Chapter 22Full-duplex Radios in 5G: Fundamentals, Design and Prototyping

Jaeweon Kim, Min Soo Sim, MinKeun Chung, Dong Ku Kim and Chan-Byoung Chae

  1. 22.1 Introduction
  2. 22.2 Self-interference
  3. 22.3 Analog Self-interference Cancellation
    1. 22.3.1 Analog Passive Self-interference Cancellation: Isolation
    2. 22.3.2 Analog Active Self-interference Cancellation
  4. 22.4 Digital Self-interference Cancellation
    1. 22.4.1 Linear Components
    2. 22.4.2 Nonlinear Components
    3. 22.4.3 Auxiliary Receive Chain
  5. 22.5 Prototyping Full-duplex Radios
    1. 22.5.1 Hardware Architecture
    2. 22.5.2 Implementing Full-duplex Radio using SDR
  6. 22.6 Overall Performance Evaluation
  7. 22.7 Conclusion
  8. References

22.1 Introduction

The proliferation of smartphones, tablet PCs and laptops is continually boosting demand for higher throughput of mobile devices with advanced wireless network capabilities. Between 2014 and 2019, global mobile data traffic is expected to increase nearly tenfold – expanding at a rate of 57% each year [1]. To support such demand, fifth generation (5G) wireless communications are expected to provide 1000-fold greater throughput than 4G. The wireless spectrum used to carry this traffic, however, is physically limited. This fact could give rise to a spectrum crunch. To increase spectral efficiency, researchers have developed several promising technologies. One of them, which could potentially double spectral efficiency, is known as full duplex.

Full-duplex radios simultaneously transmit and receive in the same frequency band. ...

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