Bi-directional Amplification of Throughput in a Wireless Multi-Hop Network

Popovski, Petar; Yomo, Hiroyuki

doi:10.1109/vetecs.2006.1682892

Cited by 279 publications

(221 citation statements)

References 4 publications

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“…Assume the message in the packet is further split into two parts, denoted as D (1) 0 and D (3) 0 , which are transmitted in the first and third step, respectively. Likewise, we let D 2 denote the information packet to be transmitted from node 2 to 0, and let it be split into D for transmission in the second and third steps.…”

Section: A Achievable Rate Region For Superimposed Xor Theorem 1 (4smentioning

confidence: 99%

Superimposed XOR: A New Physical Layer Network Coding Scheme for Two-Way Relay Channels

Liu

Tao

et al. 2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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Abstract-We present a new physical layer network coding (PLNC) scheme, called superimposed XOR, for two-way relay channels. The new scheme specifically takes into account the channel as well as information asymmetry in the broadcast phase of two-way relaying. It is based upon both bitwise XOR and symbol-level superposition coding. We first derive its achievable rate regions when integrated with two known time control protocols over Gaussian channels. We then demonstrate its average maximum sum-rate and service delay performance over fading channels. Compared with the existing bitwise XOR and symbol-level superposition coding, the proposed superimposed XOR scheme achieves larger rate region in asymmetric channels. As a result, it performs much better in terms of averaged maximum sum-rate and service delay over fading channels. Numerical results also show that the proposed practical PLNC closely approaches the capacity bound given by the informationtheoretic random binning.

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Section: A Achievable Rate Region For Superimposed Xor Theorem 1 (4smentioning

confidence: 99%

Superimposed XOR: A New Physical Layer Network Coding Scheme for Two-Way Relay Channels

Liu

Tao

et al. 2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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“…In [6], [7], a three time slot (TS) NC scheme based on decode-and-forward (DF) protocol was first introduced to TWRNs. By allowing two sources to transmit simultaneously to the relay, a two TS analog network coding (ANC) scheme with amplify-and-forward (AF) protocol [8], [9] and a two TS physical-layer network coding (PNC) scheme using estimated-and-forward (EF) protocol [10], [11] were proposed for TWRNs. It has been shown that exploiting NC in two-way relaying leads to substantial throughput increase with respect to the conventional four TS scheme.…”

Section: Introductionmentioning

confidence: 99%

Source and physical‐layer network coding for correlated two‐way relaying

Huo

Song

et al. 2016

IET Communications

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In this paper, we study a half-duplex two-way relay channel (TWRC) with correlated sources exchanging bidirectional information. In the case, when both sources have the knowledge of correlation statistics, a source compression with physical-layer network coding (SCPNC) scheme is proposed to perform the distributed compression at each source node. When only the relay has the knowledge of correlation statistics, we propose a relay compression with physical-layer network coding (RCPNC) scheme to compress the bidirectional messages at the relay. The closed-form block error rate (BLER) expressions of both schemes are derived and verified through simulations. It is shown that the proposed schemes achieve considerable improvements in both error performance and throughput compared with the conventional non-compression scheme in correlated two-way relay networks (CTWRNs).

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“…Narrowband physical layer network coding (PNC) schemes [4], [5] were shown to increase the capacity of bi-directional communication in a frequency-nonselective fading channel. To further improve the spectrum efficiency narrowband analog network coding (ANC), in [6], was introduced for communication over a frequency-nonselective fading channel without any processing at the relay which uses an amplify-and-forward (AF) scheme.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Analog Network Coding with Imperfect Channel Estimation in a Frequency-Selective Fading Channel

Gacanin¹,

Salmela

Adachi

2012

IEEE Trans. Wireless Commun.

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Abstract-Broadcast nature of the wireless channel enables wireless communications to make use of network coding at the physical layer (PNC) to improve the network capacity. Recently, narrowband and later broadband analog network coding (ANC) were introduced as a simpler implementation of PNC. The ANC schemes require two time slots while in PNC three time slots are required for bi-directional communication between two nodes and hence ANC is more spectrum efficient. The coherent detection and self-information removal in ANC require accurate channel state information (CSI). In this paper, we theoretically analyze the bit error rate (BER) performance with imperfect knowledge of CSI for broadband ANC using orthogonal frequency division multiplexing (OFDM), where the channel estimation error is modeled as a zero-mean complex Gaussian random variable. We investigate the BER performance for three cases: ( ) the effect of imperfect self-information removal due to channel estimation (CE) error with fading tracking errors, ( ) the effect of imperfect self-information removal due to CE error without fading tracking errors, and ( ) the ideal CE case. We discuss how, and by how much, our results obtained by theoretical analysis can be used for design of broadband ANC system with the imperfect knowledge of CSI. Our results show that imperfect channel estimation due to the noise effect has less impact on self-information removal than the imperfect channel estimation due to fading tracking errors. The tracking against fading is an important problem for accurate self-information removal as well as coherent detection and thus, the effect of channel time-selectivity is also theoretically studied. The achievable BER performance gains due to the polynomial time-domain channel interpolation are investigated using the derived close-form BER expressions and it was shown that the broadband ANC schemes with practical CE in a time-and frequency-selective channel should include a more sophisticated channel interpolation techniques since the impact of Doppler shift has prevalent effect on the achievable BER performance.

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Bi-directional Amplification of Throughput in a Wireless Multi-Hop Network

Cited by 279 publications

References 4 publications

Superimposed XOR: A New Physical Layer Network Coding Scheme for Two-Way Relay Channels

Superimposed XOR: A New Physical Layer Network Coding Scheme for Two-Way Relay Channels

Source and physical‐layer network coding for correlated two‐way relaying

Performance Analysis of Analog Network Coding with Imperfect Channel Estimation in a Frequency-Selective Fading Channel

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