Spread-Spectrum Continuous-Phase-Modulated Signals for Satellite Navigation

Emmanuele, Andrea; Zanier, Francesca; Boccolini, Gabriele; Luise, Marco

doi:10.1109/taes.2012.6324699

Cited by 32 publications

(22 citation statements)

References 11 publications

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“…e symbol signals used in the past are usually some simple empirical signal waveforms. For example, the application of rectangular waves in signals, such as quadrature phase shift keying modulation (QPSK) and offset quadrature phase shift keying modulation (OQPSK) and sine and cosine waves in the minimum shift keying signal (MSK) baseband modulation, have been used for the purpose of achieving a compressed band by a simple combined signal of the empirical waveform and by a filter [8][9][10][11][12]. e fourth-generation wireless communication uses OFDM as the basic modulation method, and rectangular signals are used as the baseband to transmit signals.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Analytic Solution and Numerical Solution of Baseband Symbol Signal Based on Optimal Generic Function

Liu

Xue

Makarov

et al. 2019

Mathematical Problems in Engineering

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In this paper, the optimal mathematical generic function model is established using the minimum out-of-band energy radiation criterion. Firstly, the energy limit conditions, boundary constraints, and peak-to-average ratio constraints are applied to the generic function model; thus, the analytical solutions are obtained under different parameters. Secondly, a single symbol signal energy constraint condition and boundary constraint condition are added to the generic function model; thus, the numerical solution of the different parameters is obtained. In the process of solving the analytical solution, the partial solution process is simplified to solve the analytical solution, and there are also digital truncation problems. In addition, the corresponding order of the Lagrange differential equation increases by a multiple of 2 when the parameter n increases, which makes the solution extremely complicated or even impossible to solve. The numerical solution is in line with the current development trend of digital communication, and there is no need to simplify the solution process in the process of solving the numerical solution. When the parameter n and the Fourier series m take different values, the obtained symbol signals can also meet the needs of different communication occasions. The relevant data of the above research process were solved by a MATLAB software simulation, which proves the correctness of the method and the superiority of the numerical method.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Analytic Solution and Numerical Solution of Baseband Symbol Signal Based on Optimal Generic Function

Liu

Xue

Makarov

et al. 2019

Mathematical Problems in Engineering

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“…Nowadays, CPM has been used in many areas such as global system for mobile communications (GSM) [4], military and satellite communications [5], millimeter communications [6], and machine-type communications in 5G [7], [8]. In dispersive channels, frequency-domain equalization (FDE) is needed to suppress the effect of intersymbol interference (ISI), followed Zilong Liu was with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.…”

Section: Introductionmentioning

confidence: 99%

CPM Training Waveforms With Autocorrelation Sidelobes Close to Zero

Liu

Guan

Chui

2018

IEEE Trans. Veh. Technol.

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Abstract-Continuous phase modulation (CPM) plays an important role in wireless communications due to its constant envelope signal property and tight spectrum confinement capability. Although CPM has been studied for many years, CPM training waveforms having autocorrelations with zero sidelobes have not been reported before, to the best of our knowledge. Existing works on CPM system design mostly assume that the channel fading coefficients are either perfectly known at the receiver or estimated using random CPM training waveforms. In this work, we propose a novel class of CPM training waveforms displaying autocorrelation sidelobes close to zero. The key idea of our construction is to apply differential encoding to Golay complementary pair having perfect aperiodic autocorrelation sum properties.

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“…In particular, for direct-sequence spread-spectrum (DS-SS) transmission schemes, the characteristics of the signaling waveforms affect several performance measures pertaining to bandwidth occupancy, multiuser interference, timing synchronization, and bit error performance. 4 Conventional waveforms were compared for DLL tracking circuits in previous studies, [5][6][7] while the impact of signal shaping on the physical layer performance under synchronization errors was addressed in Liu et al 8 Synchronization-oriented signal design for global navigation satellite systems (GNSS) can also be found in Zanier et al and Emmanuele et al 9,10 Other contributions in Zhang et al and Alhakim et al 11,12 analyzed the performance of modified DLL tracking circuits for time delay estimation of various DS-SS and ultra-wideband systems, and the effect of various fading models on DLL performance was analyzed in Wu and Tsai. On the other hand, the accrued multiaccess interference resulting from simultaneous asynchronous transmissions and consequently the system bit error performance strongly depend on signal waveform shaping as well.…”

Section: Introductionmentioning

confidence: 99%

Novel signals for optimized timing synchronization in direct‐sequence spread‐spectrum communication systems

Landolsi

2018

Int J Communication

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The paper presents design techniques for novel signaling waveforms to optimize timing synchronization in direct-sequence spread-spectrum communication systems. Both coarse code timing acquisition and fine delay-locked loop tracking systems are considered, and their performance metrics are analyzed in terms of initial acquisition detection probability and residual tracking jitter, showing a strong dependency on signal waveform spectral characteristics. Bit error performance under imperfect synchronization is also assessed. A design methodology is formulated with a low complexity parametric optimization approach based on prolate spheroidal waveform expansions for the generation of signals that minimize the probability of acquisition miss and tracking error jitter subject to additional constraints on signal energy and phase transitions. Novel optimized waveforms are synthesized with different levels of effective root mean square bandwidth occupancy and compared with conventional pulses to illustrate their advantages. Performance trade-offs are demonstrated between the acquisition and tracking systems, whereby signals with low effective bandwidth are found to have better acquisition capability at the expense of poorer tracking jitter, while the converse holds for signals with higher effective bandwidth. It is found that an effective root mean square bandwidth occupancy in the range of 40% to 50% of the chip rate can achieve a good compromise between the requirements of the 2 code timing synchronization phases. Numerical results are presented to quantify the relative merits of representative waveforms with respect to the different performance measures in terms of acquisition capability, tracking jitter, and bit error probability.

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Spread-Spectrum Continuous-Phase-Modulated Signals for Satellite Navigation

Cited by 32 publications

References 11 publications

Comparative Study of Analytic Solution and Numerical Solution of Baseband Symbol Signal Based on Optimal Generic Function

Comparative Study of Analytic Solution and Numerical Solution of Baseband Symbol Signal Based on Optimal Generic Function

CPM Training Waveforms With Autocorrelation Sidelobes Close to Zero

Novel signals for optimized timing synchronization in direct‐sequence spread‐spectrum communication systems

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