Distributed Space-Time Code for Asynchronous Two-Way Wireless Relay Networks Under Frequency-Selective Channels

Zhong, Zhimeng; Zhu, Shixin; Lv, Gangming

doi:10.1109/icc.2009.5198936

Cited by 17 publications

(15 citation statements)

References 23 publications

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“…Recently, two-way relay network (TWRN) communications have gained much interest from researchers where two terminals exchange their information between each other through using relay nodes [6], [7], [8], [9]. In [6] the authors considered distributed space-time coding (DSTC) over flat fading channels while in [7] the authors considered DSTC over frequency selective channels. Furthermore, the asynchronization among the relay nodes combined with the multipath effects in TWRNs have been discussed in some recent studies such as [7], [8].…”

Section: Introductionmentioning

confidence: 99%

“…In [6] the authors considered distributed space-time coding (DSTC) over flat fading channels while in [7] the authors considered DSTC over frequency selective channels. Furthermore, the asynchronization among the relay nodes combined with the multipath effects in TWRNs have been discussed in some recent studies such as [7], [8]. Asynchronous delay-tolerant DSTCs for AFTWRNs were proposed in [7] to achieve full cooperative diversity.…”

Section: Introductionmentioning

confidence: 99%

“…However, most previous cooperative schemes have considered only one way communication [2], [3], [4], [5]. Recently, two-way relay network (TWRN) communications have gained much interest from researchers where two terminals exchange their information between each other through using relay nodes [6], [7], [8], [9]. In [6] the authors considered distributed space-time coding (DSTC) over flat fading channels while in [7] the authors considered DSTC over frequency selective channels.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extended orthogonal space-time block coding scheme in asynchronous two-way cooperative relay networks over frequency-selective fading channels

Alotaibi

Abdurahman

Mannai

et al. 2011

2011 17th International Conference on Digital Signal Processing (DSP)

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In this paper, we propose a new robust closed-loop extended orthogonal space-time block coding (EO-STBC) scheme for two-way four relay networks over frequency selective fading channels with imperfect synchronization. It is a three time slot scheme where the first one is specified for the two terminals while the other two are specified for amplify-and-forward (AF) relays. An orthogonal frequency division multiplexing (OFDM) data structure is employed at the two terminals using cyclic prefix (CP) insertion to combat the effect of multipaths and time asynchronicity. Full spatial diversity with array gain and code rate of 2 over 3 is achieved through applying a simple feedback approach over only two relays. Simulation results are used to show the performance improvements resulting from the proposed system. Furthermore, our scheme uses a simple symbol-wise maximum likelihood (ML) decoder to extract the information data. © 2011 IEEE

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Extended orthogonal space-time block coding scheme in asynchronous two-way cooperative relay networks over frequency-selective fading channels

Alotaibi

Abdurahman

Mannai

et al. 2011

2011 17th International Conference on Digital Signal Processing (DSP)

View full text Add to dashboard Cite

show abstract

“…However, this code functions in the binary field, meaning it cannot be employed in amplify-and-forward (AF) TWRNs. In [16][17][18], robust schemes against the relaying timing error are proposed. They use a sufficient cyclic prefix and/or performing physical-layer network coding.…”

Section: Prior Workmentioning

confidence: 99%

Improved signal detection for two-way wireless relaying networks under imperfect time synchronisation

Astal

Olivier

2014

EURASIP J. Adv. Signal Process.

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Most research on two-way wireless relaying networks (TWRNs) assumes perfect time synchronisation between the terminals and among the relays. This is, however, difficult to accomplish as the terminals and relays are randomly located. The lack of synchronisation causes inter-symbol interference which introduces a serious impairment and negatively impacts the network's performance. In this article, an enhanced interference cancellation (EIC)-based detector is proposed to mitigate the experienced performance degradation while maintaining low complexity. It uses an innovative iterative approach and also benefits of interference components of currently detected symbols using a modified maximum likelihood (ML) scheme. As a result, it shows significant performance improvement compared to the conventional detector under different conditions of imperfect synchronisation. In addition, two existing interference cancellation detectors that are originally proposed for one-way WRNs are extended to TWRNs, even though the timing error among the terminals is a unique issue for TWRNs and never occurs in one-way networks. Unlike the existing literature, the proposed detectors apply to networks with an arbitrary number of multiple-antenna relays. Numerical simulation is provided in terms of bit error rate, to show the improvement in performance when compared to the conventional detector. Moreover, it is shown that the EIC detector outperforms the extended detectors and provides 3 to 4 dB gain under moderate condition of imperfect synchronisation.

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“…This observation actually can raise many new code designs robust to time asynchronism for two-way cooperative network. Another DSTC approach proposed in the timedomain for frequency-selective channels is in [71], which is an extension of [41] from one-way cooperative network to the two-way case. For frequency domain approaches, in [28], the idea in [42] is utilized.…”

Section: Time Asynchronismmentioning

confidence: 99%

Asynchronous cooperative communication systems: A survey on signal designs

Wang

Xia

2011

Sci. China Inf. Sci.

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Cooperative communications is a promising technique for future high speed wireless communications. These systems may be formulated as virtual multi-input multi-output (MIMO) systems where spatial/cooperetive diversity is a key advantage. However, different from MIMO systems, one of the major challenges for cooperative communications systems is that the cooperative transmissions in cooperative systems may be neither time nor frequency synchronized, since the transmissions are from multiple cooperative nodes at different locations. The existing signal designs for co-located MIMO systems may not be able to collect the cooperative diversity in cooperative communications systems. This paper gives an overview of recent research efforts on combating the time and frequency asynchronism of the cooperative communication network. We focus on the signal designs (or space-time codings/modulations) to achieve full cooperative diversity, and summarize some of the resent distributed space-timing coding and space-frequency coding techniques to combat timing errors and frequency offsets, and in the meantime to achieve full cooperative diversity, in both one-way and two-way cooperative networks.

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Distributed Space-Time Code for Asynchronous Two-Way Wireless Relay Networks Under Frequency-Selective Channels

Cited by 17 publications

References 23 publications

Extended orthogonal space-time block coding scheme in asynchronous two-way cooperative relay networks over frequency-selective fading channels

Extended orthogonal space-time block coding scheme in asynchronous two-way cooperative relay networks over frequency-selective fading channels

Improved signal detection for two-way wireless relaying networks under imperfect time synchronisation

Asynchronous cooperative communication systems: A survey on signal designs

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