In this paper, we propose a two-way relaying scheme using non-orthogonal multiple access (NOMA) technology. In this scheme, two sources transmit packets with each other under the assistance of the decode-and-forward (...
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In this paper, we propose a two-way relaying scheme using non-orthogonal multiple access (NOMA) technology. In this scheme, two sources transmit packets with each other under the assistance of the decode-and-forward (DF) relays, called as a TWDFNOMA protocol. The cooperative relays exploit successive interference cancellation (SIC) technique to decode sequentially the data packets from received summation signals, and then use the digital network coding (DNC) technique to encrypt received data from two sources. A max-min criterion of end-to-end signal-to-interference-plus-noise ratios (SINRs) is used to select a best relay in the proposed TWDFNOMA protocol. Outage probabilities are analyzed to achieve exact closed-form expressions and then, the system performance of the proposed TWDFNOMA protocol is evaluated by these probabilities. Simulation and analysis results discover that the system performance of the proposed TWDFNOMA protocol is improved when compared with a conventional three-timeslot two-way relaying scheme using DNC (denoted as a TWDNC protocol), a four-timeslot two-way relaying scheme without using DNC (denoted as a TWNDNC protocol) and a two-timeslot two-way relaying scheme with amplify-and-forward operations (denoted as a TWANC protocol). Particularly, the proposed TWDFNOMA protocol achieves best performances at two optimal locations of the best relay whereas the midpoint one is the optimal location of the TWDNC and TWNDNC protocols. Finally, the probability analyses are justified by executing Monte Carlo simulations.
In this paper, we consider digitalnetwork Coded Cooperation (DNCC) with Decode-and-Forward (DF) relaying scheme in correlated environment. In order to quantify the performance of DNCC network, analytical closed form ...
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In this paper, we consider digitalnetwork Coded Cooperation (DNCC) with Decode-and-Forward (DF) relaying scheme in correlated environment. In order to quantify the performance of DNCC network, analytical closed form expression of the outage probability for Non-Line of Sight (NLoS) correlated environments is derived. For the sake of completeness and comparison, investigation of uncorrelated environments is also presented. Unlike existing investigations, it is observed that spatial correlation among channels considerably improves the performance of such networks. In particular, detrimental effects of the digital network coding (DNC) noise is abated by the channel correlation. Additionally a discussion on various deterministic geometries for such networks is also presented to get further insights about node placement. Cumulative Distribution Function (CDF) obtained for Signal to Noise Ratio (SNR) of relay path can be utilized for performing diversity calculations. Outage closed form expressions derived may be used to choose network parameters judiciously in different NLoS correlated scenarios for achieving better Quality of Service (QoS) in next generation wireless networks. (C) 2021 Elsevier B.V. All rights reserved.
This paper discusses different modulation schemes for the decoding of signals in Analog networkcoding (ANC). Analog networkcoding is a concept in which interference of the signals is considered as advantage rather t...
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ISBN:
(纸本)9781467331487
This paper discusses different modulation schemes for the decoding of signals in Analog networkcoding (ANC). Analog networkcoding is a concept in which interference of the signals is considered as advantage rather than disadvantage. Router interferes the signal transmitted from two nodes that want communication between them. At the receiving end the node subtracts its own signal to decode the signal transmitted by the sender. Signal decoding at the receiving end is not a simple problem. Signal has to traverse through the channel to reach the receiver. Channel imparts many distortions in the signal in the form of magnitude and phase. Retrieval of the correct information of the signal in terms of its amplitude and phase is very important. The decoding of the signal at the receiving end depends upon number of factors and one of them is the modulation scheme used. In this paper we use different modulation schemes such as ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying) and MSK (Minimum Shift Keying). We discuss how these modulation schemes affect the analog networkcoding process. Models are proposed for the retrieval of the signals. Simulations are performed to prove the results. Matlab/Simulink is used as a tool for simulations.
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