Path loss prediction model for the over‐rooftop propagation environment of microwave band in suburban areas

Hoàng

Sugimoto

et al. 2013

J Wireless Com Network

For high end-to-end channel capacity, the amplify-and-forward scheme multiple-hop multiple-input multiple-output relay system is considered. The distance between each transceiver and the transmit power of each relay are optimized to prevent some relays from being the bottleneck and guarantee high end-to-end channel capacity. According to the proposed transmission environment coefficient, the path loss can be described in a new way, and then the distance of multiple-hop relay system can be optimized more simply than the original one. However, when the system has no control on media access control (MAC) layer, performance of the system deteriorates because of the presence of interference signal. Thus, the specific transmission protocol on the MAC layer for multiple-hop system is proposed to reduce the power of interference signal and to obtain high end-to-end channel capacity. According to the proposed transmission protocol on the MAC layer, the system indicates the trade-off between the end-to-end channel capacity and the delay time. The end-to-end channel capacity of the outdated channel state information system is also analyzed.

“…However, in this paper, the reflection factor of all reflections is assumed to be the same and denoted by a. The path loss is expressed as follows [15][16][17][18][19][20][21]:…”

Section: Path Lossmentioning

confidence: 99%

End-to-end channel capacity of MAC-PHY cross-layer multiple-hop MIMO relay system with outdated CSI

Hoàng

Sugimoto

et al. 2013

J Wireless Com Network

“…However, in this paper, the reflection factor of all reflections is assumed to be the same and denoted by a. The path loss is expressed as [14] …”

Section: B Path Lossmentioning

confidence: 99%

End-to-end channel capacity of multiple-hop MIMO relay system with MAC-PHY cross-layer

2013 9th International Wireless Communications and Mobile Computing Conference (IWCMC)

Hoàng

Kohno

2013

For high end-to-end channel capacity, the amplifyand-forward scheme multiple-hop MIMO relays system is considered. The distance between each transceiver and the transmit power of each relay node are optimized to prevent some relays from being the bottleneck and guarantee the high end-to-end channel capacity. By proposing the transmission environment coefficient, the path loss is described in a new way and then the distance of multiple-hop relay system can be optimized more simply than the original one. However, when the system has no control on Mac layer, the performance of system is deteriorated because of the presenting of interference signal. Thus the specific control protocol on MAC layer for multiplehop system is proposed to reduce the power of interference signal and obtain the high end-to-end channel capacity. According to proposed control protocol on MAC layer, the system indicates the trade-off between the end-to-end channel capacity and the delay time.

“…However, in this paper, the reflection factor in all cases is assumed to be the same and denoted by a. The path loss in this case is expressed as [11] …”

Section: Path Lossmentioning

confidence: 99%

Capacity bound for full-duplex multiple-hop MIMO relays system in rayleigh fading

Wireless Telecommunications Symposium 2012

Kohno

2012

In multiple-hop relay systems, the system channel capacity is restricted by the bottleneck relay. In order to prevent some relays from being the bottleneck and guarantee the system channel capacity, the method for optimizing distance between each relays and transmit power of each relay is proposed in this paper. The optimizing both the distance and the transmit power is effective and can achieves high channel capacity. The bound of the downlink, the uplink channel capacity for each number of relays and the limitation of channel capacity when the number of relays tends to infinity, are found. The channel model is indicated the flat Rayleigh fading.