DSP for Next Generation Wireless Systems Chance Tarver Joseph - - PowerPoint PPT Presentation

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DSP for Next Generation Wireless Systems Chance Tarver Joseph - - PowerPoint PPT Presentation

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DSP for Next Generation Wireless Systems Chance Tarver Joseph Cavallaro April 26, 2018 Where were going: Massive device to device connectivity: Sensor Networks Internet-of-Things Body Area Networks Mobile Broadband

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SLIDE 1

DSP for Next Generation Wireless Systems

Chance Tarver Joseph Cavallaro

April 26, 2018

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SLIDE 2

Where we’re going:

  • Massive device to

device connectivity:

  • Sensor Networks
  • Internet-of-Things
  • Body Area Networks
  • Mobile Broadband
  • ver 100 Gpbs
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SLIDE 3
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SLIDE 4
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SLIDE 5

Challenges Future Directions

  • Densification
  • Increased spectrum

congestion

  • New ultrawideband

waveforms stressing the physical layer

  • New spectrum resources in

mmWave and beyond

  • Massive MIMO
  • Coexistence aware waveforms

assisted by predistortion

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SLIDE 6

Our Unique Approach

DSP / Algorithm Architecture Testbed

Co-design

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SLIDE 7

Massive Multi-User MIMO Systems

Hundreds of base station antennas

Simultaneously transmitting to tens of users on the same frequency

Record breaking spectral efficiency

MIMO Base Station Downlink Uplink

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SLIDE 8

I/O Bottlenecks

equalizer

. . .

RF RF RF RF RF RF

channel estimation

. . .

decoder equalizer decoder

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SLIDE 9

Decentralized Baseband Processing

Split the base station antennas into clusters with fewer antennas.

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SLIDE 10

Decentralized Baseband Processing

  • Alleviates interconnection

and computation bottlenecks

  • Realizes efficient, modular

and scalable baseband processing

  • Achieves competitive (or

equal) performance to centralized methods

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SLIDE 11

Reconfigurable Eco-system for Next- generation End-to-end Wireless

  • Develop world’s first fully

programmable and observable wireless radio network.

  • Wireless research and development

community will be able to test diverse ideas and concepts.

  • PAWR. More than 28 private-sector

companies from US wireless industry

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SLIDE 12
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SLIDE 13

Predistortion for Power Amplifiers

Power Amp

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SLIDE 14

Predistortion for Power Amplifiers

Power Amp

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SLIDE 15

Predistortion for Power Amplifiers

Power Amp

x(t) ⋅ G → y(t)

?

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SLIDE 16

PA Input Power PA Output Power

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SLIDE 17

PA Input Power PA Output Power

PA Saturates

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SLIDE 18
  • 60
  • 40
  • 20

20 40 60

Frequency (MHz)

  • 60
  • 50
  • 40
  • 30
  • 20
  • 10

PSD

Original TX signal No DPD

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SLIDE 19

Power Amp

Digital Predistortion (DPD)

DPD Learning DPD Application

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SLIDE 20

Power Amp

Digital Predistortion (DPD)

DPD Learning DPD Application

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SLIDE 21
  • 60
  • 40
  • 20

20 40 60

Frequency (MHz)

  • 60
  • 50
  • 40
  • 30
  • 20
  • 10

PSD

Original TX signal No DPD With DPD

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SLIDE 22

Testbed

Conclusions

  • Enabling massive device

driven connectivity

  • Codesign between

algorithms and architectures is necessary to meet challenges in next generation wireless systems

DSP / Algorithm Architecture

Christoph Studer Cornell University Kaipeng Li Rice University Joseph Cavallaro Rice University

Acknowledgments: