3,310 research outputs found
Analysis of Coverage Region for MIMO Relay Network with Multiple Cooperative DF-Relays
We study and analyze coverage region in MIMO communication systems for a
multiple-relay network with decode-and-forward (DF) strategy at the relays.
Assuming that there is a line-of-sight (LOS) propagation environment for
source-relay channels and channel state information is available at receivers
(CSIR), we consider the objective of maximizing coverage region for a given
transmission rate and show numerically the significant effect of propagation
environment on capacity bounds, optimal relay location and coverage region.
Also, we study the situation in which two adjacent relays cooperate in
transmission signals to the destination and show analytically that the coverage
region is extended compared to noncooperative scenario.Comment: Accepted for publication in International Symposium on Wireless
Communication Systems (ISWCS) 201
On the Performance of the Relay-ARQ Networks
This paper investigates the performance of relay networks in the presence of
hybrid automatic repeat request (ARQ) feedback and adaptive power allocation.
The throughput and the outage probability of different hybrid ARQ protocols are
studied for independent and spatially-correlated fading channels. The results
are obtained for the cases where there is a sum power constraint on the source
and the relay or when each of the source and the relay are power-limited
individually. With adaptive power allocation, the results demonstrate the
efficiency of relay-ARQ techniques in different conditions.Comment: Accepted for publication in IEEE Trans. Veh. Technol. 201
A Survey of Physical Layer Security Techniques for 5G Wireless Networks and Challenges Ahead
Physical layer security which safeguards data confidentiality based on the
information-theoretic approaches has received significant research interest
recently. The key idea behind physical layer security is to utilize the
intrinsic randomness of the transmission channel to guarantee the security in
physical layer. The evolution towards 5G wireless communications poses new
challenges for physical layer security research. This paper provides a latest
survey of the physical layer security research on various promising 5G
technologies, including physical layer security coding, massive multiple-input
multiple-output, millimeter wave communications, heterogeneous networks,
non-orthogonal multiple access, full duplex technology, etc. Technical
challenges which remain unresolved at the time of writing are summarized and
the future trends of physical layer security in 5G and beyond are discussed.Comment: To appear in IEEE Journal on Selected Areas in Communication
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