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The method of compressive sensing is applied to moving source data created by simulation to estimate the mode wavenumbers, mode depth functions and mode amplitudes without any environmental acoustic information, such as sound speed profile or bottom properties. The method needs in principle only data covering a short range span and is thus applicable to a range-dependent environment to estimate the...
This paper proposes a localization method for wireless sensor nodes that utilize tri-directional coils for near-field magnetic induction (MI) communications. Taking advantage of magnetic field measurements of the tri-directional coils, the proposed localization algorithm uses only two anchor nodes to locate a sensor node in the 3-D space. Assuming each anchor node sequentially transmits the communication...
In this paper we present a proof-of-concept for an hydro acoustic fish-tag position estimation and tracking system. In our field-tested concept, a formation of Unmanned Surface Vehicles (USV) creates a mobile array of low-cost hydro acoustic fish-tag receivers. The array of receivers is able to estimate fish-tag locations and follow the fish on open waters, significantly increasing capabilities as...
In this paper, we present the baseband receiver design for IEEE 802.11ah. We study several key receiver algorithms, including coarse frequency offset estimation and coarse timing synchronization, fine frequency offset estimation, fine timing synchronization, channel estimation and MIMO equalization. For channel estimation, we propose to use decoded SIG field to improve its estimation. To further improve...
Multilevel polarization shift keying (MPolSK) is an optical modulation scheme, in which the state of polarization changes according to transmission data. When either the transmitter or the receiver is not fixed, the mismatched polarization axes is caused. It significantly degrades the communication performance. To overcome this problem multilevel differential PolSK (MDPolSK) was proposed, in which...
The carrier frequency offset(CFO) in OFDM system is one of the key factors that affect the performance of wireless communication. Based on the analysis of the CFO estimation algorithm, this paper presents FPGA implementation scheme in the problem of OFDM fractional CFO estimation using pilot-based algorithm, including CFO estimation and CFO compensation. The circuit modules in the program were written...
Signal source localization and separation are key tasks for many applications. In this paper, a new deterministic method is proposed for estimating the 3D location and separating multiple acoustic or vibration sources, simultaneously active. The method is based on TDOA measurements obtained via crosscorrelation. Then, with the information from the estimated locations, source separation is achieved...
In this paper, we show some experimental results of a proposed distance estimator based on the received signal strength indicator. We provide a fact that the proposed estimator outperforms the conventional one with respect to a theoretical analysis, computer simulations and experimental results.
Although a number of asynchronous physical-layer network coding (PNC) schemes have been proposed, synchronous PNC may still be preferred for its simplicity. In this paper we propose a new symbol-level synchronization scheme which reduces the misalignment to less than one hardware clock cycle period. In addition, we prototype the proposed scheme on the Universal Software Radio Peripheral (USRP) platform...
In this paper, an adaptive error concealment method is proposed to recover the motion vectors of degraded macroblocks (MBs) in a frame, based on analyzing the behavior of the MBs in the frames. In this method, the behavior of the degraded MB is first estimated considering the obtained information from motion vectors of neighboring MBs in the current frame and collocated MBs in the previous frames...
Based on thorough analyses of adverse effects from nonlinear distortion caused by high power amplifiers (HPAs) with phase conversion in multiple-input multiple-output space-time block code (MIMO-STBC) systems, this work proposes a nonparametric phase estimation and compensation method for the received signal. Using the optimal feedforward blind estimation technique, the receive signal's rotated phase...
A joint radar-communication (JRC) system can provide cost-effective and spectrum-efficient platform solution with simultaneous operation, while accomplishing important tasks, sensing via radar processing and allocation of communication links. Existing modulation techniques where information embedding is achieved using sidelobe Amplitude-Shift Keying (ASK) for the JRC system are not investigated so...
Rapid and random temporal fluctuations in amplitude and phase of signal caused when GNSS signals are propagating through irregularities in electron density of the ionosphere are called amplitude and phase scintillation. Ionospheric scintillation can degrade receiver tracking performance, and in extreme cases, out of lock entirely. The elfect of amplitude scintillation on the signal is similar to that...
V2X technology provides communication services between a vehicle and networks, vehicles, and pedestrians. Especially, LTE based V2X is one of the emerging technologies in communications and automotive industries. To transmit and receive safety message among vehicles with V2X communication, new physical frame structure and receiver algorithm are introduced in 3GPP standardization. In particular, V2X...
Generalized frequency division multiplexing (GFDM) with the flexible structure is one of the promising candidates for the fifth generation wireless communication system. This paper focuses on training sequence design that is used in the estimation of in-phase(I) and quadrature(Q) imbalance parameters on GFDM receivers as well as frequency selective channel. Combining with the structure of low complexity...
In this paper, the authors proposes a easy calibration of DOD-based BLE beacon system for an indoor localization application. By the proposed calibration method, we can easily recognize the orientation and location of the beacon even though the beacons are roughly installed. The method uses DOD calculated from RSSI of received beacon signals and sensor information of the mobile handset for calibration...
A model-independent method of the range localization for a moving source using a single receiver is derived. The Demon (detection of envelope and modulation on noise) spectrum demodulated from the broadband noise of the vessel is obtained by the absolute low pass demodulation technology. A relationship between the range interval and the difference between the acoustic field at two different ranges...
This paper proposed a low probability of identification (LPID) radar signal parameter interval design method to control recognition probability in intercept receiver. The method introduced in this paper use identification capacity theory to study recognition process in intercept receiver. The relationship between identification capacity and error recognition probability is established. Then, the radiation...
In order to promote the popularization of BDS, the BDS / GPS dual-mode positioning is studied, and the pseudorange single point positioning algorithm of the dual-mode system is analyzed. On the basis of the least squares method, the weighted method is used to improve the accuracy of the positioning solution, and a fixed weight method combining the elevation angle model and posterior variance estimation...
We considered the range of PPP online services that solve the problem of high-precision coordinates and receiver time scale shift determination for the RINEX daily records. The comparative estimation of exact indicators of position determination for different geoids is given. The results contains the recommendations for use the online PPP services to solve the problem of time scales comparison.
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