Delay-Tolerant Distributed-TAST Codes for Cooperative Diversity

Damen, Mohamed Oussama; Hammons, A.R.

doi:10.1109/tit.2007.904773

Cited by 103 publications

(89 citation statements)

References 26 publications

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“…In time-domain approaches, various DSTCs without the requirement of time synchronization have been proposed [30][31][32][33][34][35][36][37][38][39][40][41]. In frequency-domain approaches, the basic idea is to treat the paths from cooperative nodes to the destination node as multipaths and then use OFDM technology [32,[42][43][44][45][46][47] to deal with the multipaths (or ISI).…”

Section: Time Asynchronismmentioning

confidence: 99%

“…Systematic constructions of such a family of codes are also investigated and obtained. Later, using the tool of algebraic number theory, delay-tolerant distributed threaded algebraic space-time (D-TAST) block codes are proposed in [37,38], which is similar to the TAST code in the MIMO case [50]. The term delay-tolerant code means that the code has the full diversity property under any delay profile.…”

Section: Time Asynchronismmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Time Asynchronismmentioning

confidence: 99%

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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“…We can well approximate the performance in high SNR situations by using an equivalent coherent receiver model (8) withȳ −1 acting as a known channel vector andw as the equivalent noise vector [25]. Since Σ , the covariance matrix ofw , is clearly a diagonal matrix, the equivalent noise remains uncorrelated but with unequal variance entries.…”

Section: A Pep Analysismentioning

confidence: 99%

“…Coding methods that tolerate the timing synchronization errors are discussed in [7], and [8]. However, these schemes come with the additional overheads to accommodate the timing mismatches.…”

mentioning

confidence: 99%

Differential Space-Time Network Coding for Multi-Source Cooperative Communications

Gao

Lai

Liu

2011

IEEE Trans. Commun.

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Abstract-Due to the asynchronous nature of cooperative communications, simultaneous transmissions from two or more nodes are challenging in practice. The existing cooperative communications employing successive transmission from one user node to the other can avoid the synchronization problem but results in large transmission delay. In addition, channel estimation in multisource cooperative communications is a challenging and costly task due to the amount of training, especially when the number of cooperative users is large. Considering these practical challenges in multi-source cooperative communications, this paper proposes a differential space-time network coding (DSTNC) scheme for narrowband multi-source cooperative communications to overcome the problems of imperfect synchronization and complex channel estimation without introducing large transmission delay. Each user in the network linearly combines the correctly decoded symbols via network coding and transmits its packet in time division multiple access (TDMA) mode. The pairwise error probability is analyzed and the design criteria of the DSTNC are derived to achieve full diversity. For broadband cooperative communications, distributed differential space-timefrequency network coding (DSTFNC), which is differentially encoded within each orthogonal frequency-division multiplexing (OFDM) block, is designed through mapping from the proposed DSTNC. When the statistical channel power-delay profile is known at the corresponding user node, each node can permutate its channel independently to improve the performance of the DSTFNC scheme. Simulation results are presented to verify the performance of the proposed schemes.

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“…Both steps drastically reduce the number of required timeslots, however resulting in imperfect synchronization during the single time-slot of the relaying phase. Nevertheless, recent advances in delay-tolerant codes [7] or joint frequency and timing synchronization [8] show that these issues can be mitigated. The proposed scheme is analyzed here in terms of spectral efficiency and bit error rate (BER).…”

Section: Introductionmentioning

confidence: 99%

Topology-aware space-time network coding

Torrea-Duran

Morales-Céspedes

Plata-Chaves

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-Space-Time Network Coding (STNC) is a timedivision multiple access (TDMA)-based scheme that combines network coding and space-time coding by allowing relays to combine the information received from different sources during the transmission phase and to forward the combined signal to a destination in the relaying phase. However, STNC schemes require all the relays to overhear the signal transmitted from all the sources in the network and also a large number of time-slots to achieve full diversity in a multipointto-multipoint transmission, which is particularly challenging for large cellular networks. In this paper, we exploit a basic knowledge of the network topology, i.e. the knowledge of the base stations overheard by other base stations and users, to reduce drastically the number of time-slots. Our results show that our scheme is able to increase the spectral efficiency with a marginal decrease of the spatial diversity compared to traditional STNC.

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Delay-Tolerant Distributed-TAST Codes for Cooperative Diversity

Cited by 103 publications

References 26 publications

Asynchronous cooperative communication systems: A survey on signal designs

Asynchronous cooperative communication systems: A survey on signal designs

Differential Space-Time Network Coding for Multi-Source Cooperative Communications

Topology-aware space-time network coding

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