Optimizing Position of Repeaters in Distributed MIMO Repeater System for Large Capacity

Hiep, Pham Thanh; Kohno, Ryuji

doi:10.1587/transcom.e93.b.3616

Cited by 11 publications

(18 citation statements)

References 7 publications

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“…The transmit power and the distance have been optimized based on different numbers of relays in [12,13]; thus, in this paper, the number of relays is fixed as 4, and the SNR of all relays is assumed to be the same. The number of antennas of all relays, the Tx and the Rx is set as 6.…”

Section: Effects Of Wf Methodsmentioning

confidence: 99%

“…The f (λ) is a function of transmit power and path loss, meaning, the distance between each transceiver, the variance of noise vector, and the matrix of eigenvalue of channel model. The optimization of distance and transmit power was described in [12,13]; however, the transmit power of each antenna in the same relay is assumed to be equal. In order to improve the performance of a system, the WF method for the AF scheme MMRS is proposed.…”

Section: Table 1 System Parameters Of Each Transceivermentioning

confidence: 99%

“…Since the transmit power and the distance are fixed after optimization as optimization method in [12,13] and notice that Tr…”

Section: Table 1 System Parameters Of Each Transceivermentioning

confidence: 99%

“…Therefore, to obtain the upper bound of end-to-end channel capacity, the location of each relay node, meaning, the distance between each transceiver and the transmit power of each relay, should be optimized. We have analyzed the performance of MMRS with amplify-and-forward (AF) scheme [12,13] and decode-and-forward (DF) scheme [14]. The distance between each transceiver as well as the transmit power for each relay are optimized to obtain the upper bound of end-to-end channel capacity.…”

Section: Introductionmentioning

confidence: 99%

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Water-filling for full-duplex multiple-hop MIMO relay system

Hiep

Kohno

2014

J Wireless Com Network

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A water-filling (WF) method is one of the techniques to improve a performance of multiple-input multiple-output (MIMO) systems. However, the application of the WF method to multiple-hop MIMO relay systems (MMRSs) has not been discussed, especially in amplify-and-forward (AF) schemes. In this paper, the WF method for MMRSs with AF scheme is proposed and evaluated in both perfect and imperfect channel state information (CSI). The effect of imperfect CSI on optimization of transmit power at all transmitters and on co-channel interference is taken into account. Compared to the average transmit power, the end-to-end channel capacity of the WF method is higher in the perfect CSI; however, it is subject to the effect of imperfect CSI. Additionally, half-duplex and full-duplex transmission methods are also discussed in this paper. The end-to-end channel capacity of full duplex is higher and more robust than that of the half duplex due to a double of allocation time and a half of delay time.

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Section: Effects Of Wf Methodsmentioning

confidence: 99%

Section: Table 1 System Parameters Of Each Transceivermentioning

confidence: 99%

“…Since the transmit power and the distance are fixed after optimization as optimization method in [12,13] and notice that Tr…”

Section: Table 1 System Parameters Of Each Transceivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Water-filling for full-duplex multiple-hop MIMO relay system

Hiep

Kohno

2014

J Wireless Com Network

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“…MHMRSs have been analyzed in both decode and forward (DF) [8,9] and amplify and forward (AF) [10,11] schemes. We have optimized that distances between each transceiver transmit powers of every transmitter to improve the performance of MHMRSs whether there is a control on MAC layer [12,13] or not [14]. A problem of MHMRSs is the co-channel interference from adjacent relays that let the performance of MHMRSs deteriorate.…”

Section: Introductionmentioning

confidence: 99%

Co-channel interference cancellation using precoding for bi-direction multiple hops MIMO relay systems

Son

Hoàng

Hiep

2016

J Wireless Com Network

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In order to increase performance of a system while saving power consumption, multiple hop MIMO relay systems (MHMRSs) have been considered. There are many researches on the physical (PHY) layer, medium access control (MAC) layer, and MAC-PHY cross-layer to avoid a co-channel interference, such as the matched/orthogonal weight algorithm, TDMA-based smart antenna and so on. The matched/orthogonal algorithm is available for bi-directional communications; however, it requests at least three antenna elements at every relay. Consequently, it is unavailable for small wireless devices that are being demanded. In this paper, we propose an algorithm to cancel the co-channel interference of bi-directional communication MHMRSs by signal processing at receivers using precoding at transmitters. The proposal algorithm can perform with only two antenna elements while maintaining character of MIMO. The proposal algorithm is compared to the TDMA-based smart antenna algorithm which also can perform with two antenna elements, in both perfect and imperfect channel state information (CSI) schemes. Numerical calculation results indicate that a channel capacity of proposal algorithm is much higher than that of TDMA-based smart antenna algorithm in the perfect CSI scheme due to complete cancellation of co-channel interference and viability of bi-directional communications of proposal algorithm. In the imperfect CSI scheme, the channel capacity of the TDMA-based smart antenna algorithm is more robust when channel estimation errors increase; however, the channel capacity of proposal algorithm is still higher when the channel estimation error is large.Keywords: Co-channel interference cancellation using precoding, Multiple hop MIMO relay system, Channel capacity of system, Perfect and imperfect channel state information, TDMA-based smart antenna

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