The Second International Conference on Communications and Networking, 2010
Abstract In multicarrier (MC) communication receivers, the use of a time-domain equalizer (TEQ) m... more Abstract In multicarrier (MC) communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter-symbol and inter-carrier interferences by shortening the overall channel delay spread. Nevertheless, the TEQ-based MC-receiver structure does not result in optimal bit rate and if one wants to optimize the bit rate a nonlinear cost function has to be maximized. Hence, to optimize the MC system bit rate, we aim to equalize each subchannel separately by maximizing its Signal-to-Interference and Noise Ratio (SINR). The proposed ...
2009 Proceedings of 6th International Symposium on Image and Signal Processing and Analysis, 2009
In multicarrier communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter... more In multicarrier communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter-symbol and inter-carrier interferences by shortening the overall channel delay spread. Based on a novel, accurate model for the signal-to-interference and noise ratio (SINR) at each subcarrier, a new approach to fractionally spaced TEQ design is proposed, which maximizes the ratio of total desired signal power (measured across all used subcarriers) to total distortion (i.e. noise plus interferences) power. Numerical simulations confirm the improvement in performance of the proposed approach with respect to previous methods.
In UMTS system, the performance with the power control scheme depends on factors as Doppler fre- ... more In UMTS system, the performance with the power control scheme depends on factors as Doppler fre- quency, loop delay and step size. In this paper, a multi-level power control scheme with NLMS predictive algorithm is proposed to combat fading caused by the mobility of mobile stations and to improve the capacity in UMTS systems. We discuss the features of the
2009 3rd International Conference on Signals, Circuits and Systems (SCS), 2009
Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coeff... more Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coefficients of the time domain equalizer (TEQ) in multicarrier system. The TEQ design investigates a second order statistics property of the received multicarrier signal, given by the presence of the cyclic prefix in the source. Here no assumptions about source stationarity and whiteness are needed to formulate the channel shortening criterion. The proposed shortener is implemented as a stochastic gradient descent algorithm and is ...
Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coeff... more Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coefficients of the time domain equalizer (TEQ) in multicarrier system. The TEQ design investigates a second order statistics property of the received multicarrier signal, given by the presence of the cyclic prefix in the source. Here no assumptions about source stationarity and whiteness are needed to formulate the channel shortening criterion. The proposed shortener is implemented as a stochastic gradient descent algorithm and is ...
The Second International Conference on Communications and Networking, 2010
Abstract In multicarrier (MC) communication receivers, the use of a time-domain equalizer (TEQ) m... more Abstract In multicarrier (MC) communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter-symbol and inter-carrier interferences by shortening the overall channel delay spread. Nevertheless, the TEQ-based MC-receiver structure does not result in optimal bit rate and if one wants to optimize the bit rate a nonlinear cost function has to be maximized. Hence, to optimize the MC system bit rate, we aim to equalize each subchannel separately by maximizing its Signal-to-Interference and Noise Ratio (SINR). The proposed ...
2009 Proceedings of 6th International Symposium on Image and Signal Processing and Analysis, 2009
In multicarrier communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter... more In multicarrier communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter-symbol and inter-carrier interferences by shortening the overall channel delay spread. Based on a novel, accurate model for the signal-to-interference and noise ratio (SINR) at each subcarrier, a new approach to fractionally spaced TEQ design is proposed, which maximizes the ratio of total desired signal power (measured across all used subcarriers) to total distortion (i.e. noise plus interferences) power. Numerical simulations confirm the improvement in performance of the proposed approach with respect to previous methods.
In UMTS system, the performance with the power control scheme depends on factors as Doppler fre- ... more In UMTS system, the performance with the power control scheme depends on factors as Doppler fre- quency, loop delay and step size. In this paper, a multi-level power control scheme with NLMS predictive algorithm is proposed to combat fading caused by the mobility of mobile stations and to improve the capacity in UMTS systems. We discuss the features of the
2009 3rd International Conference on Signals, Circuits and Systems (SCS), 2009
Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coeff... more Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coefficients of the time domain equalizer (TEQ) in multicarrier system. The TEQ design investigates a second order statistics property of the received multicarrier signal, given by the presence of the cyclic prefix in the source. Here no assumptions about source stationarity and whiteness are needed to formulate the channel shortening criterion. The proposed shortener is implemented as a stochastic gradient descent algorithm and is ...
Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coeff... more Abstract In this paper, we propose a novel blind channel shortening algorithm to update the coefficients of the time domain equalizer (TEQ) in multicarrier system. The TEQ design investigates a second order statistics property of the received multicarrier signal, given by the presence of the cyclic prefix in the source. Here no assumptions about source stationarity and whiteness are needed to formulate the channel shortening criterion. The proposed shortener is implemented as a stochastic gradient descent algorithm and is ...
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