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In this paper we investigate the possibility to reconstruct the energy and direction of cosmic rays using a network of radio detectors. Measurements are influenced by the properties of the detection chain therefore its behavior is briefly discussed here. We present the response of the detection chain to radio pulses generated by cosmic particles with different characteristics.
This paper gives a research on enhanced ADS-B reception techniques. Extended Squitter reception using enhanced reception techniques will provide better performance. Elements of enhanced Extended Squitter reception include (1) the use of multiple amplitude samples to improve bit and confidence declaration accuracy and (2) more capable error detection/correction algorithms. The simulation results indicate...
This paper discusses the optimization and implementation of a new internet resource locating technology-Handle protocol and server. It introduces the basics of Handle protocol and the characteristics of Handle system. Then it focuses on the overall architecture, especially, the design of the Authority Cache and the Dynamic Thread Pool. The innovation of the paper is the proposal of a high performance...
The reconfigurable fault-tolerant routing algorithm in Mesh Topology Structure which belongs the field of network on chip has a feature, which is that the method achieves fault tolerance by using north last turning model and less-stored routing list. The reconfigurable fault tolerance routing algorithm has a series of merits: practical convenience, high fault-tolerance performance, low cost and little...
This Paper Investigates the effect of probability distribution equalization techniques on reducing the PAPR in NCOFDM widely used in Cognitive Radio Systems, and proposes the use of Arithmetic Coding to be used in NCOFDM for PAPR reduction. Simulation results show that the proposed Arithmetic Coding scheme can greatly reduce the PAPR of the NC-OFDM system. Furthermore, the results show that the Arithmetic...
Cognitive radio enabled dynamic spectrum access is a promising solution to alleviate the spectrum low-utilization problem. Secondary users need to sense the bands before transmitting on them to avoid collision with the licensed users. To reduce delay and energy consumption of spectrum sensing, spectrum prediction is incorporated to predict the future usage of channels before spectrum sensing. In this...
In order to exploit both spatial and temporal opportunities more thoroughly, this paper investigates the problem of spatiotemporal spectrum sensing for opportunity-heterogeneous cognitive radio networks, where secondary users located in different locations may experience different spectrum reuse opportunities. While the majority of existing researches focus on either spatial or temporal available...
We propose and analyze an unslotted CSMA with double back-off in multi-channel cognitive radio network. We model the system by 3-demensional continuous time Markov process, calculate the steady state probability of the system, and obtain several performance measures such as throughput and forced termination probability of SUs. By comparing the performances of CSMA scheme with single back-off and double...
According to the existing drawbacks of SC algorithm with a peak plateau and Minn and Park algorithms with side peaks, an improved OFDM synchronization algorithm is proposed based on training symbol. On the basis of the defect analysis of traditional methods, a new sequence is presented with conjugate symmetric structure and a new timing metric function is adopted with multiplication two correlation...
In this paper, an order reduction maximum likelihood (OR-ML) algorithm for spatial modulation systems is proposed to reduce the receiver complexity. The proposed algorithm relies on a smaller order neighbourhood constellation which is relative to the conventional mapping constellation, where the active transmitting antenna indices or the possible quadrant transmission symbols locate in is obtained...
In this paper, the purpose of the model is to integrate the queueing theory by implementing it through Cognitive Radio, the most recent development of Wireless Communication. In Cognitive Radio the licensed user has a higher priority than unlicensed user and so for transmitting data packets licensed user will be always getting the first opportunity. The Secondary user might detect if there is any...
Recently, subcarrier index modulation (SIM) combined orthogonal frequency division multiplexing (OFDM) has been developed as a new transmission technique. In this paper, we study a coded SIM-OFDM scheme where an encoder and decoder are employed. The transmitted bits are modulated onto the constellation points after coding. At the receiver, we provide a ML algorithms detecting method to get the soft...
In this paper, a baseband predistortion scheme is applied and implemented into real-time FPGA to linearize a Doherty power amplifier for wireless applications. The base-band behavioral models of the Doherty amplifier are based on the Memory Polynomial approach and the direct learning method is applied to estimate the model of the predistorter. For our Doherty power amplifier with a 256-QAM I/Q input...
A new perfect signal-binary complementary array pair set is presented under aperiodic correlation condition. The aperiodic correlation and equivalent transformation properties are proposed. The construction methods of 2-D complementary array pair set which is based on binary complementary sequence pairs set is presented, and the change dimension property is proved. Several binary complementary array...
In the recent days, the exponential growth in functionality of mobile devices leads the manufacturers to develop more and more sophisticated microprocessors and microcontrollers. The power requirements of the microprocessors are increasing day by day along with the processing speed and chip area. So, rather than traditional number systems, Residue Number System (RNS) is becoming attractive for their...
Role identification for network user plays a very important role in function and behaviour network analysis against criminal groups. Therefore, a network key role identification algorithm based on behaviour accumulation is proposed in the paper. Firstly, behaviour attribution of node (user) in network instance is extracted in the algorithm, description and abstraction of user behaviour by vector mode...
Considering the characteristics of ERA based wireless sensor networks architecture and the specific demand of tropical agriculture, this paper proposes a scheme which can be used in high temperature, multiple rain and so on, design and implementation wireless sensor network system of tropical agriculture. ERA is a new type of embedded architecture with the use of reconfigurable architecture, and the...
As wireless sensor networks are constituted of nodes with limited life batteries, energy efficiency is a very important metric at all levels of system design. Therefore, performing optimal modulation schemes is a crucial task at the physical layer of this class of networks. This paper investigates the best modulation strategy to minimize the total energy consumption required to send a given number...
In this paper, a pipeline wireless communication system for underwater environment applications is proposed. The system is designed to realize communication by penetrating water and metal pipeline. The communication system consists of magnetic antenna as communication antenna, and software using 2ASK modulation and demodulation technology. The details of the proposed pipeline communication design...
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