1 research outputs found
Full duplex-transceivers : architectures and performance analysis
PhD ThesisThe revolution of the 5G communication systems will result in 10,000 times increase
in the total mobile broadband traffic in the 2020s, which will increase the
demand on the limited wireless spectrum. This has highlighted the need for an
efficient frequency-reuse technique that can meet the ever-increasing demand on
the available frequency resources. In-band full-duplex (FD) wireless technology
that enables the transceiver nodes to transmit and receive simultaneously over the
same frequency band, has gained tremendous attention as a promising technology
to double the spectral efficiency of the traditional half-duplex (HD) systems. However,
this technology faces a formidable challenge, that is the large power difference
between the self-interference (SI) signal and the signal of interest from a remote
transceiver node. In this thesis, we focus on the architecture of the FD transceivers
and investigate their ability to approximately double the throughput and the spectral
efficiency of the conventional HD systems. Moreover, this thesis is concerned with
the design of efficient self-interference cancellation schemes that can be combined
with the architecture of the FD transceiver nodes in order to effectively suppress the
SI signal and enable the FD mode. In particular, an orthogonal frequency-division
multiplexing (OFDM) based amplify-and-forward (AF) FD physical-layer network
coding (PLNC) system is proposed. To enable the FD mode in the proposed system,
a hybrid SIC scheme that is a combination of passive SIC mechanism and
active SIC technique is exploited at each transceiver node of that system. Next, we
propose an adaptive SIC scheme, which utilizes the normalized least-mean-square
(NLMS) algorithm to effectively suppress the SI signal to the level of the noise
floor. The proposed adaptive SIC is then utilized in a denoise-and-forward (DNF)
FD-PLNC system to enable the FD mode. Finally, we introduce a novel overthe-
air SIC scheme that can effectively mitigate the SI signal before it arrives the
local analog-to-digital converter (ADC) of the FD transceiver nodes. Furthermore,
the impact of the hardware impairments on the performance of the introduced SIC
scheme is examined and characterized.Iraq, and the Ministry of
Higher Education and Scientific Research (MOHSR