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IS-136 vs IS-95

This page on IS-136 vs IS-95 describes Similarities and differenece between IS-136 and IS-95 technologies.

Similarities between IS-136 and IS-95

Both are second generation cellular systems for mobile to mobile communication. Both are introduced in 19th century and uses the same spectrum 869 MHz to 894 MHz for downlink and 824 MHz to 849MHz for uplink. Downlink refers to transmission from base station to mobile station. Uplink refers to transmission from mobile station to base station.

Difference between IS-136 and IS-95

IS-136 uses TDMA multiple access, while IS-95 uses CDMA multiple access techniques.
IS-136 channel bandwidth is about 30 KHz and IS-95 channel bandwidth is about 1250 KHz.
IS-136 uses pi/4(DQPSK) and IS-95 uses QPSK modulation techniques in physical layer.
IS-136 uses speech coding technique VSELP and IS-95 uses QCELP.
IS-136 frame duration is about 40ms and IS-95 frame duration is about 20ms.
IS-136 supports 832 duplex channels and IS-95 supports 20 channels.

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RF and Wireless Terminologies

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