Question: For a UTRA FDD User Equipment (UE) supporting Enhanced Dedicated Channel (E-DCH) with 2ms Transmission Time Interval (TTI) and High-Speed Downlink Packet Access (HSDPA), what determines the receive characteristics of the E-DCH HARQ ACK Indicator Channel (E-HICH) in various multi-path fading environments?
Option 1: Signal-to-Noise Ratio (SNR) and Interference Over Thermal Noise (IoT)
Option 2: Missed ACK and False ACK values
Option 3: Transmission Power Control (TPC) commands and Channel Quality Indicator (CQI) reports
Option 4: Modulation Scheme and Coding Rate of the E-HICH
Explanation: The receive characteristics of the E-DCH HARQ ACK Indicator Channel (E-HICH), particularly in diverse multi-path fading environments, are directly influenced by the reliability and accuracy of the acknowledgement feedback. This is precisely what Missed ACK (indicating a failure to acknowledge correctly) and False ACK (incorrectly acknowledging) values provide - a measure of the channel's performance under such conditions, thereby determining its receive characteristics for effective Hybrid Automatic Repeat Request (HARQ) operation in E-DCH with HSDPA.