communication, with a particular focus on energy efficiency. I’ve noticed that QPSK (Quadrature Phase Shift Keying) is used in multi-tone transmission,…Read moremodulation – Why does NB-IoT use standard QPSK in multi-tone transmission, when pi/4 QPSK is implemented for single-tone?

RESEARCH

Sci-Hub | Digital coherent quadrature phase-shift-keying (QPSK). 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference

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Sci-Hub | Digital coherent quadrature phase-shift-keying (QPSK). 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference | 10.1109/OFC.2006.215738 ◂ ↓ save Koc, U., Leven, A., Chen, Y.,…Read moreSci-Hub | Digital coherent quadrature phase-shift-keying (QPSK). 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference

DATA MANAGEMENT RESEARCH

In a digital continuous-time communication system, the bit rate of NRZ data stream is 1 Mbps and carrier frequency of transmission is 100 MHz. What is the bandwidth requirement of the channel in BPSK and QPSK systems respectively?a)2 MHz and 4 MHzb)1 MHz and 2 MHzc)4 MHz and 2 MHzd)2 MHz and 1 MHzCorrect answer is option ‘D’. Can you explain this answer?

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Question Description In a digital continuous-time communication system, the bit rate of NRZ data stream is 1 Mbps and carrier frequency of transmission is 100 MHz. What is the…Read moreIn a digital continuous-time communication system, the bit rate of NRZ data stream is 1 Mbps and carrier frequency of transmission is 100 MHz. What is the bandwidth requirement of the channel in BPSK and QPSK systems respectively?a)2 MHz and 4 MHzb)1 MHz and 2 MHzc)4 MHz and 2 MHzd)2 MHz and 1 MHzCorrect answer is option ‘D’. Can you explain this answer?