2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)
A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterio... more A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterion is proposed. The algorithm is carrier-phase independent and is designed for operation in burst-mode, narrow-band communication systems employing linear modulation. The accuracy of the proposed algorithm is assessed by simulation using QPSK signaling. The results show that the performance of the proposed synchronizer is very close to the
In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) f... more In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) for the variance of unbiased, data-aided (DA) symbol-timing estimates, obtained from a block of K samples of a linearly modulated information signal, transmitted through an additive white Gaussian noise channel with random carrier phase. We consider a carrier-phase-independent time-delay estimation scenario wherein the carrier
Power mains network is an attractive medium for data transmission with applications such as secur... more Power mains network is an attractive medium for data transmission with applications such as security monitoring, building control and remote meter reading. Due to the adversity of the medium non-conventional transmission techniques are used, in order to reduce interference in the network, providing feasible data communication. We propose a direct sequence spread-spectrum modulation system for transmission over the power mains
IEEE International Symposium on Circuits and Systems, 1999
A non-data-aided (NDA) feedforward symbol synchronizer for M-ary phase-shift keying (M-PSK) signa... more A non-data-aided (NDA) feedforward symbol synchronizer for M-ary phase-shift keying (M-PSK) signals based upon the maximum-likelihood (ML) criterion is proposed. The algorithm is well suited for burst-mode, narrow-band communication systems, offering significant improvement over other popular synchronizers. Although knowledge of the carrier phase is required (coherent synchronizer) the low variance of the estimates produced by this algorithm make it attractive
In this letter, we derive a new Miller-Chang lower bound (MCB) for the variance of unbiased non-d... more In this letter, we derive a new Miller-Chang lower bound (MCB) for the variance of unbiased non-data-aided (NDA) carrier phase estimates obtained from a block of N samples of a linearly modulated pulse-amplitude modulation or quadrature-amplitude modulation information signal, transmitted through an additive white Gaussian noise channel. This bound is tighter than the corresponding Crame´r-Rao lower bound (CRB) for data-aided or continuous-wave carrier phase estimation (CW-CRB), particularly when N is small. For some given N and sufficiently high signal-to-noise ratios, the MCB is tighter than the corresponding true NDA CRB. The main limitation of this new MCB is that its application is restricted to carrier phase estimators which are unbiased for all possible values of the received symbol sequence.
In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) f... more In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) for the variance of unbiased, data-aided (DA) symbol-timing estimates, obtained from a block of K samples of a linearly modulated information signal, transmitted through an additive white Gaussian noise channel with random carrier phase. We consider a carrier-phase-independent time-delay estimation scenario wherein the carrier
A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterio... more A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterion is proposed. The algorithm is carrier-phase independent and is designed for operation in burst-mode, narrow-band communication systems employing linear modulation. The accuracy of the proposed algorithm is assessed by simulation using QPSK signaling. The results show that the performance of the proposed synchronizer is very close to the theoretical minimum limit (variance of the estimates near the Cramer-Rao lower bound) and is also significantly better than that of other popular circuits such as the square-law synchronizer
In this correspondence, we propose a new feedforward frequency offset or single frequency estimat... more In this correspondence, we propose a new feedforward frequency offset or single frequency estimator which is based on a single weighted sample correlation with lag k, computed from N noisy observations. The new estimator is a simple generalization of the unweighted Lank-Reed-Pollon (LRP) estimator introduced in [G. W. Lank, I. S. Reed, and G. E. Pollon, ";A Semicoherent Detection and Doppler Estimation Statistic,"; IEEE Transactions on Aerospace and Electronic Systems, vol. 9, no. 2, pp. 151-165, March 1973]. It is shown that by relaxing the requirement for frequency estimation range, an estimator with improved accuracy and lower threshold may be designed. In particular, the estimator is able to provide a 20 log10(k) dB threshold reduction. When N is an integer multiple of k, closed-form expressions are derived for the weighting coefficients and also for the minimum variance. Analytical and simulation results are presented which assess and demonstrate the estimator performance.
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)
A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterio... more A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterion is proposed. The algorithm is carrier-phase independent and is designed for operation in burst-mode, narrow-band communication systems employing linear modulation. The accuracy of the proposed algorithm is assessed by simulation using QPSK signaling. The results show that the performance of the proposed synchronizer is very close to the
In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) f... more In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) for the variance of unbiased, data-aided (DA) symbol-timing estimates, obtained from a block of K samples of a linearly modulated information signal, transmitted through an additive white Gaussian noise channel with random carrier phase. We consider a carrier-phase-independent time-delay estimation scenario wherein the carrier
Power mains network is an attractive medium for data transmission with applications such as secur... more Power mains network is an attractive medium for data transmission with applications such as security monitoring, building control and remote meter reading. Due to the adversity of the medium non-conventional transmission techniques are used, in order to reduce interference in the network, providing feasible data communication. We propose a direct sequence spread-spectrum modulation system for transmission over the power mains
IEEE International Symposium on Circuits and Systems, 1999
A non-data-aided (NDA) feedforward symbol synchronizer for M-ary phase-shift keying (M-PSK) signa... more A non-data-aided (NDA) feedforward symbol synchronizer for M-ary phase-shift keying (M-PSK) signals based upon the maximum-likelihood (ML) criterion is proposed. The algorithm is well suited for burst-mode, narrow-band communication systems, offering significant improvement over other popular synchronizers. Although knowledge of the carrier phase is required (coherent synchronizer) the low variance of the estimates produced by this algorithm make it attractive
In this letter, we derive a new Miller-Chang lower bound (MCB) for the variance of unbiased non-d... more In this letter, we derive a new Miller-Chang lower bound (MCB) for the variance of unbiased non-data-aided (NDA) carrier phase estimates obtained from a block of N samples of a linearly modulated pulse-amplitude modulation or quadrature-amplitude modulation information signal, transmitted through an additive white Gaussian noise channel. This bound is tighter than the corresponding Crame´r-Rao lower bound (CRB) for data-aided or continuous-wave carrier phase estimation (CW-CRB), particularly when N is small. For some given N and sufficiently high signal-to-noise ratios, the MCB is tighter than the corresponding true NDA CRB. The main limitation of this new MCB is that its application is restricted to carrier phase estimators which are unbiased for all possible values of the received symbol sequence.
In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) f... more In this paper, we present the derivation and analysis of the true Crame´r-Rao lower bound (CRB) for the variance of unbiased, data-aided (DA) symbol-timing estimates, obtained from a block of K samples of a linearly modulated information signal, transmitted through an additive white Gaussian noise channel with random carrier phase. We consider a carrier-phase-independent time-delay estimation scenario wherein the carrier
A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterio... more A data-aided (DA) feedforward symbol synchronizer based upon the maximum-likelihood (ML) criterion is proposed. The algorithm is carrier-phase independent and is designed for operation in burst-mode, narrow-band communication systems employing linear modulation. The accuracy of the proposed algorithm is assessed by simulation using QPSK signaling. The results show that the performance of the proposed synchronizer is very close to the theoretical minimum limit (variance of the estimates near the Cramer-Rao lower bound) and is also significantly better than that of other popular circuits such as the square-law synchronizer
In this correspondence, we propose a new feedforward frequency offset or single frequency estimat... more In this correspondence, we propose a new feedforward frequency offset or single frequency estimator which is based on a single weighted sample correlation with lag k, computed from N noisy observations. The new estimator is a simple generalization of the unweighted Lank-Reed-Pollon (LRP) estimator introduced in [G. W. Lank, I. S. Reed, and G. E. Pollon, ";A Semicoherent Detection and Doppler Estimation Statistic,"; IEEE Transactions on Aerospace and Electronic Systems, vol. 9, no. 2, pp. 151-165, March 1973]. It is shown that by relaxing the requirement for frequency estimation range, an estimator with improved accuracy and lower threshold may be designed. In particular, the estimator is able to provide a 20 log10(k) dB threshold reduction. When N is an integer multiple of k, closed-form expressions are derived for the weighting coefficients and also for the minimum variance. Analytical and simulation results are presented which assess and demonstrate the estimator performance.
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