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The paper is aimed at the determination and verification of system parameters, that can be achieved with the utilization of commonly available RTL-SDR software defined receiver in TDOA based system intended for position determination of the small-UAS. The paper describes a way of performing practical experiments, measurement setup and properties of the signal used. Experimental results lead to the...
Recently, electromagnetic interference in AM radio receivers associated with noise generated from the power control unit (DC-DC converters/inverters) and other power electronics devices, such as an electric power steering (EPS) control modules, in hybrid vehicles (HVs) has become a serious problem. In order to address this problem, most noise suppression methods use either noise filters (for noise...
Pseudo-Noise (PN) code synchronization is of crucial for receiver in direct sequence spread spectrum (DSSS) communication. What's more, acquisition and tracking are two important parts of the synchronization process. To meet the need of a lower power consumption and higher performance, there is a trend to design the digital match filter by using the field programmable gate array (FPGA) or the application...
We consider the single user detection of signal in the spread spectrum communication system used for high mobility applications. Due to the complexity of initial phase estimation differential phase shift keying (DPSK) is employed. The performance of the linear correlation algorithm and the sign algorithm in the presence of additive Gaussian noise, multipath interference and high power external interference...
In this paper, we propose a precorrelation direction lock loop (DiLL) scheme and a new modification factor estimation method for the global navigation satellite system (GNSS) receivers. The proposed scheme executes spatial correlation before code demodulator and does not need to do code demodulation for every antenna element. It can decrease the number of code demodulator to 3 regardless of the array...
Low-power, low received signal-to-noise-ratio (SNR) signals have potential for reducing the impact on marine life from acoustic communications. Here we explore the use of bandlimited pseudo-noise m-ary orthogonal code keying (MOCK) scheme using m-sequences. Analysis and simulation of receiver structure for synchronisation and data demodulation performance is carried out. Performance of M-OCK is compared...
In this paper 1 we discuss the design issues of an Ultra Wide Band (UWB) receiver, targeting a single-chip CMOS implementation for low data-rate applications like ad hoc wireless sensor networks. A non-coherent transmitted-reference (TR) receiver is chosen because of its small complexity compared to other architectures. Issues, challenges and possible design solutions are discussed. In particular,...
Broadcast preamble such as the P1 symbol in DVB-T2 carries signalling to inform the receivers of the transmission mode and ease initial synchronization. However, all the existing preamble schemes based on the channel correlation of adjacent frequencies may fail to work in practical channel conditions. In this paper, we propose a preamble scheme for OFDM broadcast system, exploiting the correlation...
Recently, there has been a shift from analog to digital wireless communication systems among those used for wireless communication systems. Promotion of the digitization of wireless communication systems has drawn attention to direct-conversion (DC) receivers as means of reducing the cost of digital wireless communication equipment. In this paper, we propose an algorithm for estimating and compensating...
PLL, DLL and data demodulator are key components in a GNSS receiver. Basing on the parameters of widely-used hardware, this paper calculates the noise performance of data demodulator and input SNRs of PLL and DLL. The phase models of GNSS receiver's carrier-tracking loop and code-tracking loop with thermal noise are also established. Then the loop SNRs(Signal to Noise Ratio)of carrier-tracking loop...
In this paper, we propose a low-complexity data-aided (DA) synchronization and efficient demodulation technique for an ultrawideband (UWB) impulse radio system. Depending on the autocorrelation property of a judiciously chosen training sequence, a redundance-included demodulation template (RDT) can be extracted from the received signal by separating, shifting, and realigning two connected portions...
Dual component systems share energy to optimize tracking and data-down-load, but usually omit acquisition considerations. This paper proposes a new concept that makes all the energy available for pilot, all available for tracking and download, but vastly enhances acquisition sensitivity and TTFF.
This article presents a methodology related to the computation of civil aviation acquisition, tracking and data demodulation thresholds adapted to the case of Galileo E1 OS/SoL signal. These thresholds are compared against worst case link budgets representing operational scenarios. It is shown that these thresholds provide a positive margin although these theoretical results would probably require...
The implementation of BOC ambiguity resolution has been tested and provides low false lock probability in realistic conditions. Possible improvements and robustification are proposed for future implementation.
This article presents results of tests on real signal of a method of positioning using a digital TV DVB-T signal-of-opportunity which is based on an OFDM modulation. OFDM and DVB-T standard are presented and the positioning method using the DVB-T signal is detailed. The result on real signal are analyzed qualitatively and quantitatively in static and dynamic scenarios and indoor and outdoor environments...
This article proposes a new method of maintaining synchronization of carrier for the correlation receiver. We use PSK of fifth phase for this telecommunication system. However, we can apply this method for the correlation receiver of any other demodulation. As usual method for the synchronization, there is DLL (Delay Lock Loop). However we thought that we can directly find the value of phase difference,...
The IEEE has proposed a narrowband PHY for the IEEE standard of wireless body area network. To maintain small phase transition of the π/2-DBPSK modulated signal and ensure simple receiver design, repetition code is used where lower data rate is needed. In this paper, we suggest to replace the repetition code by Walsh code to improve the interference cancelation capability of the system. Spreading-before-modulation...
The first stage of the signal processing chain in a Global Positioning System (GPS) receiver is the acquisition, which provides for a desired satellite coarse code phase and Doppler frequency estimates to subsequent stages. Thus, acquisition is a two-dimensional search, implemented as demodulation and non-coherent correlation. For a certain Doppler estimate, software-defined GPS receivers typically...
This article proposes a new method of maintaining synchronization for the correlation receiver. I use PSK of fifth phase for this telecommunication system. However, we can use this method for the correlation receiver of any other demodulation. As usual method for the internal synchronization, there is DDL (Delay Lock Loop). But I thought that we can directly calculate the value of phase difference,...
In a soft decision Viterbi decoder, the log-likelihood ratio (LLR) metric is used to improve the performance of the error correction. However, this cannot be directly applied in frequency shift keying (FSK) wireless transmission system which uses a frequency discriminator for FSK de-modulation - an inherently non-linear circuit. The LLR for a linear system cannot be used for the FSK wireless transmission...
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