108 research outputs found
Transmission Capacity of Full-Duplex MIMO Ad-Hoc Network with Limited Self-Interference Cancellation
In this paper, we propose a joint transceiver beamforming design to
simultaneously mitigate self-interference (SI) and partial inter-node
interference for full-duplex multiple-input and multiple-output ad-hoc network,
and then derive the transmission capacity upper bound (TC-UB) for the
corresponding network. Condition on a specified transceiver antenna's
configuration, we allow the SI effect to be cancelled at transmitter side, and
offer an additional degree-of-freedom at receiver side for more inter-node
interference cancellation. In addition, due to the proposed beamforming design
and imperfect SI channel estimation, the conventional method to obtain the
TC-UB is not applicable. This motivates us to exploit the dominating interferer
region plus Newton-Raphson method to iteratively formulate the TC-UB. The
results show that the derived TC-UB is quite close to the actual one especially
when the number of receive-antenna is small. Moreover, our proposed beamforming
design outperforms the existing beamforming strategies, and FD mode works
better than HD mode in low signal-to-noise ratio region.Comment: 7 pages, 4 figures, accepted by Globecom 201
Multi-Antenna Assisted Virtual Full-Duplex Relaying with Reliability-Aware Iterative Decoding
In this paper, a multi-antenna assisted virtual full-duplex (FD) relaying
with reliability-aware iterative decoding at destination node is proposed to
improve system spectral efficiency and reliability. This scheme enables two
half-duplex relay nodes, mimicked as FD relaying, to alternatively serve as
transmitter and receiver to relay their decoded data signals regardless the
decoding errors, meanwhile, cancel the inter-relay interference with
QR-decomposition. Then, by deploying the reliability-aware iterative
detection/decoding process, destination node can efficiently mitigate
inter-frame interference and error propagation effect at the same time.
Simulation results show that, without extra cost of time delay and signalling
overhead, our proposed scheme outperforms the conventional selective
decode-and-forward (S-DF) relaying schemes, such as cyclic redundancy check
based S-DF relaying and threshold based S-DF relaying, by up to 8 dB in terms
of bit-error-rate.Comment: 6 pages, 4 figures, conference paper has been submitte
Cooperative Full-Duplex Physical and MAC Layer Design in Asynchronous Cognitive Networks
In asynchronous cognitive networks (CNs), where there is no synchronization between primary users (PUs) and secondary users (SUs), spectrum sensing becomes a challenging task. By combining cooperative spectrum sensing and full-duplex (FD) communications in asynchronous CNs, this paper demonstrates improvements in terms of the average throughput of both PUs and SUs for particular transmission schemes. The average throughputs are derived for SUs and PUs under different FD schemes, levels of residual self-interference, and number of cooperative SUs. In particular, we consider two types of FD schemes, namely, FD transmit-sense-reception (FDr) and FD transmit-sense (FDs). FDr allows SUs to transmit and receive data simultaneously, whereas, in FDs, the SUs continuously sense the channel during the transmission time. This paper shows the respective trade-offs and obtains the optimal scheme based on cooperative FD spectrum sensing. In addition, SUs’ average throughput is analyzed under different primary channel utilization and multichannel sensing schemes. Finally, new FD MAC protocol design is proposed and analyzed for FD cooperative spectrum sensing. We found optimum parameters for our proposed MAC protocol to achieve higher average throughput in certain applications
Energy Efficient Resource Allocation for Mobile-Edge Computation Networks with NOMA
This paper investigates an uplink non-orthogonal multiple access (NOMA)-based
mobile-edge computing (MEC) network. Our objective is to minimize the total
energy consumption of all users including transmission energy and local
computation energy subject to computation latency and cloud computation
capacity constraints. We first prove that the total energy minimization problem
is a convex problem, and it is optimal to transmit with maximal time. Then, we
accordingly proposed an iterative algorithm with low complexity, where
closed-form solutions are obtained in each step. The proposed algorithm is
successfully shown to be globally optimal. Numerical results show that the
proposed algorithm achieves better performance than the conventional methods.Comment: 7 pages 5 figures. arXiv admin note: text overlap with
arXiv:1807.1184
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