4.Cellular Systems:Multiple Access and EECS Interference Management Wireless F oundations Some History Cellular concept (Bell Labs,early 70's) AMPS (analog,early 80's) GSM(digital,narrowband,late 80's) IS-95(digital,wideband,early 90's) ·3G/4 G systems Fundamentals of Wireless Communication,Tse&Viswanath 3 4. Cellular Systems: Multiple Access and Interference Management Fundamentals of Wireless Communication, Tse&Viswanath 3 Some History • Cellular concept (Bell Labs, early 70’s) • AMPS (analog, early 80’s) • GSM (digital, narrowband, late 80’s) • IS-95 (digital, wideband, early 90’s) • 3G/4G systems