Distributed Space-Time Cooperative Systems with Regenerative Relays

Anghel, P.A.; Leus, Geert; Kaveh, M.

doi:10.1109/twc.2006.04750

Cited by 59 publications

(31 citation statements)

References 26 publications

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“…So that each selected relay knows which column to transmit, most of the proposed Dis-STBC schemes [4][5][6][7] require a central control unit or full inter-node negotiations.…”

Section: Related Workmentioning

confidence: 99%

System With Excitation Control

Pravin¹,

Dani²

2011

IJMSR

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-Two ad-hoc, power allocation strategies for a decentralized distributed Space Time Block Coding (Dis-STBC) system is proposed in this paper where knowledge about the Channel State Information (CSI) is not available at the transmitter. The first is an open-loop strategy which requires no control signaling; the second is a feedback-assisted strategy which requires some control signaling, but which can achieve better power-efficiency. Focusing on a particular decentralized Dis-STBC scheme, the asymptotic outage probability is derived and the power-efficiency advantages of the proposed strategies over a uniform-power strategy are illustrated by evaluating the outage and link failure probabilities.Keywords: Channel State Information, decentralized distributed Space Time Block Coding, power allocation, outage and link failure probabilities. 1.INTRODUCTIONCooperative diversity is a diversity technique which is obtained when relay nodes are used for transmitting the signals. The source node transmits two independent signals to the relay node and the destination node, and the destination node receives signal from the source and the retransmitted signal from the relay node. With the help of relaying node the quality of the signal received at the destination can be improved. For notational simplification, system with three nodes namely source, relay and destination is considered.The history of the cooperative communication can find its deep roots to the groundbreaking work of [1], when the concept of relay channel model was introduced. The channel model consists of a source, destination and relay; and who's major purpose was to facilitate the information transfer from source to destination. Later, [2] deeply investigated the relay channel model, which provided a number of fundamental relaying techniques such as Decode and Forward (DF) and Compress and Forward (CF). In conventional communication, data is transmitted between the source and destination, and no user provides assistance to one another. 2.RELATED WORKA number of anonymous routing schemes have been proposed for ad hoc networks, and they provide different level of privacy protection.In [3], a distributed space-time block code (Dis-STBC) was proposed in which each relay transmits one unique column of the underlying STBC matrix. So that each selected relay knows which column to transmit, most of the proposed Dis-STBC schemes [4][5][6][7] require a central control unit or full inter-node negotiations.

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“…So that each selected relay knows which column to transmit, most of the proposed Dis-STBC schemes [4][5][6][7] require a central control unit or full inter-node negotiations.…”

Section: Related Workmentioning

confidence: 99%

System With Excitation Control

Pravin¹,

Dani²

2011

IJMSR

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“…For such a two-relay scenario, due to the half-duplex operation of the relays, for each source codeword, the space-timecoded standard DF relaying protocol [8], which is a practical example of the protocol proposed by [2], requires each source to broadcast the codeword to both relays and the destination in the first time slot (broadcasting step). The relays then retransmit the codeword (using a distributed Alamouti spacetime block code) to the destination in the second time slot (relaying step), as shown in Fig.…”

Section: A Repetition-coded Concurrent Df Relayingmentioning

confidence: 99%

Superposition-coded concurrent decode-and-forward relaying

Wang

Fan

Krikidis

et al. 2008

2008 IEEE International Symposium on Information Theory

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Abstract-In this paper, a superposition-coded concurrent decode-and-forward (DF) relaying protocol is presented. A specific scenario, where the inter-relay channel is sufficiently strong, is considered. Assuming perfect source-relay transmissions, the proposed scheme further improves the diversity performance of previously proposed repetition-coded concurrent DF relaying, in which the advantage of the inter-relay interference is not fully extracted.

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“…In [2], a DSTC multihop system in which source and relay share their antennas to create a virtual transmit array is considered in terms of average Bit Error Rate (BER) and achievable rate. Beside, in [3], the performance of DSTC systems with one and two nonregenerative relays is given, while the performance of DSTC systems with regenerative relays is done in [4]. The DSTC protocol for wireless multi-hop networks is lately designed and the performance for communication over more than two hops is analyzed in [5].…”

Section: Introductionmentioning

confidence: 99%

Non-regenerative full distributed space-time codes in cooperative relaying networks

Tran

Berder

Sentieys

2011

2011 IEEE Wireless Communications and Networking Conference

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Abstract-Distributed space-time codes (DSTC) are often used in cooperative relaying networks whose relays can support a single antenna due to the limited physical size. In this paper, full DSTC protocol in which there is a data exchange between relays before forwarding signals to destination is proposed to improve the performance of a cooperative relaying system. A lower bound for the average symbol error probability (ASEP) of full DSTC cooperative relaying system in a Rayleigh fading environment is provided. In the case when the Signal to Noise Ratio (SNR) of the relay-relay link is much greater than that of the source-relay link, the upper bound on ASEP of this system is also derived. From the simulations, we show that the average SNR gain of full DSTC system over DSTC system is 3.8dB and the maximum SNR gain is 5dB when the relay-relay distance is small and the relays are in the middle of the source and the destination. The effect of the distance between the relays shows that the performance does not degrade so much as the distance between relays is lower than a half of the source-destination distance. Moreover, we also show that when the error synchronization range is lower than 0.5, the impact of the transmission synchronization error of the relay-destination link on the performance is not considerable.

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Distributed Space-Time Cooperative Systems with Regenerative Relays

Cited by 59 publications

References 26 publications

System With Excitation Control

System With Excitation Control

Superposition-coded concurrent decode-and-forward relaying

Non-regenerative full distributed space-time codes in cooperative relaying networks

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