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PDC (PERSONAL
DIGITAL CELLULAR)
Personal Digital Cellular (PDC) is a 2G mobile
phone standard developed and used exclusively in
Japan.
Like D-AMPS and GSM, PDC uses TDMA. The standard
was defined by the RCR (later became ARIB) in
April 1991, and NTT DoCoMo launched its Digital
MOVA service in March 1993. PDC uses 25 kHz
carrier, 3 time slots, pi/4-DQPSK modulation and
low bit-rate 11.2 kb/s and 5.6 kb/s (half-rate)
voice codecs.
PDC is implemented the in 800 MHz (downlink
810-888 MHz, uplink 893-958 MHz), and 1.5 GHz
(downlink 1477-1501 MHz, uplink 1429-1453 MHz)
bands. The air interface is defined in RCR
STD-27 and the core network MAP by JJ-70.10. NEC
and Ericsson are the major network equipment
manufacturers.
The services include voice (full and half-rate),
supplementary services (call waiting, voice
mail, three-way calling, call forwarding, and so
on), data service (up to 9.6 kb/s CSD), and
packet-switched wireless data (up to 28.8 kb/s
PDC-P).
Compared to GSM, PDC's weak broadcast strength
allows small, portable phones with light
batteries at the expense of substandard voice
quality and problems maintaining the connection,
particularly in enclosed spaces like elevators.
PDC has 61.817 million subscribers as of end
December 2003 but is slowly being phased out in
favor of 3G technologies like W-CDMA and
cdma2000.
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