The road to IMT-advanced communication systems: State-of-the- art and innovation areas addressed by the WINNER + project

Osseiran, Afif; Hardouin, Eric; Gouraud, Alexandre; Boldi, Mauro; Cosovic, I.; Gosse, K.; Luo, Jijun; Redana, Simone; Mohr, W.; Monserrat, José F.; Svensson, Tommy; Tölli, Antti; Mihovska, Albena; Werner, Marc

doi:10.1109/mcom.2009.5116799

Cited by 36 publications

(19 citation statements)

References 9 publications

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“…Remark 3: If the relay is a fixed station (such as in Winner project, LTE and IMT-Advanced [19], [20]), the distance between adjacent transmit antennas at the relay is large, and it is possible that . In that case, the proposed closed-form solution is exactly the optimal solution.…”

Section: The Proposed Closed-form Solutionmentioning

confidence: 99%

“…In particular, capacity bounds for AF MIMO relay systems have been derived in [14] and [15], and optimal power allocation schemes which maximize the capacity of AF MIMO relay systems have been studied in [5], [6], and [16]- [18]. Furthermore, for practical applications (such as Winner project, LTE and IMT-Advanced [19], [20]), fixed relay stations with multiple antennas are being considered to be installed at the border of base stations' coverage area, to enhance the coverage of base stations.…”

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confidence: 99%

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Robust Joint Design of Linear Relay Precoder and Destination Equalizer for Dual-Hop Amplify-and-Forward MIMO Relay Systems

Xing

2010

IEEE Trans. Signal Process.

180

206

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Abstract-This paper addresses the problem of robust linear relay precoder and destination equalizer design for a dual-hop amplify-and-forward (AF) multiple-input multiple-output (MIMO) relay system, with Gaussian random channel uncertainties in both hops. By taking the channel uncertainties into account, two robust design algorithms are proposed to minimize the mean-square error (MSE) of the output signal at the destination. One is an iterative algorithm with its convergence proved analytically. The other is an approximated closed-form solution with much lower complexity than the iterative algorithm. Although the closed-form solution involves a minor relaxation for the general case, when the column covariance matrix of the channel estimation error at the second hop is proportional to identity matrix, no relaxation is needed and the proposed closed-form solution is the optimal solution. Simulation results show that the proposed algorithms reduce the sensitivity of the AF MIMO relay systems to channel estimation errors, and perform better than the algorithm using estimated channels only. Furthermore, the closed-form solution provides a comparable performance to that of the iterative algorithm.Index Terms-Amplify-and-forward (AF), equalizer, minimum mean-square-error (MMSE), multiple-input multiple-output (MIMO), precoder, relay.

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Section: The Proposed Closed-form Solutionmentioning

confidence: 99%

mentioning

confidence: 99%

Robust Joint Design of Linear Relay Precoder and Destination Equalizer for Dual-Hop Amplify-and-Forward MIMO Relay Systems

Xing

2010

IEEE Trans. Signal Process.

180

206

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“…One approach to solve the issue is a multi-BS cooperative transmission control technique, which is referred to as coordinated multi-point (CoMP) transmission in 3rd Generation Partnership Project (3GPP) Long Term Evolution Advanced (LTE-Advanced) standardization activities, is especially attracting attention. Various technologies have been proposed for CoMP to improve cell-edge performance [7][8][9][10][11][12][13][14]. Most of these techniques are based on joint transmission (JT), in which multiple BSs coordinate their antennas to jointly transmit the desired signal to the user equipment (UE) [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Various technologies have been proposed for CoMP to improve cell-edge performance [7][8][9][10][11][12][13][14]. Most of these techniques are based on joint transmission (JT), in which multiple BSs coordinate their antennas to jointly transmit the desired signal to the user equipment (UE) [12][13][14]. We have proposed a simple JT implementation technique and conducted a field trial that confirmed its feasibility and performance [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Multi-BS Cooperative Interference Control for LTE Systems

Ogata

Nagate

Fujii

2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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Inter-Cell Interference Coordination (ICIC) is attracting attention recently. In ICIC, cell-edge throughput can be improved by preventing BSs from transmitting signals (hereafter, muting BSs), and the information exchange among BSs is little because each UE is only served by a BS at any instant. However, when a BS is muted, no radio resource is allocated to UEs belonging to the muted BS while UEs belonging to other BSs enjoy high cell-edge throughput. Therefore, there is a possibility that overall cell performance may degrade. To prevent this, we propose a multi-BS cooperative interference control method. The basic concept of the proposed method is that the muting is triggered only when the total throughput of the cooperation area is increased by the muting compared to the total throughput possible without muting. The proposed method makes it possible to increase cell-edge throughput without degrading overall cell performance. We also propose a way to realize this interference control on practical systems. First, we propose a way to realized it on 3GPP Release 8 LTE systems. In the proposed interference control, it is important to estimate throughput (SINR) values with and without muting appropriately. We propose to utilize feedback signals defined in LTE such as Channel Quality Indicator (CQI) and Received Signal Received Power (RSRP) to achieve the accurate throughput estimation. Furthermore, we propose to realize the proposed interference control on a distributed sector configuration using optical fiber systems such as Radio over Fiber (RoF) or Remote Radio Head (RRH). With this configuration, it is possible to achieve ICIC with less burden of information exchange. Especially with three sector configuration, it is possible to achieve "inter-cell" cooperation with "inter-sector" cooperation, which can be easily implemented.

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Radio over Fiber System Design for Distributed Broadband Wireless Systems

Wake

Gomes

2012

Next Generation Wireless Communications Using Radio Over Fiber

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The road to IMT-advanced communication systems: State-of-the- art and innovation areas addressed by the WINNER + project

Cited by 36 publications

References 9 publications

Robust Joint Design of Linear Relay Precoder and Destination Equalizer for Dual-Hop Amplify-and-Forward MIMO Relay Systems

Robust Joint Design of Linear Relay Precoder and Destination Equalizer for Dual-Hop Amplify-and-Forward MIMO Relay Systems

Multi-BS Cooperative Interference Control for LTE Systems

Radio over Fiber System Design for Distributed Broadband Wireless Systems

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