Topic: Digital Communications
Which performance metric is minimized in the Minimum Mean Square Error (MMSE) equalizer?
- A. Bit error rate
- B. Mean squared error between transmitted and received signals
- C. Inter-symbol interference
- D. Noise power
Answer: B. Mean squared error between transmitted and received signals
Explanation: An MMSE equalizer is designed to minimize the expected mean squared error between the actual transmitted symbol and the equalizer's output estimate (derived from the received signal). It provides a balance between removing Inter-Symbol Interference (ISI) and preventing excessive noise enhancement.