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We consider a range estimation algorithm based on the time-of-arrival differences between multipath replicas of a signal transmitted by an anchor node of known location to a silent node that needs to localize itself. We consider the geometry of the problem in the simplified case of a constant sound speed profile (SSP), and argue that the more realistic case of a non-constant SSP can be still tackled...
In this paper, a visible light communication (VLC) based localization algorithm is proposed for mobile device localization in indoor environments. The polar angle and azimuth angle measurements are first to estimate the projection position of light emitting diodes (LEDs) and then obtain the angle deviation estimation using the least square (LS) approach. The projection points in the reference coordination...
It is of great significance to choose the adaptive parameters of bistable system which not only ensure the phenomenon stochastic resonance can take palace but make the performance of the output signal optimum. In this paper, A precise parameter-tuned stochastic resonator (PSR) is proposed to improve the receiving performance of binary pulse amplitude modulated (BPAM) signal at low signal-to-noise...
In this paper, we propose a multi-layer multicast routing protocol for multi-hop mobile ad hoc cognitive radio (CR) networks. The proposed protocol employs a probabilistic approach in performing the channel assignment and path selection process based on the concept of minimum spanning tree (MST). Our protocol accounts for the unique features of CR operating environment. Simulations experiments are...
Data centers are considered as the indispensable infrastructure for cloud services nowadays. However, large-scale data centers use the traditional TCP protocol may experience performance issues, such as TCP incast. TCP incast is caused by the deficiency of TCP works for many-to-one traffic patterns on high-bandwidth, low-latency networks. In this paper, we propose a new TCP variant named Threshold...
By using a network approach, a wireless inductive link for power transmission from multiple transmitters to multiple receivers is considered. The problem of maximizing the power delivered to the receivers is solved and analytical formulas are presented and validated by circuital simulations.
It is well known that the full-duplex radio can enhance spectrum efficiency compared with half-duplex radio in inter-node interference free environment. However, in real situation, the inter-node interference is inevitable especially in the random access system whose performance is considerably affected by the interference. In this paper, we analyze the full-duplex system in random access scenario...
As a new way of power transmission, wireless power transmission (WPT) technology has an influence on the sides of lives, medical treatment, etc. In this paper, we did model analysis and simulation using its equivalent circuit model, which is on the basis of existed WPT technology. According to the most widely used MCR-WPT technology, we have built two-coil model and done simulation analysis so as...
Due to the rapid growth of Software-Defined Networks, we can manage network traffic easier than before. One of the major issues on SDN is the multipath routing protocols due to its complexity of optimum path selection among the multiple routes. In this paper, we focus on Multipath TCP (MPTCP). MPTCP is an extension of TCP that increases the throughput of TCP communication significantly by utilizing...
The communication link integrity of an Unmanned Aerial System (UAS) is influenced by a number of factors, the most relevant being antenna radiation pattern and gain, receiver sensitivity, output power, terrain relief, aircraft's attitude and trajectory, and frequency band. The constraints are especially severe in the context of beyond line-of-sight and low altitude flight plan. This work presents...
Modular-based channel hopping (CH) rendezvous algorithms can provide guaranteed rendezvous for Cognitive Radio Networks (CRNs) without time synchronization or Common Control Channels (i.e., blind rendezvous). Recently, the Enhanced Jump-Stay (EJS) scheme [13] has been proposed that decreases the Maximum Time To Rendezvous (MTTR) and the Expected Time To Rendezvous (ETTR) for users with a different...
Named Data Networking (NDN) is an Information-Centric Networking architecture that has recently attracted significant attention. NDN rethinks the Internet communication paradigm around the name of the data instead of its location. In Content-Oriented architectures, in-network caching enables data retrieval from different network nodes and may result in frequent data sources changes and wide RTT fluctuations...
Internet of things (IoT) is widely expected to be an important scenario in the fifth generation (5G) wireless network. Major challenges of IoT include the low cost of devices, low energy consumption, low latency and the ability to support a large number of simultaneous connections. In this article, a new type of non-orthogonal multiple access scheme called multi-user shared access (MUSA) is proposed...
Zigbee is a famous wireless communication system for its many advantages. The Co-channel interference (CCI) is a main interference to Zigbee network. The CCI in Zigbee system can be divided into two types. One comes from other wireless communication technology, for example, Bluetooth, WiFi. Another comes from other Zigbee wireless network. The paper main works conclude simulating Zigbee system based...
A novel PAM4 receiver with adaptive threshold voltage, adaptive decision feedback equalizer and fixed linear equalizer has been presented. The proposed techniques enable threshold voltage to be adjusted automatically depending on data rate, signal swing and loss of channel. Consequently the receiver can be used in various situations without being manually calibrated. Adaptive decision feedback equalizer...
As memory speed goes up higher and I/O counts continue to increase, simulations estimating SSN-induced jitter are necessary for timing quality [1]. Traditional SSN-induced jitter simulation for high-density I/O designs normally calculates transient noise from multiple aggressors on one victim in one time domain simulation. Multiple number of simulations are required to ensure the signal pin with worst...
Transmission systems using phased array antennas have been proposed, which made it possible to confine the communication area by switching the phase distribution for every symbol. These are known as directional modulation (DM), and the values of the phase shifters are chosen so that the phase of the desired signals on the constellation map is equal to those of the far fields of the phased array antenna...
Sharing Transmission Opportunity period (TXOP) technique is recently defined by IEEE 802.11ac to allow simultaneous downlink transmissions. In this paper, we focus on the basis of this technique and the behavior of the access point (AP) to manage the multi-user access. We discuss the different steps required to allow simultaneous downlink transmissions. Based on simulation results, we prove that TXOP...
A switch-based technique has been presented for efficient inductive power transmission at large coupling distances. Unlike the conventional inductive link, in which the receiver (Rx) LC-tank is utilized as a voltage source, the proposed link switches the Rx LC-tank in a novel fashion to act as a current source. Therefore, the voltage across the load (RL) can be significantly larger than the Rx LC-tank...
This paper describes a 2.4GHz low noise amplifier (LNA) intended for use in receiver system. The design has been done in 180nm technology using CMOS. The proposed LNA uses inductive degeneration technique. This amplifier provides a forward gain of 15.72dB with a low noise figure of .307dB while drawing 6.5mW from 1.8V supply voltage. The LNA uses a transformer as load. This paper presents a detailed...
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