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The most crucial problem in navigation system is localization. The global positioning system (GPS) has long been used in mobile unit localization. However, GPS is incapable in some situation such as indoor environment. The received signal strength indicator (RSSI) from wireless communication is a promising alternative method to derive the location of a mobile unit. To improve the precision and robustness...
Full-Duplex radio provides many benefits beyond improving spectral efficiency. However, canceling the self-interference completely is a big challenge behind Full-Duplex wireless. Although many intelligent efforts devote to active analog radio frequency self-interference cancellation (AARFSIC), the power of the residual self-interference (SI) after the AARFSIC is still much stronger than that of the...
The physical layer security technology is an effective way to reduce information leakage in a wireless communication system. In this paper, we study the physical-layer security of one-way wiretap channel which contains a source-destination pair, an eavesdropper and multiple cooperating relay nodes. What's more, in this channel, there exists direct link between the source and the destination (eavesdropper)...
Non-Coherent receivers are attractive for IR-UWB systems and are preferred over its coherent counterpart, because of its implementation simplicity and non-requirement of channel state information (CSI). UWB systems have a low Power Spectral Density (PSD) which limits it from achieving a wide coverage and high data rate despite, providing an adequate system performance. Hence, cooperative diversity...
Overlapped FFT based energy detection has been proposed as a signal detection scheme in dynamic spectrum access. The overlapped FFT scheme increases the number of FFT frames to reduce the variance of squared noise and improves the detection performance. As the FFT frames are overlapped, correlation values between the frames affect to the detection performance. This paper proposes the window functions...
In recent years, wireless positioning technologies have been widely considered in the developments of new telecom systems and services. The increasing requirements of location-based services (LBS) in many practical applications have promoted the investigations of location estimation methods. With the system models and network structures addressed in the technical reports of 3GPP, the geometry-improved...
In this paper, we propose a space-time block coded (STBC) amplify-and-forward cooperative (STBC-Co-AF) relay which requires no knowledge of CSI at relay station (RS). In STBC-Co-AF relay, the source node transmits 2-block signal to both RS and the destination node in the first time slot and then, RS transmits amplified STBC-coded signal to the destination node in the second time slot. The destination...
Smart home and Internet of Things (IoT) are recently drawing attention as the next-generation concept for home appliances. Inexpensive wireless communications technologies for connecting appliances to have enhanced capability and service will be important. This paper proposes the Inaudible Dual Tone Data transmission (IDTD) method, which can be applicable to them based on built-in speakers and microphones...
In this paper, an algorithm for energy efficiency optimization is designed in a point-to-point narrowband Multiple-Input Single-Output (MISO) system with Simultaneous Wireless Information and Power Transfer (SWIPT). Power splitting architecture is assumed for the receiver, which would split the received Radio Frequency (RF) signals into two independent streams for information decoding and energy harvesting,...
In this paper, we propose an opportunistic user selection criterion to obtain a multiuser diversity gain for secure communication. At the same time, we also propose a strategy for utilizing a small base station in heterogeneous networks as a helper or a jammer adaptively. Our approach is to maximize the secrecy achievable rate based on an analytically derived lower bound instead of the original objective...
Surgical resection of epileptogenic foci is often a beneficial treatment for patients suffering debilitating seizures arising from intractable epilepsy [1], [2], [3]. Electrodes placed subdurally on the surface of the brain in the form of an ECoG array is one of the multiple methods for localizing epileptogenic zones for the purpose of defining the region for surgical resection. Currently, transcutaneous...
This paper presents a novel dual slope charge sampling (DSCS) analog front-end (AFE) architecture, which amplifies neural signals by taking advantage of the charge sampling concept for analog signal conditioning, such as amplification and filtering. The presented DSCS-AFE achieves amplification, filtering, and sampling in a simultaneous fashion, while consuming very small amount of power. The output...
Near-infrared spectroscopy (NIRS) is a relative new technology in monitoring muscle oxygenation and hemo-dynamics. This paper presents a portable multi-channel wireless NIRS device for real-time monitoring of muscle activity. The NIRS sensor is designed miniaturized and modularized, to make multi-site monitoring convenient. Wireless communication is applied to data transmission avoiding of cumbersome...
Many experiments in neuroscience require or would benefit tremendously from a wireless neural recording system. However, commercially available wireless systems are expensive, have moderate to high noise and are often not customizable. Academic wireless systems present impressive capabilities [1]-[4], but are not available for other labs to use. To overcome these limitations, we have developed an...
Wireless Capsule Endoscope (WCE) provides a noninvasive way to inspect the entire Gastrointestinal (GI) tract, including large intestine, where intestinal diseases most likely occur. As a critical component of capsule endoscopic examination, physicians need to know the precise position of the endoscopic capsule in order to identify the position of detected intestinal diseases. Knowing how the capsule...
This paper is concerned with the secure MIMO transmission in a classic three-node network, in which both the transmitter (Alice) and the receiver (Bob) simultaneously send artificial noise (AN) to impact the channel of the eavesdropper (Eve). Only statistical information about the eavesdropper channel is available. Compared to previous works, this paper studies the scenario in which the main channel...
With low Peak to Average Power Ratio (PAPR) and robustness of the multiple carrier, SC-FDMA has become the uplink scheme of many wireless systems. Comparing with the Frequency Domain Linear Equalizer (FD-LE), the Decision Feedback Equalizer (DFE) can eliminate more Inter Symbol Interference (ISI) which is the residual of the FD-LE in SC-FDMA system. But the error propagation has degraded the performance...
This paper presents a power-supply noise canceller (PSNC) for current-steering DAC for high-speed and high-throughput wireless communication systems. Proposed PSNC effectively detects power-supply noise (PSN) and controls the current sources so that PSN would be removed at the output signal. The fabricated 2.24-GHz, 6-bit DAC has demonstrated a maximum of 8.4-dB PSN-reduction. Also, this DAC achieved...
A space time code based partial rank affine projection (PRAP) algorithm is proposed. The proposed algorithm uses an input signal where the input signal matrix Xk becomes an orthogonal matrix. For this input signal, matrix (XkTXk) becomes a diagonal matrix whose inverse can be easily computed. Thus, the proposed algorithm saves a significant amount of computations. Due to this feature the proposed...
Recently, compressive sensing (CS) algorithms have been adopted to improve the accuracy of channel estimation for wide-band wireless communication systems. Since the wireless channel is usually time and frequency doubly selective fading, the performance of CS based channel estimation is limited by the estimation accuracy of the channel's sparsity level. In this paper, an adaptive subspace pursuit...
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