Decode-and-forward physical layer network coding (PLNC) is one of the promising high-performance techniques for wireless relay networks. This study presents a channel and delay estimation algorithm along with a detect...
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Decode-and-forward physical layer network coding (PLNC) is one of the promising high-performance techniques for wireless relay networks. This study presents a channel and delay estimation algorithm along with a detection scheme for time-domain two-way relay network in Rayleigh block fading channels. Preambles are attached for frame-based synchronisation and channel estimation. Moreover, to achieve low-complexity estimation, the preambles are designed in Alamouti code structure. The Cramer-Rao bound (CRB) of the channel estimation is given, and simulations show that the mean-square error of channel estimation of the proposed scheme could reach the CRB. Compared with the traditional approach, the newly proposed combined scheme can achieve almost the same performance, but with significant improvement in computational complexity. At last, bit-error-rate performances analysis is given. Simulation validates the authors' analysis, and shows the upper bound and lower bound are tight.
With reference to linear time invariant fractionalorder systems, of both commensurate and non-commensurate type, a novel, gradient-based, procedure for the adaptive estimation of the delay parameter is presented in th...
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ISBN:
(纸本)9781479925919
With reference to linear time invariant fractionalorder systems, of both commensurate and non-commensurate type, a novel, gradient-based, procedure for the adaptive estimation of the delay parameter is presented in the current paper. The connections between the proposed delay estimation algorithm and a recently proposed technique for commensurate order estimation are highlighted and discussed. The algorithm is supported by an appropriate Lyapunov-based stability analysis providing sufficient convergence conditions. Simulation examples are presented to show the correct functioning of the scheme.
This letter proposes a novel time delayestimation method based on sparse optimisation of the cross-correlation function to improve the estimation accuracy of delay parameters of chirp signals in multipath environment...
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This letter proposes a novel time delayestimation method based on sparse optimisation of the cross-correlation function to improve the estimation accuracy of delay parameters of chirp signals in multipath environments. In this method, the time delayestimation model is converted into a correlation-function based model to estimate the parameter of exponent signals with frequency information, and the covariance matrix of such correlation function is solved by a sparse iteration optimisation algorithm abbreviated as CCF-SPICE. Experimental simulations show that the proposed delay estimation algorithm has a sharper peak with less power leakage compared with the existing SPICE algorithm. Its performance is better than the SPICE algorithm and conventional MUSIC algorithm, especially under low SNR in multipath environments. The MSE performance of the proposed CCF-SPICE algorithm is closer to Cramer-Rao bounds.
For ultra wide band impulse signal direction of arrival estimation, conventional wide band algorithms need to divide the wide band frequency into narrow band bins, but the time width of an impulse is about a nano seco...
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ISBN:
(纸本)078039335X
For ultra wide band impulse signal direction of arrival estimation, conventional wide band algorithms need to divide the wide band frequency into narrow band bins, but the time width of an impulse is about a nano second and the collected signal duration to do Fourier transform is about a few nano seconds, does the frequency resolution satisfy the narrow band condition? We show that the narrow band assumption also hold. We also obtain the signal noise ratio loss when only one frequency bin data is used to do DOA estimation. When impulse waveform is known, a subspacebased high resolution joint DOA delay estimation algorithm is obtained.
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