Which of the following is true concerning quadrature modulation?Question 4Select one:It uses twice the bandwidth compared with modulation of just the in-phase component.It reduced the power requirements compared with an ASK systemIt allows doubling of the transmitted bit rate by modulating in-phase and quadrature components of the carrier.It halves the transmitted bit rate compared with an ASK system, but is more reliable (lower BER) for the same signal power.
Question
Which of the following is true concerning quadrature modulation?Question 4Select one:It uses twice the bandwidth compared with modulation of just the in-phase component.It reduced the power requirements compared with an ASK systemIt allows doubling of the transmitted bit rate by modulating in-phase and quadrature components of the carrier.It halves the transmitted bit rate compared with an ASK system, but is more reliable (lower BER) for the same signal power.
Solution
Para responder a la pregunta sobre la modulación en cuadratura, es importante entender algunos conceptos clave sobre esta técnica de modulación. Vamos a analizar cada una de las opciones proporcionadas:
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"It uses twice the bandwidth compared with modulation of just the in-phase component."
- La modulación en cuadratura no necesariamente usa el doble de ancho de banda en comparación con la modulación solo del componente en fase. En realidad, la modulación en cuadratura es eficiente en términos de ancho de banda porque permite transmitir más información en el mismo ancho de banda.
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"It reduced the power requirements compared with an ASK system."
- La modulación en cuadratura no reduce necesariamente los requisitos de potencia en comparación con un sistema ASK (Amplitude Shift Keying). La potencia requerida depende de varios factores, incluyendo la implementación específica y las condiciones del canal.
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"It allows doubling of the transmitted bit rate by modulating in-phase and quadrature components of the carrier."
- Esta afirmación es correcta. La modulación en cuadratura permite duplicar la tasa de bits transmitida al modular tanto los componentes en fase (I) como en cuadratura (Q) de la portadora. Esto se debe a que se pueden transmitir dos señales independientes simultáneamente.
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"It halves the transmitted bit rate compared with an ASK system, but is more reliable (lower BER) for the same signal power."
- Esta afirmación es incorrecta. La modulación en cuadratura no reduce la tasa de bits transmitida en comparación con un sistema ASK. De hecho, como se mencionó anteriormente, puede duplicar la tasa de bits transmitida.
Por lo tanto, la opción correcta es:
"It allows doubling of the transmitted bit rate by modulating in-phase and quadrature components of the carrier."
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