Joint source-relay selection in two-way full-duplex relay network
23 May 2016-pp 577-582
TL;DR: A practical joint source-relay selection scheme is proposed for this network, aiming to harvest selective diversity and power gain for reliable transmission, and shows that full cooperative diversity gain is achievable with the proposed scheme, and the selection on sources provides additional power gain.
Abstract: We investigate the outage probability of a variablegain amplify-and-forward (AF) relay network. A multi-source multi-relay network is considered with one destination and twoway traffic, where each node is equipped with two antennas and works on a full-duplex (FD) transmission mode. Meanwhile, the number of sources and relays is M and N, respectively. The residual self-interference, leaking from the full-duplex node's output to its input, exists in each node, and selective combing is performed at the source and the destination. In particular, we propose a practical joint source-relay selection scheme for this network, aiming to harvest selective diversity and power gain for reliable transmission. Unlike the existing schemes, we take the direct link from the source to the destination into consideration; therefore, it bears the potential to improve system stability. The proposed scheme only needs the local channel state information (CSI), and can be operated in a distributed manner. Furthermore, we derive a tight closed-form lower bound for the outage probability with the proposed scheme, and a simple asymptotic expression is also obtained with clear insights into the achievable diversity order. Our analysis shows that full cooperative diversity gain is achievable with the proposed scheme, and the selection on sources provides additional power gain. Finally, numerical results consolidate our theoretical analysis and show the effectiveness of the proposed scheme.
Citations
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TL;DR: Numerical results reveal that the optimal spectrum allocation rules can significantly vary for IBFD and OBFD backhauling, and proposes and comparatively analyzes the performance of two distributed backhaul spectrum allocation schemes, namely, maximum received signal power (max-RSP) and minimum received signalPower (min-R SP) schemes.
Abstract: In-band full-duplex (IBFD) backhauling is a potential technique for wireless backhauling of small cells that allows the use of same spectrum for the backhaul and access links of the small cell base stations (SBSs) concurrently, however, at the expense of backhaul interference and self-interference (SI). This paper investigates the problem of optimal access/backhaul spectrum allocation considering IBFD backhauling, out-of-band full-duplex (OBFD) backhauling (in which the access and backhaul transmissions take place on different spectrum), and the SBSs with the provisioning for hybrid IBFD/OBFD backhauling. We first formulate a problem to maximize the minimum achievable rate (i.e., minimum of the rates in the backhaul link and the access link) at the SBSs in a hybrid IBFD/OBFD setting. The solution of the centralized spectrum allocation problem, which serves as a benchmark for any sub-optimal solution, is provided by transforming the original problem into an epigraph form. As a special case of the formulated problem, we derive closed-form optimal solutions for the access/backhaul spectrum allocation of OBFD backhauling as well as IBFD backhauling. We then propose and comparatively analyze the performance of two distributed backhaul spectrum allocation schemes, namely, maximum received signal power (max-RSP) and minimum received signal power (min-RSP) schemes. For these schemes, we theoretically derive the number of allocated backhaul channels, minimum rate coverage probability, and average achievable rate of each SBS given its distance from the centralized wireless backhaul hub (WBH) for both IBFD and OBFD backhauling. Numerical results reveal that the optimal spectrum allocation rules can significantly vary for IBFD and OBFD backhauling. Optimal OBFD backhauling favors more backhaul spectrum for SBSs located far-away from the WBH. With IBFD backhauling, spectrum allocation for SBSs strongly depends on SI. With the reduction in SI, the optimal backhaul spectrum increases/decreases for nearby/farther SBSs. Simulation results comparing the optimal solution with the distributed spectrum allocation solutions based on max-RSP and min-RSP schemes are also presented.
66 citations
TL;DR: A distributed joint source, routing, and channel selection scheme that can effectively improve the network aggregate throughput, as well as reduce delay and packet loss probability.
Abstract: A node can provide a file to other nodes after downloading the file or data from the Internet. When more than one node have obtained the same file, this is considered a multisource transmission, in which all these nodes can act as candidate providers (sources) and transmit the file to a new request node (destination) together. In cases where there is negligible or no interference, multisource transmission can improve the download throughput because of parallel transmissions through multiple paths. However, this improvement is not guaranteed due to wireless interference among different paths. Wireless interference can be alleviated by the multiradio and multichannel technique. Because the source and multipath routing selections interact with channel assignment, the multisource transmission problem with multiradio and multichannel presents a significant challenge. In this paper, we propose a distributed joint source, routing, and channel selection scheme. The source selection issue can be concurrently solved via multipath finding. There are three sub-algorithms in our scheme, namely, interference-aware routing algorithm, channel assignment algorithm, and local routing adjustment algorithm. The interference-aware routing algorithm is used to find paths sequentially and is jointly executed with the channel assignment algorithm. After finding a new path, the local routing adjustment algorithm may be executed to locally adjust the selected paths so as to further reduce wireless interference. Extensive simulations have been conducted to demonstrate that our algorithms can effectively improve the network aggregate throughput, as well as reduce delay and packet loss probability.
51 citations
Cites background from "Joint source-relay selection in two..."
...On one hand, the authors of [17] and [18] explore joint source – relay selection in the physical layer, selecting a source – relay pair from multiple sources and multiple relays for a destination in a two-way cooperative network....
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TL;DR: It turns out that a significant throughput degradation occurs with FD mode over HD mode when self-interference is fully proportional to the transmit power, which is useful for user-fairness low-latency applications.
Abstract: This paper investigates a user-fairness relay selection (RS) problem for decode-and-forward (DF) full-duplex (FD) relay networks, where multiple users cooperate with multiple relays in each coherence time. We consider two residual self-interference (RSI) models with or without direct links. We propose a sub-optimal relay selection (SRS) scheme which requires only the instantaneous channel state information (CSI) of source-to-relay and relay-to-destination links. To evaluate the performance, the outage probability of SRS is derived for different scenarios depending on RSI models and the availability of direct links. To further investigate, asymptotic expressions are derived for the high-transmit power regime. For comparison purposes, 1) the average throughputs of the FD and half-duplex (HD) modes are derived; 2) non-orthogonal transmission is considered and its performance is discussed with approximations; and 3) the impact of imperfect CSI is investigated with the aid of analysis. While simulation results are provided to verify the analytical results, they reveal interesting fundamental trends. It turns out that a significant throughput degradation occurs with FD mode over HD mode when self-interference is fully proportional to the transmit power. Since all users can communicate in the same coherence time with the FD mode, these joint RS schemes are useful for user-fairness low-latency applications.
36 citations
Cites methods from "Joint source-relay selection in two..."
...A multi-source multi-relay network is considered with one destination for two-way network in [16], where the best source is selected based on the instantaneous signal-tonoise ratio (SNR) of the direct link and the best relay is selected by using the max-min principle based on the selected source....
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01 May 2017
TL;DR: It is shown that the JUFDRS scheme significantly outperforms the joint user and half-duplex relay selection (JUHDRS) scheme when the self-interference at the FD relay can be reasonably suppressed.
Abstract: We propose a novel joint user and full-duplex (FD) relay selection (JUFDRS) scheme to enhance physical layer security in a multi-user multi-relay network. In this scheme, the user and the FD decode-and-forward relay are selected such that the capacity of the end-to-end user-relay-destination channel is maximized to ensure the highest quality of cooperative transmission. To fully examine the benefits of the JUFDRS scheme, we derive a new closed-form expression for the secrecy outage probability. We show that the JUFDRS scheme significantly outperforms the joint user and half-duplex relay selection (JUHDRS) scheme when the self-interference at the FD relay can be reasonably suppressed. This result indicates that adopting the FD technique at relays can effectively enhance the physical layer secrecy performance in the multi-user multi-relay network.
11 citations
Cites background or methods from "Joint source-relay selection in two..."
...We assume that all channels experience block Rayleigh fading such that the channels remain constant over one block but vary independently from one block to another [18, 19]....
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...In practice, this model represents the uplink of a multi-user cellar system with multiple relays, which assist the user-destination transmission [14, 18]....
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...For exponentially distributed link gains, the CDF of γm,n is given by [18] Fγm,n(x) = 1− πSRe − x πSR...
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01 Oct 2016
TL;DR: The simulation results show that the proposed FDNF-TWR scheme can achieve the bit error rate performance of the half-duplex denoise-and-forward two-way relaying scheme when the self-interference is cancelled well.
Abstract: In this paper, we propose a full-duplex denoise-and-forward two-way relaying (FDNF-TWR) scheme with differential binary phase-shift keying (DBPSK) modulation, which do not need instantaneous channel state information. In the proposed scheme, two full-duplex source nodes exchange their information with the help of one full-duplex relay node. A non-coherent relay decoder takes the residual self-interference (RSI) into consideration and maps the received mixed signals into a denoised symbol. A non-coherent source decoder takes the RSI into consideration and obtains the symbol from the relay. The simulation results show that the proposed FDNF-TWR scheme can achieve the bit error rate performance of the half-duplex denoise-and-forward two-way relaying (HDNF-TWR) scheme when the self-interference is cancelled well.
4 citations
Cites background from "Joint source-relay selection in two..."
...Therefore, differential modulation combined with noncoherent detection which only needs long-term CSI becomes an attractive design alternative....
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...In this paper, we propose a full-duplex denoise-and-forward two-way relaying (FDNF-TWR) scheme with DBPSK modulation, which do not need instantaneous CSI....
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...In this section, we propose a FDNF-TWR scheme with DBPSK modulation, which do not need instantaneous CSI, as shown in Table I....
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...In contrast, long-term CSI is easier to obtain and requires less overhead [8]....
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...We assume both the channels between two nodes and the RSI channels are subjected to Rayleigh fading [10], and assume instantaneous CSI is unknown at any node but long-term CSI is known, i.e., h (t) ar ∼ CN (0, σ2ar), h(t)br ∼ CN (0, σ2br), h(t)ra ∼ CN (0, σ2ra), h (t) rb ∼ CN (0, σ2rb), h(t)rr ∼ CN (0, σ2rr), h(t)aa ∼ CN (0, σ2aa) and h(t)bb ∼ CN (0, σ2bb), where σ2ar, σ2br, σ2ra, σ2rb, σ2rr, σ2aa and σ2bb denote the corresponding channel gain....
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References
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20 Sep 2010
TL;DR: In this paper, a single channel full-duplex wireless transceiver is proposed, which uses a combination of RF and baseband techniques to achieve FD with minimal effect on link reliability.
Abstract: This paper discusses the design of a single channel full-duplex wireless transceiver. The design uses a combination of RF and baseband techniques to achieve full-duplexing with minimal effect on link reliability. Experiments on real nodes show the full-duplex prototype achieves median performance that is within 8% of an ideal full-duplexing system. This paper presents Antenna Cancellation, a novel technique for self-interference cancellation. In conjunction with existing RF interference cancellation and digital baseband interference cancellation, antenna cancellation achieves the amount of self-interference cancellation required for full-duplex operation. The paper also discusses potential MAC and network gains with full-duplexing. It suggests ways in which a full-duplex system can solve some important problems with existing wireless systems including hidden terminals, loss of throughput due to congestion, and large end-to-end delays.
1,623 citations
"Joint source-relay selection in two..." refers background or methods in this paper
...In [4], antenna separation, analogy and digital cancellation are proposed to mitigate the self-interference....
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...Some techniques to mitigate the selfinterference have been proposed in [3], [4]....
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TL;DR: This work shows that the average amount of cancellation increases for active cancellation techniques as the received self-interference power increases, and shows that digital cancellation is more effective when applied selectively based on measured suppression values.
Abstract: We present an experiment-based characterization of passive suppression and active self-interference cancellation mechanisms in full-duplex wireless communication systems. In particular, we consider passive suppression due to antenna separation at the same node, and active cancellation in analog and/or digital domain. First, we show that the average amount of cancellation increases for active cancellation techniques as the received self-interference power increases. Our characterization of the average cancellation as a function of the self-interference power allows us to show that for a constant signal-to-interference ratio at the receiver antenna (before any active cancellation is applied), the rate of a full-duplex link increases as the self-interference power increases. Second, we show that applying digital cancellation after analog cancellation can sometimes increase the self-interference, and thus digital cancellation is more effective when applied selectively based on measured suppression values. Third, we complete our study of the impact of self-interference cancellation mechanisms by characterizing the probability distribution of the self-interference channel before and after cancellation.
1,398 citations
"Joint source-relay selection in two..." refers background in this paper
...However, due to practical constraints, self-interference can not be mitigated completely [5]....
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TL;DR: Targeting at minimal interference power, a broad range of multiple-input multiple-output mitigation schemes are analyzed and the results confirm that self-interference can be mitigated effectively also in the presence of imperfect side information.
Abstract: Full-duplex relaying is more spectrally efficient than half-duplex relaying as only one channel use is needed per two hops. However, it is crucial to minimize relay self-interference to render full duplex feasible. For this purpose, we analyze a broad range of multiple-input multiple-output (MIMO) mitigation schemes: natural isolation, time-domain cancellation, and spatial suppression. Cancellation subtracts replicated interference signal from the relay input while suppression reserves spatial dimensions for receive and transmit filtering. Spatial suppression can be achieved by antenna subset selection, null-space projection, i.e., receiving and transmitting in orthogonal subspaces, or joint transmit and receive beam selection to support more spatial streams by choosing the minimum eigenmodes for overlapping subspaces. In addition, minimum mean square error (MMSE) filtering can be employed to maintain the desired signal quality, which is inherent for cancellation, and the combination of time- and spatial-domain processing may be better than either alone. Targeting at minimal interference power, we solve optimal filters for each scheme in the cases of joint, separate and independent design. The performance of mitigation schemes is evaluated and compared by simulations. The results confirm that self-interference can be mitigated effectively also in the presence of imperfect side information.
944 citations
"Joint source-relay selection in two..." refers background or methods in this paper
...In [3], three types of self-interference mitigation schemes are proposed, such as the natural isolation, the time-domain cancelation and the spatial suppression....
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...Some techniques to mitigate the selfinterference have been proposed in [3], [4]....
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...As [3], imperferct loop interference mitigation is performed at each node, and there still exists residual self-interference....
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TL;DR: This paper introduces and analyzes relaying techniques that increase the achievable throughput in multi-hop wireless networks by applying network coding over bi-directional traffic flows by introducing a relaying method based on amplify-and-forward (AF), where the relay node utilizes the inherent combining of packets provided by simultaneous transmissions over a multiple access channel.
Abstract: This paper introduces and analyzes relaying techniques that increase the achievable throughput in multi-hop wireless networks by applying network coding over bi-directional traffic flows. We term each such technique as bi-directional amplification of throughput (BAT)-relaying. While network coding is normally performed by combining decoded packets, here we introduce a relaying method based on amplify-and-forward (AF), where the relay node utilizes the inherent combining of packets provided by simultaneous transmissions over a multiple access channel. Under low noise levels, AF BAT-relaying offers a superior throughput performance. The unconventionality of AF BAT relaying opens many possibilities for further research.
381 citations
"Joint source-relay selection in two..." refers background or methods in this paper
...By applying network coding [9], TWR can increase the achievable throughput in multi-hop relay network....
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...HD TWR has been fully investigated in wireless network [9]–[11]....
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TL;DR: An optimal relay selection procedure that incorporates a hybrid relaying strategy, which dynamically switches between FD and half-duplex relaying according to the instantaneous CSI, is investigated.
Abstract: This paper focuses on the relay selection problem in amplify-and-forward (AF) cooperative communication with full-duplex (FD) operation. Different relay selection schemes assuming the availability of different instantaneous information are studied. We consider optimal relay selection that maximizes the instantaneous FD channel capacity and requires global channel state information (CSI) as well as several sub-optimal relay selection policies that utilize partial CSI knowledge such as a) source-relay and relay-destination links b) loop interference c) source-relay links and loop interference. To facilitate comparison, exact outage probability expressions and asymptotic approximations of these policies that show a zero diversity order are derived. In addition, an optimal relay selection procedure that incorporates a hybrid relaying strategy, which dynamically switches between FD and half-duplex relaying according to the instantaneous CSI, is also investigated.
342 citations
"Joint source-relay selection in two..." refers background in this paper
...It is noted that the RSI is modeled as a stochastic process [7], [8]....
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...Then the CDF of z = min ( |hmn|(2) , |fn|(2) ) can be expressed as [8]...
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