IS-95

Frequencies 815 MHz,894 MHz,1850 MHz,1995 MHz,880 MHz,960 MHz,1710 MHz,1880 MHz Frequency Range 815 MHz - 1995 MHz Mode RAW Modulation DSSS,QPSK ACF — Emission Designator — Bandwidth 1.228 MHz Location Worldwide Short Description CDMA-One also known as IS-95, was the first ever cellular standard technology based on Code Division Multiple Access (CDMA). It is a predecessor of the 1xRTT (CDMA2000/IS-2000) standard, which is backwards compatible. I/Q Raw Recording — Audio Sample IS-95 , commonly known by the brand name cdmaOne , is a 2G[[1]]( digital cellular technology. Published in 1995 by a collaboration between Qualcomm, Motorola, and AT&T (later Lucent), IS-95 was the first major cellular technology to use spread-spectrum techniques to increase spectrum efficiency, user density, and signal robustness. IS-95 uses direct-sequence spread spectrum (DSSS) to expand a 1.2-9.6 kbpsKilobits per second (kbps) or 14.4 kbpsKilobits per second (kbps) signal to a large bandwidth, and uses correlation to identify a station's signal via its assigned code and recover traffic, thus creating code-division multiple access (CDMACode Division Multiple Access). CDMACode Division Multiple Access allows cells to share frequencies, allowing for denser system construction than what was possible with AMPS[[2]]( . cdmaOne competed against GSM with GPRS, an equivalent 2G technology[[1]]( . IS-95 exists as two largely compatible versions: the initially published IS-95A, and the later IS-95B that the name cdmaOne refers to. IS-95A provided a data rate of 14.4 kbpsKilobits per second (kbps), while IS-95B allowed aggregation of eight CDMACode Division Multiple Access channels to provide a 115.2 kbpsKilobits per second (kbps) data rate. As the physical layer of IS-95A and IS-95B are identical, infrastructure was not changed to upgrade IS-95A base stations to IS-95B[[3]]( . IS-95B additionally supports the 1900 MHzMegaHertz (MHz) 10^6 Hz PCS band, while IS-95A was specified only for the 800 MHzMegaHertz (MHz) 10^6 Hz cellular band[[4]]( . Sample for forward link (narrow bandwidth) recorded by MC4f using an Agilent 8960 base station. Edit&action=edit "You can edit this page. Please use the preview button before saving [e]")