If a noisy channel introduces significant intersymbol interference across several adjacent symbols in a quadrature amplitude modulation (QAM) system's spectrum, which consequence follows?

💡 Explanation

Difficult symbol detection and equalization occur because intersymbol interference spreads the energy of each symbol across time and frequency, overlapping with neighboring symbols and distorting the received signal. Adaptive equalization aims to compensate for this, therefore decoding becomes difficult, rather than improving signal integrity or resistance to interference.

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