Code Rate Estimation Algorithm for BPSK Signal Based on Wavelet Transformation

A wavelet transformation based estimating algorithm for the symbol rate of BPSK signals is adopted . This method extracts baseband signal from the generated BPSK modulated signal by means of different ways, utilizing the modulus of wavelet transformation coefficients of this baseband signal to construct a singular pulse sequence consistent with the code rate of original modulated signal. Theoretical analysis on the power spectrum of this singular pulse sequence indicates that there exist discrete spectral lines in the integral multiples of baseband signal symbol rate, thus detecting these discrete spectral lines can achieve the estimation of signal symbol rate. Our proposed algorithm can estimate the signal symbol rate under the low SNR condition.

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A Symbol Rate Blind Estimation Algorithm of Baseband Signal

Proceedings of the 2014 International Conference on Information, Business and Education Technology ◽

10.2991/icibet-14.2014.43 ◽

2014 ◽

Author(s):

Yuexuan Liu ◽

Jiangang Wang ◽

Xiaohui Li ◽

Longxing Tang ◽

Yuehuai Ma

Keyword(s):

Estimation Algorithm ◽

Blind Estimation ◽

Baseband Signal ◽

Symbol Rate

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A Novel Symbol Rate Estimation Algorithm for Phase Modulating Signals in Wireless Communications

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.443.392 ◽

2013 ◽

Vol 443 ◽

pp. 392-396

Author(s):

Peng Zhou ◽

Chi Sheng Li

Keyword(s):

Signal To Noise Ratio ◽

Estimation Algorithm ◽

Frequency Resolution ◽

Phase Shift Keying ◽

Phase Jump ◽

Rate Estimation ◽

Awgn Channel ◽

Symbol Rate ◽

Shift Keying ◽

Simulation Results

In this paper, we proposed a new symbol rate estimation algorithm for phase shift keying (PSK) and qua drawtube amplitude modulation (QAM) signals in AWGN channel First we constructe a delay-multiplied signal, from which we obtaine the modulated information. Then we calculated the instantaneous autocorrelation of the delay-multiplied signal to pick out the phase jump. To eliminate the restriction of frequency resolution in fast Fourier transform, we performed a Chirp-Z transform to find out the exact spectral line which represente the symbol rate of the signal to be analyzed. Compared with the existing algorithms, it is a simple solution that has a better performance and accuracy in low signal-to-noise-ratio channel conditions. Simulation results show that the probability of relative estimating deviation below 0.1% reaches 100% and the average and standard variance of absolute estimation deviation are at the magnitude of 10-2 when SNR is over 2dB.

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Simultaneously constraining the astrophysics of reionisation and the epoch of heating with 21CMMC

Proceedings of the International Astronomical Union ◽

10.1017/s1743921317011103 ◽

2017 ◽

Vol 12 (S333) ◽

pp. 18-21 ◽

Cited By ~ 3

Author(s):

Bradley Greig ◽

Andrei Mesinger

Keyword(s):

Parameter Estimation ◽

Theoretical Analysis ◽

Power Spectrum ◽

Light Cone ◽

Theoretical Modelling ◽

Next Generation ◽

One Step ◽

Foreground Removal ◽

Spectrum Amplitude

AbstractWe extend our MCMC sampler of 3D EoR simulations, 21CMMC, to perform parameter estimation directly on light-cones of the cosmic 21cm signal. This brings theoretical analysis one step closer to matching the expected 21-cm signal from next generation interferometers like HERA and the SKA. Using the light-cone version of 21CMMC, we quantify biases in the recovered astrophysical parameters obtained from the 21cm power spectrum when using the co-eval approximation to fit a mock 3D light-cone observation. While ignoring the light-cone effect does not bias the parameters under most assumptions, it can still underestimate their uncertainties. However, significant biases (∼few – 10 σ) are possible if all of the following conditions are met: (i) foreground removal is very efficient, allowing large physical scales (k ∼ 0.1 Mpc−1) to be used in the analysis; (ii) theoretical modelling is accurate to ∼10 per cent in the power spectrum amplitude; and (iii) the 21cm signal evolves rapidly (i.e. the epochs of reionisation and heating overlap significantly

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Study of opacity broadening in spectral lines for helium like ions in aluminum plasma which produced by laser

Baghdad Science Journal ◽

10.21123/bsj.8.1.54-58 ◽

2011 ◽

Vol 8 (1) ◽

pp. 54-58

Author(s):

Baghdad Science Journal

Keyword(s):

Theoretical Analysis ◽

Spectral Line ◽

Quantum Number ◽

Plasma Density ◽

Energy Levels ◽

Spectral Lines ◽

Aluminum Plasma

A theoretical analysis studied was performed to study the opacity broadening of spectral lines emitted from aluminum plasma produced by Nd-YLF laser. The plasma density was in the range 1028-1026 )) m-3 with length of plasma about ?300) m) , the opacity was studied as function of plasma density & principle quantum number. The results show that the opacity broadening increases as plasma density increases & decreases with the spacing between energy levels of emission spectral line.

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