Signal Processing for 5G: Algorithms and Implementations

Chapter 16General Principles and Basic Algorithms for Full-duplex Transmission

Thomas Kaiser and Nidal Zarifeh

1. 16.1 Introduction
2. 16.2 Self-interference: Basic Analyses and Models
3. 16.3 SIC Techniques and Algorithms
   1. 16.3.1 SIC Requirements
   2. 16.3.2 SIC Technique Categories
   3. 16.3.3 Passive Suppression in the Propagation Domain
   4. 16.3.4 Active SIC in the Analog Domain
   5. 16.3.5 Active SIC in the Digital Domain
   6. 16.3.6 Auxiliary Chain SIC
4. 16.4 Hardware Impairments and Implementation Challenges
   1. 16.4.1 Non-linear SIC
   2. 16.4.2 IQ Imbalance
   3. 16.4.3 Phase Noise
5. 16.5 Looking Toward Full-duplex MIMO Systems
   1. 16.5.1 Antenna Techniques
   2. 16.5.2 Cancellation in the Analog Domain
   3. 16.5.3 Cancellation in the Digital Domain
   4. 16.5.4 Cancellation with a Auxiliary Transmitter
6. 16.6 Conclusion and Outlook
7. References

16.1 Introduction

5G and other future wireless systems promise the user access to services that require considerably higher data rates in spite of the limited wireless spectrum. This demand for higher data rates entails achieving superior performance and efficiency in terms of wireless resources utilization. Previous generations of mobile communication mainly depended on half-duplex transmission schemes, in which the transmitted and received signals are separated either:

• in the time domain: time division duplexing (TDD), as in Figure 16.1(a)
• in the frequency domain: frequency division duplexing (FDD), as in Figure 16.1(b)
• in both: half-duplex FDD as in Figure 16.1(c).

Figure 16.1 Duplex schemes: ...