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This paper investigates a specific NP-hard problem by comparing a depth-first search and a depth-first branch-and-bound algorithm as applied to network topology configuration in wireless ad hoc network planning. The vast amount of possible solutions in medium to large NP-hard problems makes algorithm methodology very important. State space algorithms are used to traverse through the solution space...
A new cross-layer proportional fair scheduling algorithm suited for delay tolerant traffic in both saturated and non-saturated regimes is presented. Unlike the classical proportional fair scheduling algorithm where the instantaneous rate is normalized by the past average throughput, in the proposed algorithm the normalization is done with respect to the past maximal values. And unlike cumulative distribution...
Rendezvous and Multi-channel Hidden Terminal problems are the two well-known challenges in developing a multi-channel MAC protocol. In literature, the Control Period Based (CPB) approach is proposed to cope with the rendezvous problem. Each channel is partitioned into several beacon intervals and each of which consists of ATIM window and data window. All hosts are asked to stay in every ATIM window...
Since 2008, we have been developing the integrated SoC, which incorporates from the ultra high speed multi-level QAM modem to the gigabit Ethernet interface, in a bid to adapt to the millimeter wave broadband wireless system. In 2009, we developed the SoC that functions on its maximum modulation clock 200 MHz, single-carrier 16QAM, and TDD, and managed to conduct field evaluation tests as a state...
Computerized interlocking systems have been studied for many years. Available interlocking systems mainly are centralized control systems. The great progress of distributed control technology and intelligent terminals make it possible to develop distributed interlocking system. To standardize operations of devices in distributed railway signaling system, this article takes the process of train entering...
This paper presents an analysis on energy dissipation of a digital half band filters operated in the the sub-threshold (sub-VT ) region with throughput constraints. The degradation of speed in the sub-VT domain is counteracted by unfolding the architectures. A filter is implemented in a basic 12-bit and its various unfolded structures. The designs are synthesized in a 65 nm low-leakage high-threshold...
This paper presents a new NoC Interface (NI) targeted for improving the performance of the Micronmesh Multiprocessor System-on-Chip (MPSoC). The previous version of the NI called Micronswitch Interface (MSI) can zero-copy messages as it sends and receives them. It offloads also some functionalities of the communication protocol from software (SW) to hardware (HW), but interrupt processing produces...
Shipping is of great significance in the integrated transport system, however, ship emissions cannot be neglected in assessing environmental impacts of air pollution and climate change. In order to quantitatively evaluate CO2 emission and mitigation opportunities of Wanzhou shipping in Chongqing municipality, China, we present the development of the CO2 emission inventory of Wanzhou shipping by using...
In this paper, a Johnson-encoded Reconfigurable Synchronous/Bi-Synchronous (RSBS) FIFO is proposed which can adapt its operation to either synchronous or bi-synchronous mode. The proposed FIFO which can be used to interface modules in Voltage/Frequency Islands (VFI) based Networks-on-chip, is capable of alleviating the excessive energy consumption and high performance overhead of the conventional...
In order to forecast the scale of logistics demand for a new-built airport, economic indicators are used to forecast the scale of logistics demand and the measuring indicator of the scale of logistics demand is studied. The factor analysis and back propagation (BP) artificial neural network theory are applied to set up a model to forecast the scale of the logistics. The application of factor analysis...
The cooperation in Beijing-Tianjin-Hebei have become a hot issue studied by governments, experts and scholars. Based on game theory and regional cooperation theory, this paper analyzed the current situation and development plan of airport construction in Beijing-Tianjin-Hebei, built the game model of airport construction, gave a theoretical explanation for the strategy choice of local governments...
With the development of the wireless communications technology and the multimedia technology, the wireless internet multimedia transport of real-time becomes an important applications field. We will meet a problem that the distinguish of the status of package loss is not very good which will affect the QoS when we transport multimedia data in wireless internet. Based on this problem the article comes...
In a downlink orthogonal frequency division multiple access (OFDMA) system, allocating sub-channels and power across multi-user can require excessive feedback of channel state information. An efficient proportional fair scheduling algorithm based on cluster feedback scheme is proposed in the paper. Simulation results show that the scheme needs only little feedback information while maintaining guaranteed...
Multi-parallel architecture for MD5 (Message-Digest Algorithm 5) implemented on FPGA (Field-Programmable Gate Array) is presented in this paper. To accelerate the speed, a general architecture for Host Computer and FPGAs is proposed. The MD5 implementation is presented. Besides the internal parallelization of MD5 modules, FPGAs can be easily duplicated and connected to Ethernet LAN. The design was...
Unlike traditional routing schemes that route all traffic along a single path, multipath routing strategies split the traffic among several paths in order to ease congestion. It has been widely recognized that multipath routing can be fundamentally more efficient than the traditional approach of routing along single paths. aiming at the increasing network traffic and the deficity that the former Ant...
Recently, a strong demand on high data rate wireless communication can be observed. The development of multi-gigabit wireless transmission systems has become very attractive. For achieving such data rates, the exploitation of 60 GHz mm wave is a very promising technical approach and has been adopted in IEEE 802.15.3c. Except for physical layer (PHY) designs, the Medium Access Control (MAC) layer design...
The LOS components of the base station (BS) can provide a high SNR to mobile stations (MSs), but they cannot achieve a high spatial multiplexing gain in the MIMO-OFDMA system. The spatial multiplexing gain is obtained by degrees of freedom between MIMO antenna arrays. MIMO channels should be uncorrelated to achieve the maximum degrees of freedom, and it depends on rich scattering environments which...
In many wireless systems, the energy consumed by the receiver is significantly larger than the energy consumed by transmitter, possibly even by orders of magnitudes. This paper derives an analytical solution to maximize the throughput per unit of available receiver circuit power. Adaptive control of the IP3, to handle the time-varying adjacent channel interference level, can substantially improve...
In view of the new feature after introducing the relay nodes (RNs) into the conventional cellular networks, a novel soft frequency reuse (SFR)-based inter-cell interference coordination (ICIC) scheme is proposed in the relay enhanced cellular networks. On the basis of original ICIC scheme for conventional cellular network, RNs in the proposed SFR scheme reuses part of neighboring cell-edge bands to...
Future wireless access will involve a variety of integrated and interworking technologies. Depending on the conditions (e.g., the specific application, the quality of service requirements, the user mobility) each session will be served through the most suited access network; following some event, there will be a variation of the access technology, which is called vertical handover. Although the use...
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