| 单词 | SDR (Software-Defined Radio) |
| 释义 | SDR (Software-Defined Radio) A developing type of radio equipment that can be reprogrammed quickly to transmit and receive on any frequency within a wide range of frequencies, and using virtually any transmission format and any set of standards.Theoretically, a device such as a wireless LAN (WLAN) network interface card (NIC) or cellular telephone with an SDR chipset could seek out frequency bands and native protocols supported by available networks, lock in on the signals, and negotiate access to the desired network, downloading any necessary supplemental software required to effect network compatibility. In the process, SDR-equipped devices would resolve any conflicts between networks sharing a given band (e.g., 802.11b/g and Bluetooth overlap in the 2.4 GHz ISM band). SDR originated in the early 1990s in the U.S. military SpeakEasy program. The U.S. Federal Communications Commission (FCC) began hearings on SDR in March 2000, with the intent that the development of SDR could promote more efficient use of spectrum, expand access to broadband wireless communications, and increase competition among service providers. Military equipment manufacturers have products they tout as being SDR, although they do not conform to open standards. Manufacturers of radio equipment for emergency response agencies are working to develop SDR products that can bridge multiple emergency radio protocols so that fire and police department system, for example, can intercommunicate during an emergency. See also 802.11b, 802.11g, Bluetooth, broadband, cellular, FCC, NIC, radio, and WLAN. |
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