This ETSI TETRA codec.It enable intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include: -

Karhunen Loeve Least Mean Square Algorithm for mobile communications 3G

无线通讯从2G、3G到3.9G发展过程，是从移动的语音业务到高速业务发展的过程-Wireless communications from the 2G, 3G to 3.9G development process, from mobile voice services to the process of rapid business development