In this paper, we derive the averaged bit and symbol error probabilities as approximated closed-forms for M-ary quadrature amplitude modulation (MQAM) burst transmission of adaptive decode-and-forward (ADF) relay systems over quasistatic Rayleigh fading channels. Within a burst, there are pilot symbols and data symbols. Pilot symbols are used for channel estimation schemes and each relay node's transmission mode selection schemes. The approximated error rate expression is verified based on the number of relays, pilot, and data symbols. Its accuracy is confirmed by comparing with simulation results.

In this demonstration, we present the implementation of IEEE 802.11p real-time feasible transceiver by using USRP-RIO by LabVIEW Communications. To implement this system, we used the 802.11 Application Framework and FPGA-based USRP-RIO. The 802.11 Application Framework is comprised of modular physical layer (PHY) and medium access control (MAC) blocks implemented using LabVIEW Communications. Furthermore, in order to verify the system performance for the wireless channel environment (multi-path Rayleigh fading channel), we added the wireless channel models in [1] and will add channel estimation schemes in [1] on FPGA.

In order to support the mobility of vehicles and reliable services in the Institute of Electrical and Electronics Engineers (IEEE) 802.11p/wireless access in vehicular environments (WAVE) network, cell planning and coverage optimization are critical issues. In light of this, we employed the IEEE 802.11p/WAVE test-bed located at the Chungju campus of the Korea National University of Transportation (KNUT). We proposed a prediction model by using a 3D ray-tracing tool with geographic information system (GIS) data for cell planning and coverage optimization. Furthermore, we developed the WAVE geometric measurement studio (WGMS), which can be used as a tool for the cell planning and deployment of IEEE 802.11p/WAVE wireless networks. By comparing the measurement campaign results with the simulated results, it is confirmed that the proposed prediction model and the developed WGMS can together be used as a general solution tool to reduce the cost and time consumption for the cell planning and optimization of IEEE 802.11p/WAVE wireless networks.

The Convergence-Information Technology Research Center for Next-Generation Intelligent Transport System (C-ITRC for NGITS) deployed the IEEE 802.11p/Wireless Access in Vehicular Environments (WAVE) test-bed located in the Chungju campus of Korea National University of Transportation (KNUT). We developed the WAVE Geometric Measurement Studio (WGMS), which can be used as a tool for the cell planning and optimization of IEEE 802.11p/WAVE wireless networks. Furthermore, we proposed the prediction model by using ray-tracing tool for cell planning and coverage optimization. By comparing the results of measurement campaign with simulation results, it is confirmed that both the proposed prediction model and the developed WGMS can be used as a general solution tool to reduce the cost and the time consumption required for the cell planning and optimization of IEEE 802.11p/WAVE wireless networks.

In this paper, we propose the analytical approach for adaptive decode-and-forward (ADF) relaying vehicle-to-infrastructure (V2I) schemes consisting of ND-symbol burst data transmission based on pilot symbol assisted-channel estimation (PSA-CE) methods over quasi-static Rayleigh fading channels. At first, we focus on the error-event at relaying on board equipments (OBEs) for ND-symbol burst data transmission, whereas previous researches considered one data symbol transmission so that they showed the best performance bounds. By considering ND-symbol burst for ADF relaying schemes, we derive an exact bit error rate (BER) expression which can be the performance of practical systems. Moreover, the practical channel estimation (CE) process is considered by pilot symbols transmission. Then, we investigate the effects of both a CE error and an estimated noise variance, which can be obtained by pilot symbol assisted (PSA)-CE methods, on the received signal-to-noise ratio (SNR) and BER. Furthermore, the average BER is derived in approximated closed-form expression for an arbitrary link SNR. The derived analytical approach is verified based on the number of relaying OBEs, pilots, and data symbols. Its accuracy is confirmed by comparison with simulation results.

2009년 이후부터 스마트폰 및 태블릿 PC의 사용자수는 기하급수적으로 늘고 있다. 특히 성장의 중심에는 애플의 iOS와 구글의 안드로이드 OS가 있으며, 대부분의 스마트폰과 태블릿 PC들이 이 두 OS 중 하나를 기반으로 하여 동작을 하도록 설계되어 있다. 그리고 이러한 스마트기기 사용의 증가는 시간 및 장소의 제약을 줄이는 사회 환경의 변화로 이어지고 있다. 그러나 이런 발전이 우리에게 편의성만을 제공하고 있지는 않으며, 오히려 과거에 비해 더욱 쉽고 빠르며 심지어 자신이 알지도 못하는 사이에 중요 정보를 유출할 수도 있고 금전적 피해로도 이어지고 있다. 대표적으로 초기의 피싱, 파밍에 이어 현재의 스미싱과 이를 변조한 큐싱 등 다양한 공격을 통해 금전적 피해 및 심각한 정보 유출 등이 발생하고 있다. 이에 본 논문에서는 스미싱 공격을 기술적으로 탐지 및 차단할 수 있는 대응체계를 제안하고, 제안한 방법으로 스미싱 공격을 100% 탐지하여 기존의 탐지 방법과 비교하여 성능이 우수함을 보였다. Since 2009 the number of users of smart phones and tablet PC is growing exponentially. In particular Apple's iOS and Google's Android OS are the heart of this remarkable growth, most of smart phone and tablet PC are designed to operate based on these two OS. Such increasing use of smart devices has led to changes in the social environment that allows, without the constraints of time and place. However, such development does not supply only ease to do something, even compared to past, financial fraud and information leakage are easier than before by variety of new types of attack for example phishing, pharming, smishing and qshing. So according to this paper, analyzes for smishing attack, propose a countermeasure system of the technical way and proved its higher performance compare to the existing method.

In this paper, we derive the average symbol error rate (SER) for the N-D-symbol burst hybrid adaptive decode-or-amplify-forward (HADF) relaying vehicle-to-infrastructure (V2I) communication systems over quasi-static independent and non-identical distributed (INID) Rayleigh fading channels. Our proposed analytical approach includes channel estimation (CE) errors generated by practical pilot symbol assisted-CE (PSA-CE) schemes. Firstly, based on the error-events at relaying on board equipments (OBEs) for N-D-symbol burst data transmission, the conditional SER expression has been derived as an exact form. Then, the approximated average SER (ASER) expressions are presented as the closed-forms and their accuracy is confirmed by the comparison with simulation results. Therefore, we can conclude that our analytical expressions are tractable forms, and can be used as a tool to verify effects of an erroneous detection and hybrid transmission at each relaying OBE on the combined signal-to-noise ratio (SNR) and ASER for cooperative HADF relaying communication systems.

In this paper, we propose the average outage probability expressions for adaptive decode-and-forward (ADF) relaying schemes based on burst transmission over quasi-static Rayleigh fading channels. The derived analytical approach is verified based on the number of relays and data symbols. Its accuracy is confirmed by comparison with simulation results.