The Pdc Standard - Agilent Technologies ESA-E Series User And Programming Manual

Understanding Modulation Analysis
Digital Communication Systems Standards Overview
GSM) system operating in the 900 MHz band, which includes P-GSM, E-GSM,
and R-GSM. Primary, or standard, GSM 900 band (P-GSM) is the original GSM
band. Extended GSM 900 band (E-GSM) includes all the P-GSM band plus an
additional 50 channels. Railway GSM 900 band (R-GSM) includes all the E-GSM
band plus additional channels. DCS 1800 is an adaptation of GSM 900, created to
allow for smaller cell sizes for higher system capacity. PCS 1900 is intended to be
identical to DCS 1800 except for frequency allocation and power levels. The term
GSM 1800 is sometimes used for DCS 1800, and the term GSM 1900 is
sometimes used for PCS 1900.
The GSM digital communications standard employs an 8:1 Time Division
Multiple Access (TDMA) allowing eight channels to use one carrier frequency
simultaneously. The 270.833 kbits/second raw bit rate is modulated on the RF
carrier using Gaussian Minimum Shift Keying (GMSK).The standard includes
multiple traffic channels (TCH), a control channel (CCH), and a broadcast control
channel (BCCH). The GSM specification defines a channel spacing of 200 kHz.
EDGE employs the same symbol rate and frame structure as GSM. EDGE and
GSM signals can be transmitted on the same frequency, occupying different
timeslots, and both use existing GSM equipment. Due to the similarity between the
formats, the transmitter measurements are the same, with the addition of only a
few EDGE-specific measurements. One of them is:
EDGE EVM It provides a measure of modulation accuracy. EDGE 8PSK
modulation pattern uses a rotation of 3p/8 radians to avoid zero
crossing, thus affording some margin of linearity relief for
amplifier performance. It is substantially more demanding than
GSM modulation (GMSK), and EDGE EVM testing is
necessary to reveal performance shortcomings.
The EDGE format is defined in the following standards documents:
GSM 05.04, 05.05, 11.10, 11.21, and ANSI J-STD-007 specifications. These
documents define complex, multi-part measurements used to maintain an
interference-free environment. For example, the documents include measuring the
power of a carrier.

The PDC Standard

Personal Digital Cellular (PDC) is one of the cellular communications systems
in Japan. The digital modulation format used in the PDC system is the pi/4
differential quadrature phase shift keying (pi/4 DQPSK). The pi/4 DQPSK
modulation causes both phase and amplitude variations on the RF signal. The
quadrature nature of this modulation allows 2 bits to be transmitted at the same
time on orthogonal carriers. These 2 bits make one PDC symbol.The PDC
communications system is defined in the Association of Radio Industries
and Business (ARIB) document, RCR STD-27, Personal Digital Cellular
Telecommunication System Standard.
10 Chapter 2