Distributed Linear Convolutive Space-Time Codes for Asynchronous Cooperative Communication Networks

Guo, Xiaoyong; Xia, Xiang-Gen

doi:10.1109/icc.2008.221

Cited by 29 publications

(43 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With recent advances in space-time codes, more and more novelty achievements in this area have been applied to construct asynchronous cooperative diversity schemes to improve the performance of the distributed space-time coding schemes [5][6][7]9].…”

Section: System Modelmentioning

confidence: 99%

See 1 more Smart Citation

A Rotated Quasi-Orthogonal Space-Time Block Code for Asynchronous Cooperative Diversity

Yao

Zhang

2012

Entropy

View full text Add to dashboard Cite

Abstract:The rotated quasi-orthogonal space-time block code (RQSTBC) for asynchronous cooperative diversity is proposed in this paper. The source selects half of the symbols from a signal constellation set and the other half of them from that constellation rotated with the optimum angle. Meanwhile, it constructs orthogonal frequency division multiplexing (OFDM) frames to counterbalance time delays of the signals. Then, relays create the frequency domain quasi-orthogonal space-time block transmitted signals matrix in such a way that its items are staggered to take on the Jafarkhani code structure or time-reversion of it. These three stages let the received signals at the destination take on RQSTBC structure with diversity order 4, which results in the fast symbol-pair-wise maximum likelihood (ML) decoder. Simulation results have shown that the proposed scheme outperforms the other asynchronous cooperative diversity schemes considered in this paper.

show abstract

Section: System Modelmentioning

confidence: 99%

“…Taking into account asynchronous characteristic of different mobile nodes, almost all of the distributed space time codes can achieve full diversity [5][6][7]. However, a few of them give attention to three all.…”

Section: Introductionmentioning

confidence: 99%

A Rotated Quasi-Orthogonal Space-Time Block Code for Asynchronous Cooperative Diversity

Yao

Zhang

2012

Entropy

View full text Add to dashboard Cite

show abstract

“…For time domain approaches, in [29], it has been shown that under the equivalent STC model of (11) and (12), a scheme similar to that in [40] can also achieve full cooperative diversity with linear or DFE receivers, as depicted in Figure 7. Since (11) is an AF protocol based model, this implies that even under AF protocol where the noise at cooperative nodes are also amplified and received at the destination, shift full rank property and linear receiver achieving full diversity still hold.…”

Section: Time Asynchronismmentioning

confidence: 99%

“…It is shown in [39] that all the above DSTTC can still maintain the full cooperative diversity when the delays from the cooperative nodes are fractional delays of symbol duration, without the synchronization assumption. In [40], the binary DSTTC studied in [34,35] are generalized to complex-valued linear convolutive trellis codes, and a family of distributed linear convolutive space time codes (DLC-STC) is proposed that can achieve full cooperative diversity even with the MMSE-DFE receiver 2) , without the synchronization assumption. Figure 4 shows the performances of some DLC-STC examples.…”

Section: Time Asynchronismmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

Asynchronous cooperative communication systems: A survey on signal designs

Wang

Xia

2011

Sci. China Inf. Sci.

View full text Add to dashboard Cite

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.

show abstract

Protocol design and data detection for two‐way relay networks with fractional asynchronous delays

Fang

Liang

Zhang

et al. 2012

Int J Communication

View full text Add to dashboard Cite

SUMMARYIn wireless two‐way relay systems, it is difficult to achieve perfect timing synchronization among different nodes. In this paper, we investigate relaying protocol design and data detect schemes for asynchronous two‐way relaying systems to combat the intersymbol interference caused by asynchronous transmission. We consider fractional asynchronous delays and two schemes are proposed based on cyclic prefixed single carrier block transmission, namely, the receiver frequency domain equalization scheme and relay synchronization and network coding (RSNC) scheme. In the receiver frequency domain equalization scheme, the relay simply amplifies the received signal and forwards to the two source nodes, and fractionally spaced frequency domain equalizer (FS‐FDE) is employed at the receiver to recover the transmit data. In the RSNC scheme, the asynchronous signals are resynchronized with an FS‐FDE at the relay node. The output signals of FS‐FDE are then demodulated and network coded before forwarding to the two source nodes. In this RSNC scheme, data detection at the source nodes is the same as that in synchronous networks because the asynchronous signals have already been synchronized at the relay node. Simulation results show that the performance of both schemes is almost the same as in the perfect synchronized two‐way relaying systems. Copyright © 2012 John Wiley & Sons, Ltd.

show abstract

Distributed Linear Convolutive Space-Time Codes for Asynchronous Cooperative Communication Networks

Cited by 29 publications

References 24 publications

A Rotated Quasi-Orthogonal Space-Time Block Code for Asynchronous Cooperative Diversity

A Rotated Quasi-Orthogonal Space-Time Block Code for Asynchronous Cooperative Diversity

Asynchronous cooperative communication systems: A survey on signal designs

Protocol design and data detection for two‐way relay networks with fractional asynchronous delays

Contact Info

Product

Resources

About