The challenge of in‐band full‐duplex (IBFD) transceivers is to simultaneously transmit and receive at the same frequency band. To be able to listen and decode a low‐power received signal while transmitting
a high‐power signal, it is necessary to mitigate the self‐interference (SI) signal caused by leakages between the transmitter (Tx) and the receiver (Rx). To avoid placing the computational load of SI cancelation (SIC) on the user equipment (UE), IBFD is considered here only at the BS. The scenario considered is a frequency division duplex (FDD) or time division duplex (TDD) system, where a UE1 transmits to the BS on a certain frequency, while the BS simultaneously transmits to a UE2 on the same frequency. UE1 and UE2 are chosen to be spatially separated to avoid UE1 to interfere towards UE2. Moreover, a small cell scenario is considered, where there is a smaller difference between transmit and receive power than in large cell scenarios, thus requiring less isolation between transmitter and receiver, and therefore less SIC capability. Such transmission schemes can bring an important capacity gain compared to standard TDD [11] or FDD.
The Reference :
5G System Design
Architectural and Functional Considerations and Long Term Research
