Contributions for 5G Development at Brazil May 22 nd 2018 Dr. Henry - - PowerPoint PPT Presentation

Contributions for 5G Development at Brazil

• Dr. Henry Douglas Rodrigues

May 22nd 2018

Agenda

• Motivations for 5G
• Inatel Contributions for 5G
• Demos and Performance
• Future Work
• Conclusions

Motivations

Motivations – 5G Scenarios massive Machine‐Type Communication (mMTC) Ultra‐Reliable Low‐Latency (URLL)

Motivations – 5G Scenarios

Peak Rate > 20 Gbps Latency < 1ms Connections per cell > 100k Coverage radius >= 50 km

mMTC URLL Internet Access for Remote Areas (IARA)

Motivations – Remote Areas Applications

Huge social impacts:

• 3.9 billion people are unconnected

Smart farms:

• Farms automation
• Machinery control
• Environment and cattle monitoring

Road coverage:

• Entertainment
• Vehicle‐to‐infrastructure (V2I)

Inatel Contributions for 5G

Inatel Contributions for 5G

• Centro de Referência em Radiocomunicações ( )
• Flexible reference model: 5G transceiver
• Comply with specific requirements for Remote Area scenario
• Produce knowledge
• Training for professionals

5G Flexible Transceiver

• New Waveform:
• Low out‐of‐band emissions
• Flexible to cover different scenarios
• Main Technologies:
• Polar coding
• 2x2 MIMO for diversity
• Hardware:
• 100% real‐time operation
• FDD (Frequency Division Duplexing)
• Scalable bandwidth

Software Defined Radio

OFDM CP

CP protects the data from the channel

OFDM CP OFDM CP CP wastes energy and throughput!

What if we can have a modulation scheme that needs

• nly one CP for several subsymbols?

What if we can have a modulation scheme that needs

• nly one CP for several subsymbols?

Subsymbol Subsymbol Subsymbol CP

Resource saved by efficient use of the CP

CP waste of energy and bandwidth can be significantly reduced. CP waste of energy and bandwidth can be significantly reduced. Motivations for new waveforms

• Problem: Energy and Spectral Efficiency

Huge energy Leakage …

Primary User

… because of the smooth pulses.

• Proble: High energy leakage (Cognitive Radio)

… caused by bad filter shape.

Very strong interference

What if we can have a modulation scheme that has a smooth pulse shape with virtually zero energy leakage? What if we can have a modulation scheme that has a smooth pulse shape with virtually zero energy leakage?

No interference

time frequency

Primary User

The ability to control the pulse‐shape allows the co‐existence with other technologies. The ability to control the pulse‐shape allows the co‐existence with other technologies.

Zero energy leakage…

Motivations for new waveforms

5G GFDM Transceiver Block Diagram

Rate Adaption Rate Adaption Channel encoder Channel encoder GFDM Demodulator GFDM Demodulator Channel Decoder Channel Decoder GFDM Modulador GFDM Modulador Synchronization Signal Synchronization Signal

FPGA (USRP Rio) Host (Windows PC) Software Defined Radio External Hardware

Channel Estimation Signal Channel Estimation Signal Stuffing Removal Stuffing Removal Ethernet Interface Ethernet Interface BER Meas. BER Meas. Packet De‐ tunneling Packet De‐ tunneling Channel Estimation Signal Channel Estimation Signal Packet Tunneling Packet Tunneling Ethernet Interface Ethernet Interface PRBS data PRBS data Frame Structure Frame Structure TR‐STC Encoder TR‐STC Encoder CP/CS windowing CP/CS windowing Channel Estimation Channel Estimation Time & Carrier Offset Synch. Time & Carrier Offset Synch. ST Decoder Equalization ST Decoder Equalization Impairments Auto‐correction Impairments Auto‐correction Automatic Gain Control Automatic Gain Control RX Front‐end RX Front‐end Synchronization Signal Synchronization Signal

Transmitter Receiver

Digital Pre‐ Distortion Digital Pre‐ Distortion RX Front‐end RX Front‐end PA PA TX Front‐end TX Front‐end

5G Transceiver System – Base Station

Coexistence with Digital TV in UHF band

ISDB‐T

OFDM

GFDM

frequency

Coexistence with Digital TV in UHF band

Demos and Performance

Inatel Campus – March 2017

Inatel Campus @ Santa Rita do Sapucaí, Minas Gerais, Brazil

International Award – June 2017

Grand Challenge

@ Oulu, Finland

Brasília – August 2017

5G Base Station 5G Mobile Station

Demo @ Brasília – August 2017

Preliminary Field Tests – June 2018

Under evaluation:

• Coverage
• Throughput
• Robustness (MIMO and Polar

Coding)

• Channel model
• Legacy compatibility

(interference)

Performance Analysis @ Lab

• Goal: how much do we

lose, due to implementation?

• AWGN Channel
• 64QAM, Polar 3/4

Noisy channel estimation Implementation loss

Future Work

Evolution Roadmap

5G Transceiver Definition of PHY and MAC technologies Coordinated Multipoint Definition of PHY and MAC technologies Solutions for Irradiating Systems Definition of 5G Network Architecture Massive MIMO Control and Resource Allocation Prototypes for each scenario 5G Network 5G Network

Today Future

Conclusions

Conclusions

• Huge demand for providing connectivity for rural areas
• 5G Networks can be the final solution for delivering Internet access

everywhere

• Current technology can create new business model and economic feasible

solutions for remote are coverage