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Due to the the harsh communication environment in Vehicular communications, the current applications and standards in vehicular ad-hoc networks (VANETs) can be applied for safety-related message exchange but in the future world, the other new applications for autonomous controlled vehicles require more reliability and capacity with small delay. Therefore, this paper proposes a new database of radio...
In Physical Layer Network Coding (PLNC), since the two sources access the relay station at a time, the relay station can hardly demodulate each information owing to the mutual interference between two transmitted signals. The PLNC achieves the high secure relay communication based on physical layer security (PLS). The source needs the transmit power control based on the channel state information (CSI)...
In vehicular communications, the current standards can be applied for safety-related message exchange but in the future world, other new applications like autonomous controlled vehicles require more reliability and capacity with small delay. Moreover, the harsh communication environment is one of the most difficult challenges. The line-of-sight (LOS) component of the signal in inter-vehicle connectivity...
Small cell networks enhance spectrum efficiency by handling the indoor traffic of mobile networks on a frequency-reuse operation. Because most of the current mobile traffic happens indoor, we introduce a prioritization shift by imposing a limitation on the outage generated by the outdoor mobile system to the indoor small cells. In this paper, we consider downlink spectrum sharing between a system...
We present the results of TV band sensing experiments performed in a suburban environment in Iizuka, Japan. This work adds to our previous work in which we proposed to exploit dynamic spectrum access techniques to facilitate use of the white space to solve shortage of spectrum for vehicular networks. Here, we focus on the terrestrial TV band spectrum sensing, which in addition to the "whitespace...
This paper proposes a new evaluation model considering cost based on a cost parameter to evaluate the performance of cellular system. One of the issues of the next generation cellular systems is the improvement of cell-edge throughput performance. In order to improve the cell-edge throughput performance and to extend the coverage area, relay transmission is becoming a promising technique. The cell-edge...
This paper proposes a user pairing control method for multi-cell shared multi-user MIMO relay (MC-MU-MIMO relay) to improve the throughput of cellular networks. MC-MU-MIMO relay system sets a multi-antenna relay station (RS) at the cell boundary and the RS is shared with adjacent cells. The proposed relay system can improve the throughput of cell boundary due to increasing signal to noise ratio and...
In this paper, we consider a relay system for a downlink communication of multi carrier code division multiple access (MC-CDMA) to improve the performance of cell-edge. However since different signals from the base station and the relay station affect different frequency-selective fading channels, the use of frequency-domain equalization at a receiver cannot restore the orthogonality of these signals...
In this paper we propose a broadcasting scheme with STBC (space time block codes) cooperative relay in multi-hop cellular network (MCN). In this scheme, base stations (BSs) broadcast the packets to mobile terminals (MTs) and relay stations (RSs), and at the next time slot, RSs which have correctly received the broadcast packets rebroadcast the packets with BSs simultaneously. In addition, when RSs...
This paper proposes a dynamic subcarrier utilization method using OFDM among the surrounding multi-hop nodes for improving the bottleneck node caused by unequal link quality of the flow from the source node to the destination node in TDMA multi-hop wireless networks. Although a flexible network can be realized by using multi-hop communication, a hidden node problem occurs between the links in the...
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