Main Features Of IS-95 (cdmaone)• Modulation is performed using DSSS.• Employs variable rate coders.• Powerful low rate forward error-correcting

codes.• Fast power control is employed to over come

the near-far problem.• Soft handoff is employed.• Qualcomm code excited linear predictive

(QCELP): 13.4 kbps

Frequency and Channel Spec• Reverse: 824-849MHz, forward: 869-894MHz; PCS version 1800-2000MHz• Data rate 9.6kb/s; chip rate 1.2288Mchips/s, spreading factor 128.• Power Control: Close-loop/open-loop• Rake receiver; • Soft handoff

Forward CDMA channel

Spec• Convolution code ½. Repetition circuit depending on speech• Block interleaver• Long PN sequence:

Power Control• Open Loop • Close Loop

Orthogonal Covering and modulation• Walsh function: page 574• Quadrature modulation

Uplink

Reverse Link Spec

CT2• CT2 is a cordless

telephony standard that was used in the early nineties to provide short-range proto-mobile phone service in some countries in Europe. It is considered the precursor to the

popular DECT system.

DECT• Digital Enhanced (formerly European) Cordless Telecommunications is an

ETSI standard for digital portable phones, commonly used for domestic or corporate purposes. DECT can also be used for wireless data transfers. DECT is recognised by the ITU as fullfilling the IMT-2000 requirements and thus qualifies as a 3G system, as a part of the IMT-2000

group of technologies,

DECT functional concept• Portable handset• Radio fixed part• Cordless controller• Network-specific

interface unit• Supplementary

services

DEC spec