July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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18.6.2 PCS1900 (IS-136, or PCN)
The personal communications system (PCS) is based on GSM and
used time division multiplexing to provide separate channels over
each radio frequency. Convolutional coding is used at a rate of
1
2
to reduce the effects of noise and errors on the radio channel. Each
carrier is spaced 30 kHz apart and offset quadrature phase-shift keying
(OQPSK) is used to modulate the carrier.
The voice-coder (vocoder) used by PCS1900 is either full-rate
using VSELP at 7.95 kbps or enhanced full rate (EFR) that uses
ACELP at 7.4 kbps. The EFR scheme was developed for use in
PCS1900 and has since been adopted by both GSM900 and GSM1800
networks ...
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