What is indicative of a larger range of modulation error in QAM signals?

In Quadrature Amplitude Modulation (QAM), a larger range of modulation error typically indicates that the QAM signal is subject to various forms of interference or distortion, leading to a deterioration in its quality. Signal distortion can arise from factors such as non-linearities in the transmitter or receiver, phase noise, or other impairments during transmission. When distortion increases, the ability of the receiver to distinguish between different symbols or amplitudes in the QAM signal diminishes, which results in a higher modulation error rate.

As the modulation error increases, it becomes increasingly difficult for the receiver to accurately decode the transmitted information, impacting overall signal quality and reliability. Therefore, understanding the implications of signal distortion is crucial for ensuring consistent performance in QAM systems, making it the most relevant choice in this context.

In contrast, while wider bandwidth and higher frequency can influence signal transmission characteristics, they do not directly indicate increased modulation error. Similarly, a narrower signal quality suggests improved specifications rather than indicative of modulation errors.