| 单词 | IR |
| 释义 | IR 1. InfraRed. Infrared light is in the frequency range of 300 GHz–400 THz and has a wavelength of 1 mm–0.75 mm (750 nm). EHF radio has applications in fiber optics and free space optics (FSO) transmission systems. Infrared light is at the very lower limit of the radio spectrum, just above extremely high frequency (EHF) radio. See also EHF, electromagnetic spectrum, fiber optics, frequency, FSO, Hz, and wavelength. 2. Incremental Redundancy.Also known as Hybrid ARQ II.An enhanced automatic repeat request (ARQ) technique employed in EGPRS (Enhanced General Packet Radio System), the packet-switched mode of Enhanced Data rates for GSM Evolution (EDGE) cellular radio networks. As transmission begins, IR initially transmits packets with little forward error correction (FEC) overhead in an attempt to maximize throughput. If the initial transmission cannot be successfully decoded by the receiver, IR ratchets up the FEC overhead until it finds a level at which the receiver can successfully decode the transmission. See also ARQ, cellular radio, EDGE, EGPRS, FEC, overhead, and throughput. |
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