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Definition of "IS-54" |
an interim standard of the U.S.- based Telecommunications Industries Association (TIA) for a digital cellular communication system. One of a set of digital cellular systems commonly classified as second generation cellular systems. A standard originally designed to succeed the AMPS cellular standard. This interim standard has now been finalized in the standard known as IS- 136. The standard is based on the use of the same channel structure as the AMPS standard (30 kHz channels), similar frequency reuse and concept of hand-off, but with the use of a digital modulation scheme, known as π/4-shifted DQPSK, to transmit a digital signal at the rate of approximately 47 kbps on a 30 kHz channel. This signal typically carries three digital voice signals encoded at the rates of 8 kbps, excluding additional overhead bits that are used for the purpose of error correction. |
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