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This paper proposes a reliable MAC protocol for a fully distributed Vehicular Ad-Hoc Network (VANET) using the slot states sharing scheme. Recently, technology for reliably transmitting safety messages in VANET has become an issue. With VANET (operating on the IEEE 802.11p standard), as the number of vehicles increases on the highway, the network traffic also increases. It causes more frequent packet...
This paper considers a fast fading wireless powered wiretap channel, where an energy constrained information source, powered by a dedicated power beacon, sends a secret message to a legitimate user using the artificial noise (AN) scheme in the presence of a passive eavesdropper. Based on a two-phase time division protocol, the ergodic secrecy throughput is derived. Furthermore, the optimal time-switching...
Recognizing the location of an individual in a home environment is crucial in order to enable various context-aware home applications such as elderly health monitoring and in home appliance automation. However, due to the limited number of dedicated Wi-Fi access points (APs), it is challenging to guarantee the reliable localization performance in a home environment by using the traditional Wi-Fi fingerprinting...
This paper proposes a novel scheme of Multi-carrier Index Keying — Orthogonal Frequency Division Multiplexing (MCIK-OFDM), called as repeated MCIK-OFDM (ReMO), which is capable of improving the error performance compared to classical MCIK-OFDM for a given spectral efficiency. Similar to the classical MCIK-OFDM, ReMO activates only a subset of sub-carriers to carry information bits by the use of both...
In this paper, we consider a cellular network, where a macro BS serves a single user with the aid of helper nodes, and find the optimal way to save a file in the helper nodes. Storing a file into distributed storage affects both hitting probability and successful recovery of the data at a user. With MDS coding, cache equipped helper nodes can store small fragments to improve the hitting probability...
Conventional mobile computation offloading relies on offline prefetching that fetches user-specific data to the cloud prior to computing. For computing depending on real-time inputs, the offline operation can result in fetching large volumes of redundant data over wireless channels and unnecessarily consumes mobile-transmission energy. To address this issue, we propose the novel technique of online...
An efficient, optically invisible antenna applied on the touch OLED display panel is presented and demonstrated for the first time in literature. A transverse magnetic (TM01) patch antenna is devised at 2.45 GHz on the display panel surface of a real-life smartwatch device and its radiation properties, optical visibility and touch functions are investigated.
This paper presents the close-form expression of the spatial security outage probability, which is a novel performance metric that measures the security level of the legitimate transmission from the spatial aspect in the presence of Poisson Point Process distributed eavesdroppers. Beamforming is used to create the exposure region where any randomly located eavesdropper causes secrecy outage, based...
This paper presents a lightweight video sensor node for moving object surveillance using region-of-interest (ROI) based coding and an on-line multi-parameter rate controller. The proposed ROI-based coding scheme determines ROI blocks, pre-processes non-ROI blocks using bit-truncation, and encodes all blocks using Motion JPEG. The on-line rate controller modulates the parameters of the ROI-based coding...
We propose a new selective multi-carrier index keying in orthogonal frequency division multiplexing (OFDM) systems that opportunistically modulate both a small subset of sub-carriers and their indices. Particularly, we investigate the performance enhancement in two cases of error propagation sensitive and compromised device-to-device (D2D) communications. For the performance evaluation, we focus on...
We consider the problem of providing continuous wireless connectivity to mobile Wi-Fi users via a mobile access point (MAP). In traditional infrastructure Wi-Fi networks, mobile users may experience poor or no connectivity when they are away from an access point (AP) and/or there is an interfering obstacle in between. The connectivity is affected by the factors such as type of data traffic (like interactive,...
We have proposed a prioritized random access (PRA) scheme, where each node indicates its access priority by differentiating the transmit power of preamble signatures and the eNodeB utilizes multiple detection thresholds to detect the prioritized preamble signatures. In this paper, in order to make the PRA scheme more robust, we enhance our previously proposed PRA scheme by investigating the effect...
In this paper, we proposed data communication method based on inaudible sound which the most people cannot listen to at near field. The proposed method can transmit some bits data as using mixed high frequencies which are mapped at each data bit. Besides, the proposed method increases the accuracy of data transmission as using cyclic redundancy check for prevention of transmission error. To evaluate...
In this paper, we proposed data communication method based on inaudible sound which the most people cannot listen to at near field. The proposed method can transmit some bits data as using mixed high frequencies which are mapped at each data bit. Besides, the proposed method increases the accuracy of data transmission as using cyclic redundancy check for prevention of transmission error. To evaluate...
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,...
The measurement system for healthcare signals such as heart rate and body temperature is significantly important to prevent and monitor of potential heart attack. Although numerous researchers have developed wearable devices and systems, there are still lots of issues to be solved to expand their applications. To overcome such issues, we propose the new types of healthcare-on-a-patch using flexible...
In this paper, we show the effect of phase noise on the bit-error rate performance in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems based on IEEE 802.11ad standards. We consider two different systems; (1) a system which has multiple antennas with independent phase noise at transmit and receive side and (2) a system which has coherent phase noise from...
This paper proposes an OFDM system to be used in the ECG Patient Monitoring System (ECG-PMS) for wireless telemedicine applications. The system needs a level of transmitted power at the patient site, and achieves a high BER performance at the hospital base station. This achieved by implementing a wavelet-based OFDM system that uses channel estimation based on the improved Data-Aided technique called...
Dysphagia is a common complication of strokes, and the patients usually have clinical problems such as malnutrition, significant weight loss, and aspiration pneumonia. Measuring the muscle activity pattern to describe physiology of swallowing behavior by surface electromyography (sEMG) is a simple, non-radioactive, and non-invasive method. Most of previous studies described the swallowing behavior...
Beacon allows Bluetooth [1] devices to broadcast and receive tiny information within short distance, which consists of two parts: a broadcaster (beacon device) and a receiver (smartphone app). So, it is being widely used in URL (Uniform Resource Locator) broadcast, distance measurement, localization etc. However, because of its deviation, measured distance value is not always accuracy. In this paper,...
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