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Puncturing is a good way to achieve Rate-Compatible (RC) family codes with high rate. In this paper, asimple yet efficient puncturing strategy for Low Density ParityCheck (LDPC) codes with diagonal structure is proposed andanalyzed. In order to minimize the recovery step of puncturednodes, all the parity nodes (PNs) are assumed being punctured atfirst and then recovered step by step. The algorithm...
Long Term Evolution Advanced (LTE-A) is the fourth generation (4G) wireless cellular communication standard. A covert channel is a noticeable threat to network security because it is able to transfer data under the overt channel. In this paper, a new class of covert channel coined as SNsteg is proposed, designed for LTE-A system. The SNsteg peculiarly utilizes the feature of Sequence Number (SN) fields...
An original asymmetric coplanar (ACS)-fed filter which works in the ultra-wideband (UWB) frequency band is proposed in this article. This designed UWB filter by using a new structure brings out nice expressions like one transmission zero, which is benefit for the filter to have a sharp skirt near the 10.5 GHz. The bandwidth covers the whole UWB spectrum of 3–10.7 GHz, at the same time, the in-band...
Time synchronization is very important in many sensor network applications especially in industrial wireless network. If an adversary launches time synchronization attacks to the industrial wireless networks, the whole network communications will be paralyzed. However, the time synchronization is not insufficient to be protected in the current industrial wireless standards which based on IEEE802.15...
An ultra-low power multi-rate FSK transmitter implemented in 0.18 μm CMOS process is presented. A digital frequency interpolator is adopted in the transmitter for achieving multiple data rate transmission. Power consumption of the transmitter is dependent on the required transmitted data rate. Thus, high power efficiency can be achieved. As applying for implantable or wearable biomedical devices,...
The mine accident occurs so frequently. The reliability and Quality of Service (QOS) of underground emergency rescue communication system have decisive function on the rescue achievements. This article brings forward to apply 802.11EDCF protocol in MAC layer to underground emergency rescue communication system by analyzing the influence of 802.11 DCF to QOS system which is based on 802.11b/g network...
An ultra wideband low-noise amplifier (LNA) with shunt resistive-feedback is proposed for wideband input matching, broadband power gain and flat noise figure (NF) response. The proposed wideband LNA is implemented in TSMC 0.18µm CMOS technology. Measured results show that power gain is greater than 6.8 dB and input return loss (S11) is below −7 dB from 3.1 to 10.6 GHz. The minimax input 3rd-order...
Mining disasters are happened frequently in recent years. Because of odious underground environment and insufficiency emergency rescue equipments, the first aid for lives and property is strongly affected at the golden rescue time when accidents are happened. According to the special environment and requirements for emergency rescue communication system after disasters, the underground emergency rescue...
In this paper, joint optimization of subcarrier pairing, relay selection and power allocation is formulated through a capacity maximization problem in orthogonal frequency division multiplexing (OFDM) relay systems, with fairness considerations and individual power constraint on each node. Because achieving the optimal solution is computationally demanding, which is resulted from the excessive possibilities...
Barrier coverage is a hot issue in wireless sensor networks for its various applications, such as border surveillance and intrusion detection. In wireless sensor networks, it is a very important problem that how to prolong the network life time. In this paper, we focus on the problem that how to prolong the network lifetime for barrier coverage application. Firstly, the surveillance region is divided...
The design software used in the Matlab interface as the application development platform, and with a SQL Server database as the background data storage tool, in order to achieve efficient human-computer interaction function. From the results of view, the end result meets the design requirements, host computer receives a wireless sensor network module transmission to the temperature, humidity, air...
We consider relay selection technique in a cooperative cellular network where user terminals act as mobile relays to help the communications between base station (BS) and mobile station (MS). A novel relay selection scheme, called Joint Uplink and Downlink Relay Selection (JUDRS), is proposed in this paper. Specifically, we generalize JUDRS in two key aspects: (i) relay is selected jointly for uplink...
The wireless ad hoc networks (WANET) is an open system that is constituted by fix or mobile nodes. In WANET, each node can be a router or a host. Considering that most nodes may use battery as its energy, it is necessary to improve on energy-saving method. Based on the MAODV protocol, we bring forward a new method called PPEF that uses both hops and energy consumption level of each node together for...
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