Overview of Mobile Radio Systems in North America

mobile communication
radio system
frequency band
modulation
multiple access

This page provides an overview of various mobile radio systems used in North America, including AMPS, NAMPS, USDC, CDPD, IS-95, GSC, POCSAG, FLEX, DCS-1900 (GSM), PACS, MIRS, and iDEN.

Mobile Radio System Overview

The following table summarizes the key characteristics of these systems:

TYPEYEARMULTIPLE ACCESSFREQUENCY BANDMODULATIONBW
AMPS1983FDMA824-894 MHzFM30 kHz
NAMPS1992FDMA824-894 MHzFM10 kHz
USDC1991TDMA824-894 MHzPi/4 DQPSK30 kHz
CDPD1993FH/ Packet824-894 MHzGMSK30 KHz
IS-951993CDMA824-894 MHz/ 1.8-2.0 GHzQPSK /BPSK1.25 MHz
GSC1970sSimplexManyFSK12.5 KHz
POCSAG1970sSimplexManyFSK12.5 KHz
FLEX1993SimplexMany4-FSK15 KHz
DCS-1900 (GSM)1994TDMA1.85-1.99 GHzGMSK200 KHz
PACS1994TDMA/ FDMA1.85 -1.99 GHzPi/4 DQPSK300 KHz
MIRS1994TDMAMany16QAM25 KHz
iDen1995TDMAMany16QAM25 KHz

Explanation of Terms:

  • TYPE: The name of the mobile radio system. This could be a cellular standard, a paging system, or a specialized mobile radio (SMR) system.
  • YEAR: The year the system was introduced or became commercially available.
  • MULTIPLE ACCESS: The method used to allow multiple users to share the same frequency band (FDMA, TDMA, CDMA).
  • FREQUENCY BAND: The range of radio frequencies used by the system.
  • MODULATION: The type of modulation used to encode information onto the radio signal (FM, GMSK, QPSK, etc.).
  • BW: The bandwidth or channel width occupied by a single communication channel.
OFDM vs. OFDMA: A Detailed Comparison

OFDM vs. OFDMA: A Detailed Comparison

Explore the differences between OFDM and OFDMA modulation schemes, focusing on multiple access, resource allocation, and suitability for various wireless communication systems.

ofdm
ofdma
modulation
GSM Physical Layer (Layer-1) Explained

GSM Physical Layer (Layer-1) Explained

Explore the GSM physical layer (layer-1) functions, including baseband processing, FEC, ciphering, burst formation, and modulation for mobile station transmission.

gsm
physical layer
modulation