Design criteria and performance analysis for distributed space-time coding

Seddik, Karim G.; Sadek, Ahmed K.; Ibrahim, Ahmed S.; Liu, K. J. Ray

doi:10.1109/tvt.2007.912145

Cited by 42 publications

(39 citation statements)

References 35 publications

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“…It is well known that due to the diagonal structure of the broadcasting phase, as shown in (1), the problem of perfect timing synchronization is alleviated since within the TDMA framework, only one source node is allowed to transmit at any one time [24]. Moreover, the analysis so far assumed perfect 'in-phase' synchronization among the transmitting nodes in the cooperation phase.…”

Section: Timing Synchronization Analysismentioning

confidence: 99%

Many-to-many space-time network coding for amplify-and-forward cooperative networks: node selection and performance analysis

Baidas

MacKenzie

2014

J Wireless Com Network

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In this paper, the multinode amplify-and-forward cooperative communications for a network of N nodes is studied via the novel concept of many-to-many space-time network coding (M2M-STNC). Communication under the M2M-STNC scheme is performed over two phases: (1) the broadcasting phase and (2) the cooperation phase. In the former phase, each node broadcasts its data symbol to all the other nodes in the network in its allocated time slot, while in the latter phase, simultaneous transmissions from N − 1 nodes to a destination node take place in their time slot. In addition, the M2M-STNC scheme with optimal node selection (i.e., M2M-STNC-ONS) is proposed. In this scheme, the optimal relay node is selected based on the maximum harmonic mean value of the source, intermediate, and destination nodes' scaled instantaneous channel gains. Theoretical symbol-error-rate analysis for M-ary phase shift keying (M-PSK) modulation is derived for both the M2M-STNC and M2M-STNC-ONS schemes. Also, the effect of timing synchronization errors and imperfect channel state information on the SER performance and achievable rates is analytically studied. It is shown that the proposed M2M-STNC-ONS scheme outperforms the M2M-STNC scheme and is less sensitive to timing offsets and channel estimation errors. It is envisioned that the M2M-STNC-ONS scheme will serve as a potential many-to-many cooperative communication scheme with applications spanning sensor and mobile ad hoc networks.

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Section: Timing Synchronization Analysismentioning

confidence: 99%

Many-to-many space-time network coding for amplify-and-forward cooperative networks: node selection and performance analysis

Baidas

MacKenzie

2014

J Wireless Com Network

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“…Another way to realize multi-node cooperation is through distributed space-time coding (DSTC), where the relay nodes perform linear coding on the received signals. The distributed space-time block coding (DSTBC) and the diagonal distributed space-time coding (DDSTC) have been studied in [11] and [12], respectively, and some code design examples can be found in [13] [14].…”

Section: Diversity Analysis Of Analog Network Coding Withmentioning

confidence: 99%

Diversity Analysis of Analog Network Coding with Multi-User Interferences

Guan

Liu

2013

IEEE Trans. Wireless Commun.

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Abstract-Network coding can improve the bandwidth efficiency by letting multiple users share the relay channels. However, the multi-user interferences (MUI) at the intended receiver may degrade the diversity performances. So in this work, we study several diversity strategies for the multiple-access relay channel and analyze the impact of MUI on the diversity performances. Both the variable gain relaying (VGR) and the fixed gain relaying (FGR) are considered, where the relay nodes are subject to instantaneous power constraints and long-term power constraints, respectively. We first develop a Min-Max relay selection strategy and prove that full diversity can be achieved. Next, the distributed space-time block coding (DSTBC) and the diagonal distributed space-time coding (DDSTC) are studied. For DSTBC, we show that full diversity can be achieved by FGR, but the diversity of VGR is upper bounded by min (L + 1, K + 1), where L and K are the number of relays and users, respectively. For single-user systems, we then develop a selective DSTBC-VGR scheme to recover the diversity loss by adaptively allocating the relay power. Finally for DDSTC, we show that both FGR and VGR can achieve full diversity, and the optimum code design criterion is to maximize the minimum product distance.

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“…It was illustrated that relay-selection cooperative schemes achieve high bandwidth efficiency while guaranteeing full diversity order. Distributed space-time cooperative schemes, in which the helping relays simultaneously forward modified version of the source's information, have been proposed and analyzed in [7], [8]. It was shown that distributed cooperative schemes, under certain conditions, can achieve full diversity order.…”

Section: Introductionmentioning

confidence: 99%

“…Cooperative communication protocols make use of the broadcast nature of wireless channels, where a number of relay nodes are assigned to help a source in forwarding its information to its destination, hence forming a virtual antenna array. Various cooperative diversity protocols were proposed and analyzed in [1], [2], [3], [4], [5], [6], [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Mitigating channel estimation error via cooperative communications

Ibrahim

Liu

2009

2009 IEEE International Conference on Communications

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Abstract-Channel estimation error problem is among the main causes of performance degradation in wireless networks. In this paper, we investigate the impact of cooperative communications on mitigating the effect of channel estimation error. Two main performance criteria, namely, the traditional outage probability and the proposed signal-to-noise ratio (SNR) gap ratio, are utilized to characterize such impact. The SNR gap ratio measures the reduction in the SNR due to channel estimation error. Taking into consideration the channel estimation error, we show that the outage probability is reduced by utilizing cooperative transmission. We also show that cooperative transmission results in lower SNR gap ratio compared to that of the direct transmission. Thus, cooperative transmission is less susceptible to the effect of channel estimation error compared to direct transmission. Finally, we illustrate that increasing the number of cooperating relays reduces the effect of the channel estimation error more. I. INTRODUCTIONRecently, cooperative communications for wireless networks have gained much interest due to its ability to mitigate fading in wireless networks through achieving spatial diversity, while resolving the difficulties of installing multiple antennas on small communication terminals. Cooperative communication protocols make use of the broadcast nature of wireless channels, where a number of relay nodes are assigned to help a source in forwarding its information to its destination, hence forming a virtual antenna array. Various cooperative diversity protocols were proposed and analyzed in [4]. It was shown that the conventional cooperative communication scenario, in which each of the available N relays forwards the source's information over an orthogonal channel (e.g. time or frequency slot), achieves full diversity order equal to N +1. However, the bandwidth efficiency drops to 1/(N + 1) symbols per channel use (SPCU). In [5], [6] various relay selection cooperative schemes, in which only one relay forwards the source's information, have been proposed. It was illustrated that relay-selection cooperative schemes achieve high bandwidth efficiency while guaranteeing full diversity order. Distributed space-time cooperative schemes, in which the helping relays simultaneously forward modified version of the source's information, have been proposed and analyzed in [7], [8]. It was shown that distributed cooperative schemes, under certain conditions, can achieve full diversity order.Channel estimation error, caused possibly by Doppler shift or noise on the pilot signals, can cause dramatic performance degradation in wireless networks. In [9], it was examined that

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Design criteria and performance analysis for distributed space-time coding

Cited by 42 publications

References 35 publications

Many-to-many space-time network coding for amplify-and-forward cooperative networks: node selection and performance analysis

Many-to-many space-time network coding for amplify-and-forward cooperative networks: node selection and performance analysis

Diversity Analysis of Analog Network Coding with Multi-User Interferences

Mitigating channel estimation error via cooperative communications

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