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Most of the physical-layer authentication methods are based on the pre-knowledge of the channel information and the threshold is fixed before the communication process. In this paper, we propose a physical layer authentication method based on channel information and machine learning with a dynamic threshold in wireless communication environment. In this method, the threshold of the channel differences...
Quadrature Amplitude Modulation (QAM) is a high spectrum-utilized modulation scheme which is used extensively in digital microwave communication system. However, in QAM-based system, it is challenging to design a digital receiver with high data rate to detect signal, correct symbol-timing, and synchronize carrier effectively. In this paper, we propose a new parallel, all-digital based receiver for...
Evolution of modern communications and radar systems have steadily increased the demand on modelling the propagation effects with real world scenarios for various signal types. The main purpose of this research is to create a flexible, generic and realistic Radio Frequency (RF) environment simulator including both radar and communication signals. Software defined radio (SDR) platform has been utilized...
Intermediate coils are used in wireless power transfer to improve system performance, such as power transfer capability and efficiency. However, they can have adverse effects if used improperly. This paper focuses on the coil coupling stage of three-coil series-compensated wireless power transfer systems and analyses the effects of the intermediate coil under different conditions. When the coupling...
Conventional decision feedback equalizers (DFEs) suffer from the fundamental drawback of shrinking rather than increasing data eyes when consecutive 1s or 0s are present in data. To combat this drawback, a new data-transition adaptive DFE is proposed. The proposed DFE takes into account the dependence of post-cursors on the polarity of data and searches for optimal tap coefficients using a sign-sign...
This paper presents a bit-level parallel communication interface used for inter processor communication separated on different printed circuit boards. A high performance board-to-board communication interface is important in modern supercomputers and portable computers or gadgets with multiple screen displays. We propose a recalibrated transmitter and receiver soft IP cores to support asynchronous...
This paper investigates the performance of a cooperative spectrum sharing protocol for cognitive two-way amplify-and-forward (AF) relaying system. In the proposed framework, two primary users (PUs), PU1 and PU2 coexist with a secondary user (SU) in the same frequency band albeit with different priorities. Primary users by virtue of having a license to operate over the frequency band have higher priority...
Ultra-wideband (UWB) signal offers high time resolution and precise time of arrive (TOA) estimation. But it requires extremely high sampling rate analog to digital conversion (ADC). To handle this problem, Compressive sampling (CS) theory has been used in UWB system to localize objects at a sampling rate much below the Nyquist rate. In this paper, we utilize Bayesian Compressive Sensing (BCS) to UWB...
New Raptor codes, based on low rate low-density parity-check (LDPC) codes, are proposed for short message length over various channels. The proposed Raptor codes are obtained by pre-coding the information bits by low rate LDPC codes and utilizing a low constant average degree distribution with high intermediate symbol recovery rate (ISRR). Simulation results demonstrate that the proposed Raptor codes...
In this paper, we investigate the impact of different parameters on channel characteristics in a high-speed train (HST) ray tracing tunnel channel model. Signal propagation in HST tunnel scenarios differs much from that of other HST scenarios due to the unique construction of tunnels. Ray-tracing method is applied to analyze the received power and power delay profile (PDP) of tunnel channel models...
This paper presents novel circuit techniques to implement DDR I/O circuit design that can support multiple low-power standards in a state-of-art 7nm CMOS finfet process. Hybrid pull-up driver with a power gating switch is proposed to support a wide range of data rates and output swing levels. The usage of both thin and thick gate oxide devices in the final output stage effectively achieves minimal...
In this work, we leverage the reflection property explored in our experimental results and propose an efficient and effective algorithm for the reconstruction of the layout. The proposed algorithm identifies the reflective path, which is caused by obstacle, and evaluated by the difference of Angle of Arrival (AoA) at each transceiver deployed at the room. Then with the knowledge of AoA corresponding...
This paper formulates the maximum RF-to-RF efficiency of inductive power transfer system with two transmitters and two receivers under the assumption that cross-coupling exists between transmitters and between receivers. Maximum efficiency is derived by jointly optimizing the input and output currents. We express the maximum efficiency by a system kQ-product, which is determined by system Z-parameters...
In this paper, a cooperative device to device (D2D) communication system is studied while two transmitting devices communicate with one destination device in the presence of a passive eavesdropper. The second transmitting device cooperates with the first transmitting device and hence the transmission takes place is two phases. In the first phase, the first device transmits its signal to the second...
The performance of the systems which based on wireless signals such as localization system relies mostly on the propagation model. Radio signals can be mainly difficult to model because the channel varies significantly with the environment such as indoors. This paper studies two popular propagation models for indoor environments. Practically, these models do not estimate the radio signal fading properly...
In this paper, we solve the optimizing problem of designing Low-Density Parity Check codes for two parallel erasure links based on the known SDP approach. We show that our reformulation is suitable for this optimizing problem. Our results show that the optimal rate code design problem is a good way and worth-mentioning tool. One can extend our work to the other area.
Bit error rate(BER) analysis of an L antenna equal gain combiner (EGC) in correlated composite fading channels and in independent and identically distributed (i.i.d) non-homogenous fading channels is evaluated in the presence of co-channel interference(CCI) and imperfect estimation of carrier phase. The nth moment of the combiner output signal to interference plus noise ratio(SINR) is derived individually...
Since it is challenging to position the noncooperative receiver (Rx), especially when the backward frequency band of the Rx cannot be obtained by the anchors. In this paper, we propose a novel noncooperative Rx positioning method using full-duplex relay technique, where the anchors act as full-duplex relays for the Rx. It can trigger the close-loop-power-control (CLPC) between the transmitter (Tx)...
In this paper typical approaches to mitigate single event effects using spatial redundancy were reviewed. The specificity of receivers input tracts were described. The low power techniques as the clock gating have a significant impact on the work conditions of a digital receiver. A novel modification was proposed for storage cells which are insensitive to radiation-induced single event upsets such...
In order to overcome the major implementation problem of long delay line requirement in the conventional transmitted reference (TR) signaling, transmitted reference pulse cluster (TRPC) structure was proposed and further developed for noncoherent ultra-wideband (UWB) systems. In this paper, weighted autocorrelation receiver (WAcR) is introduced for the TRPC system with hybrid binary phase shift keying...
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