WLC35-6: Relay-Assisted Spatial Multiplexing in Wireless Fixed Relay Networks

Onat, Furuzan Atay; Yanıkömeroğlu, Halim; Periyalwar, S.

doi:10.1109/glocom.2006.822

Cited by 22 publications

(28 citation statements)

References 18 publications

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“…In [15], the precoding design for multiple access channels (MACs) using regenerative bidirectional relaying has been addressed. Concerning a single-direction relay-assisted MAC, the outage performance has been analyzed in [16]. For broadcast channels (BCs), it is still hard to obtain the optimal precoding for a MIMO relay.…”

Section: Introductionmentioning

confidence: 99%

Joint Precoding Optimization for Multiuser Multi-Antenna Relaying Downlinks Using Quadratic Programming

Xu¹,

Dong

2011

IEEE Trans. Commun.

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Abstract-This paper studies the optimization problem for joint precoding design in a multi-antenna downlink channel using relaying. We formulate the joint source and relay precoding design by aiming at sum capacity maximization. Since this problem is in general nonconvex, we first convert this problem into standard convex quadratic programs, and then propose an iterative joint precoding optimization algorithm by utilizing efficient quadratic programming approaches. We observe that the iterative method always yields optimal precoding matrices which diagonalize the compound channel of the backward (sourceto-relay) and the forward (relay-to-destination) links at high SNR regimes. Motivated by this observation, we further develop an efficient structured precoding design. Simulation results are presented to verify the effectiveness of our proposed precoding schemes.Index Terms-Amplify-and-forward relay, multiple-input multiple-output (MIMO), joint precoding optimization, multiuser downlink channels, quadratic programming.

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Section: Introductionmentioning

confidence: 99%

Joint Precoding Optimization for Multiuser Multi-Antenna Relaying Downlinks Using Quadratic Programming

Xu¹,

Dong

2011

IEEE Trans. Commun.

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“…This approach suffers from error propagation when the relay transmits an erroneously decoded data block [6], [7]. Selective DF, where the relay only transmits when it can reliably decode the data packet, has been introduced as an efficient method to reduce error propagation [8]. However, the unsuccessful detection of the data packet by one or more relays can limit the benefit of relaying.…”

Section: Introductionmentioning

confidence: 99%

Analysis of packet combining for single carrier multi-relay broadband system

Chafnaji

Ait-Idir

Yanıkömeroğlu

et al. 2010

2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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Abstract-This paper focuses on packet combining for multi-relay systems operating over multiple-input-multiple-output (MIMO) broadband channel. The work presented in this paper is valid for both amplify-andforward (AF) and decode-and-forward (DF) relaying schemes. First, we drive a communication model in such a way that the destination can see the received signals during the relaying slots as direct retransmissions from the source. We then present a multi-slot communication model where transmission over relaying slots is translated into virtual receive antennas and examine the outage probability of different relaying schemes. Using simulations, we show that this schemes outperform each other depending on the relays location and demonstrate that the multirelay transmissions provide better diversity gain than the conventional hybrid-Automatic repeat request (ARQ).

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“…In general, the DF strategy suffers from error propagation [6], [7]. Selective DF overcomes this limitation by activating packet relaying only when a relay is able to correctly decode the data packet [8]. In the case of erroneous decoding at the relay, the incurring silence due to the inactivity ofthe relay to destination link reduces the overall system throughput.…”

Section: Introductionmentioning

confidence: 99%

Turbo packet combining for broadband MIMO relay communication

Ait-Idir

Chafnaji

Yanıkömeroğlu

et al. 2009

2009 Mediterrannean Microwave Symposium (MMS)

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Abstract-In this paper, we provide a survey of cooperative automatic repeat request (ARQ) protocols for multi-relay systems operating over multiple-input-multiple-output (MIMO) broadband channels. We study three main operating modes: amplify-and-forward (AF), decode-and-forward (DF), and positive/negative acknowledgment (ACK/NACK)-aided DF. We describe efficient minimum mean square error (MMSE) frequency domain equalization (FDE) iterative turbo packet combining techniques for cooperative ARQ, and show that they outperform conventional log-likelihood ratio (LLR)-based turbo combining.

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WLC35-6: Relay-Assisted Spatial Multiplexing in Wireless Fixed Relay Networks

Cited by 22 publications

References 18 publications

Joint Precoding Optimization for Multiuser Multi-Antenna Relaying Downlinks Using Quadratic Programming

Joint Precoding Optimization for Multiuser Multi-Antenna Relaying Downlinks Using Quadratic Programming

Analysis of packet combining for single carrier multi-relay broadband system

Turbo packet combining for broadband MIMO relay communication

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