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In the existing works, a Kalman filter with recursive covariance estimation (KF-RCE) was proposed by Bo Feng et al. to sequentially estimating process noise covariance matrix. However, there may be a singular matrix existed in the KF-RCE algorithm, which would lead to unreasonable system state estimation in the system initial stage. In this paper, a threshold-based Kalman filter with recursive covariance...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
As one of the significant driving forces of the future broadband heterogeneous networks (5G), the Next Generation WLAN (NGW) has been initiated following the 802.11 HEW (High-Efficiency WLAN) study group with a focus on improving spectrum efficiency and area throughput. However, Low-Rate-Links (LRLs) severely degrade the overall wireless network performance, particularly under the dense environments...
Bandwidth-delay product (BDP) is an important indicator of the network capacity and usually used to measure the quality of a connection. In wireless ad hoc networks over IEEE 802.11, packets may be blocked due to link layer contention, and delay triggered by the contention called contention delay has been revealed has nothing to do with BDP. BDP in wireless ad hoc networks has been studied a lot to...
As the wireless networks become more and more popular currently, how to guarantee the Quality of Service (QoS) for high bandwidth traffic is a prime concern. Compared with most existing Medium Access Control (MAC) protocols using only a single wireless channel as the transmission medium, multi-channel MAC protocols have attracted intensive attention recently because of their capabilities of significantly...
An Orthogonal Frequency Division Multiple Access (OFDMA) downlink system with secure transmissions and delay constraints is investigated, in which a base station (BS) transmits both open data with delay limitations and private data with secrecy demands to each user. The time-varying channel is modeled as slow-fading and all channel state information (CSI) is assumed to be known to BS. An online cross-layer...
Decentralized channel state information is utilized to design a multichannel access algorithm for uplink transmission with power adaptation. The base station does not coordinate the transmissions of mobile users and hence users employ random access transmission. The situation is modeled as a non-cooperative game, where mobile users attempt to maximize its individual throughput gain with the least...
Network-on-Chip (NoC) has been widely accepted as one of the most promising on-chip communication architectures for many-core Systems-on-Chip (SoC). With billions of transistors integrated on a single chip, inter-component communication becomes more and more complicated and power hungry. By leveraging the existing technologies of computer networks, NoC enables the on-chip communication to be simpler...
Topology control algorithm for wireless Sensor Networks (WSNs) aims to adjust the network topology to improve network performance, such as throughput, connectivity and power-efficiency. In this paper, a novel adaptive topology control (ATC) method with an adjustable parameter is proposed to maximize the expected throughput and preserve connectivity and power efficiency. By tuning the adjustable parameter,...
This paper considers multiaccess control for the uplink in orthogonal-frequency-division-multiple-access (OFDMA) wireless networks. To avoid extensive information exchange with the access point in centralized approaches, we propose a distributed threshold-based scheme, where each user accesses multiple channels simultaneously based on a comparison between measured channel gains and a channel gain...
Considering that nodes move in wireless ad hoc networks, network topology and node locations change. A single transmission power can not meet mobile ad hoc networks. This paper proposes transmission power optimization algorithm based on various nearest-neighbor distances algorithm. Transmission node is informed of neighbor node locations in its maximum transmission range through network location management...
In order to avoid the loss of spectral efficiency (throughput) caused by half-duplex mode and further improve achievable throughput performance of wireless multi-hop network, a relaying technique that utilizes two sets of relays and physical network coding over bi-directional traffic flows is introduced. We term such technique as Bi-directional Successive Relaying based on Physical Network Coding...
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