nasscom engineering summit 2015: session iii: road to 5g mobile wirless: prof paulraj
TRANSCRIPT
1G (AMPS)
• Voice service
• Analog FM
• Frequency Division Multiple access FDMA
• Poor spectral efficiency
• Bell Labs, Ericsson, NTT
M Cooper
J Engel R Frenkiel
2G (GSM) – Early 90s
• Digital
• Frequency Hopping
• Time Division Multiple Access TDMA
• Improved spectral efficiency
• ETSI, Ericsson, Alcatel, Matra T Haug, A Maloberti, J Ausdestad
H Lamar
3G – WCDMA
• Spread spectrum
• Code Division Multiple
access – CDMA
• Even better spectral
efficiency
• Qualcomm, NTTDoCoMo,
3GPP
I Jacobs A Viterbi
F Adachi
4G – Early 10s
• Packet switched
• Orthogonal Frequency Division Multiple access –OFDMA
• MIMO
• Fractional Reuse K=1, 3
• Adaptive Modulation
• Very good spectral efficience
• Iospan, Intel (WiMAX), 3GPPLTE A Paulraj G Foschini S Alamouti
1992 1997 1998
Mobile Technology Today
• 7.8 B Phones, 95% penetration
• 23% broadband (4G)
• Smart Phones: > 2B, Android, IOS, ..
• Infrastructure: Ericsson, Huawei, Nokia Semiconductor: Qualcomm, Mediatek, Intel
• Peak speeds - touching 150 Mbps
5G Air Interface• Performance
– Higher speed - 5-50 Gbps
– Lower latency – 1ms– Better coverage uniformity– Better economics cents/Gbyte