This paper presents the design and performance analysis of an analog network coding (ANC) scheme for multi-user multi-carrier differential chaos shift keying (MC-DCSK) modulation. The incentives to employ the MC-DCSK ...
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This paper presents the design and performance analysis of an analog network coding (ANC) scheme for multi-user multi-carrier differential chaos shift keying (MC-DCSK) modulation. The incentives to employ the MC-DCSK system are to achieve a better spectral efficiency and more efficient energy consumption compared to that of a conventional DCSK system. The proposed scheme considers a network comprising L user nodes (L >= 2) and a single relay node R. In this scheme, called the ANC-based two-way relay system, all users transmit their signals to the relay in the first time slot, and the relay forwards the superposition of the received signals each of the user nodes in the second time slot. At the receiver end, each user mitigates the overall interference by subtracting its own data signal from the received combined signal and then starts the decoding process. The system design is analytically studied, and the corresponding theoretical bit error rate expression for the multipath fading channel is derived. Additionally, the conventional ANC-DCSK scheme is analyzed and compared to the proposed ANC-based MC-DCSK scheme to show the improvement in the performance of our approach. Finally, to validate the accuracy of the methodology, the simulation results are compared to the related theoretical expressions.
In this paper, we consider analog network coding (ANC) in the Multiple Access Relay Channel (MARC) with multiple relays, and provide the following three-fold contribution: 1) we introduce a tractable mathematical fram...
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In this paper, we consider analog network coding (ANC) in the Multiple Access Relay Channel (MARC) with multiple relays, and provide the following three-fold contribution: 1) we introduce a tractable mathematical framework for computing the Symbol Error Rate (SER) of Maximum-Likelihood (ML), Zero-Forcing (ZF), and Minimum Mean Square Error (MMSE) receivers;2) by capitalizing on this tractable mathematical framework, we formulate a power allocation problem that is proved to be convex for ML, ZF and MMSE receivers;and 3) we provide closed-form expressions of the optimal power to be allocated to the sources and the relays for ZF and MMSE receivers. With the aid of Monte Carlo simulations, we validate the accuracy of the proposed mathematical framework for various network topologies and channel conditions, as well as study the effectiveness of optimal power allocation. It is shown, in particular, that power optimization is beneficial as the number of sources increases and if the quality of the source-relay links is better than the quality of the relay-destination links.
We propose ANC-CDMA, a CDMA-based analog network coding scheme for underwater acoustic sensor networks (UW-ASNs) that can significantly improve the underwater acoustic channel utilization. First, we analyze a unidirec...
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We propose ANC-CDMA, a CDMA-based analog network coding scheme for underwater acoustic sensor networks (UW-ASNs) that can significantly improve the underwater acoustic channel utilization. First, we analyze a unidirectional multihop network, in which two acoustic nodes separated by two hops are assigned the same code-division channel (i.e., spreading code) to transmit concurrently. The packets transmitted by the two nodes will collide at the intermediate (relay) node. However, we show that, by exploiting a priori information, i.e., the interfered packet previously received from one of the nodes, and applying joint channel estimation through pilot supervision along with a newly designed adaptive RAKE receiver, the relay node can cancel the interference before decoding the packet of interest. We then extend our analysis to a bidirectional network, in which two nodes first concurrently transmit their packets to the relay using the same spreading code. The relay amplifies and forwards the received interfered packet to the two nodes. We show that either node can still decode the packet of interest after equalizing the channel effects introduced during the propagation from the relay to itself and jointly estimating multipath affected channels and suppressing the self-interference signal before applying the adaptive RAKE receiver. The proposed ANC-CDMA scheme is implemented in a testbed based on Teledyne Benthos Telesonar SM-975 underwater modems and tested extensively in Lake LaSalle. Experiments and simulations demonstrate that for a 1-2 dB tradeoff in signal-to-noise ratio (SNR), the proposed scheme can significantly improve the channel utilization of a unidirectional and bidirectional networks by up to 50% and 100%, respectively, compared with conventional multiuser DS-CDMA scheme.
In this paper, we focus on studying the optimal joint relay positioning and power allocation for two serial relays' transmission. We consider that information exchanges in Rayleigh flat-fading channels between two...
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In this paper, we focus on studying the optimal joint relay positioning and power allocation for two serial relays' transmission. We consider that information exchanges in Rayleigh flat-fading channels between two end-users which have symmetric traffic requirements in terms of the data rate. Multiple serial half-duplex relay nodes are employed to extend the communication coverage and assist the bidirectional communication between two end-users using the analog network coding protocol. With the objective of minimizing the total transmitting energy at the required data rate c, we investigate the optimal relay positioning and power allocation and then propose sub-optimal solutions for a two-serial-relay one-way channel and a two-serial-relay two-way channel due to no close-form optimal solution. Simulation results demonstrate a consistency with our proposed schemes.
In underwater acoustic networks, the objective that researchers are pursuing is establishing a network with high reliability, high throughput and low energy consumption. networkcoding can enhance reliability and thro...
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ISBN:
(纸本)9780933957435
In underwater acoustic networks, the objective that researchers are pursuing is establishing a network with high reliability, high throughput and low energy consumption. networkcoding can enhance reliability and throughput of network. Moreover, the throughput of network will be significantly improved by analog network coding. Accordingly, with higher reliability and higher throughput, the energy consumption will be lower. In this paper, the linear networkcoding and analog network coding are combined creatively. Besides, a SNR estimation algorithm is used to choose packets instead of choosing packets randomly for decoding. Afterwards, for taking advantage of the redundant packets better, packets are refreshed via bit-by-bit comparison. At last, we present nmuerical experiments to evaluate the performance of this scheme.
analog network coding has been successfully employed in conventional two way relaying systems. However, analog two way relaying is successful when the two sender and destination nodes are symmetric. In practical cellu...
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ISBN:
(纸本)9781467371940
analog network coding has been successfully employed in conventional two way relaying systems. However, analog two way relaying is successful when the two sender and destination nodes are symmetric. In practical cellular-based mobile communication systems of the likes of Long Term Evolution (LTE), the system is composed of several powerful base-stations and low power users' equipment. Applying classical two way relaying will cause unbearable interference. In this paper we propose applying networkcoding between two user equipment in the same cell in the uplink direction. We investigate Single Input Single Output (SISO) and Multiple Input Multiple Output (MIMO) models for this scenario. We also study the effect of interference of other nodes in surrounding cells.
In this paper, we propose to improve a Cooperative Automatic Repeat reQuest (C-ARQ) scheme through the optimization of the distribution of the average relay energy cost in a two sources one destination wireless system...
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ISBN:
(纸本)9780992862633
In this paper, we propose to improve a Cooperative Automatic Repeat reQuest (C-ARQ) scheme through the optimization of the distribution of the average relay energy cost in a two sources one destination wireless system. We consider a BPSK modulated transmission over Rayleigh fading channels. We propose to use specific relay and destination treatment for different possible cases: both received packets are error free, only one received packet is detected erroneous or both received packets are detected erroneous at the destination. We derive semi-analytical bounds of the throughput and the average relay energy. We find the optimal relay energy distribution which maximizes the throughput by using dichotomy search. Numerical results confirm the accuracy of the derived closed form expressions and show the throughput improvement due to the relay energy optimization compared to the conventional cooperative ARQ scheme.
In this paper we formulate networkcoding (NC) and analog network coding (ANC) using analytical models to quantify ANC performance parameters. For this reason, a chain topology in a non-mutual transmission was investi...
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ISBN:
(纸本)9781479954230
In this paper we formulate networkcoding (NC) and analog network coding (ANC) using analytical models to quantify ANC performance parameters. For this reason, a chain topology in a non-mutual transmission was investigated. Our formulations demonstrate the benefit of NC and ANC over traditional approaches which depend on the number of transmission packets and the number of timeslots required for packets transmission in broadcasting scenarios. The advantage of this analytical approach is independence with respect to running a network simulation in order to evaluate the effect of the networkcoding schemes on the networks before proceeding to design or system simulation. The result shows ANC can improve capacity in the chain network as much as 50%.
In underwater acoustic networks, the objective that researchers are pursuing is establishing a network with high reliability, high throughput and low energy consumption. networkcoding can enhance reliability and thro...
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ISBN:
(纸本)9781467393744
In underwater acoustic networks, the objective that researchers are pursuing is establishing a network with high reliability, high throughput and low energy consumption. networkcoding can enhance reliability and throughput of network. Moreover, the throughput of network will be significantly improved by analog network coding. Accordingly, with higher reliability and higher throughput, the energy consumption will be lower. In this paper, the linear networkcoding and analog network coding are combined creatively. Besides, a SNR estimation algorithm is used to choose packets instead of choosing packets randomly for decoding. Afterwards, for taking advantage of the redundant packets better, packets are refreshed via bit-by-bit comparison. At last, we present numerical experiments to evaluate the performance of this scheme.
In this paper, we propose to improve a Cooperative Automatic Repeat reQuest (C-ARQ) scheme through the optimization of the distribution of the average relay energy cost in a two sources one destination wireless system...
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ISBN:
(纸本)9781479988518
In this paper, we propose to improve a Cooperative Automatic Repeat reQuest (C-ARQ) scheme through the optimization of the distribution of the average relay energy cost in a two sources one destination wireless system. We consider a BPSK modulated transmission over Rayleigh fading channels. We propose to use specific relay and destination treatment for different possible cases: both received packets are error free, only one received packet is detected erroneous or both received packets are detected erroneous at the destination. We derive semi-analytical bounds of the throughput and the average relay energy. We find the optimal relay energy distribution which maximizes the throughput by using dichotomy search. Numerical results confirm the accuracy of the derived closed form expressions and show the throughput improvement due to the relay energy optimization compared to the conventional cooperative ARQ scheme.
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