Different methods to design digital filters aimed for equalization of loudspeaker/room responses are considered. Design of inverse filters is based on measured loudspeaker/room impulse responses combined with roomand psychoacoustic knowledge. Frequency dependent smoothing and nonlinear equalization effort is applied, and a new iterative method based on both timeand frequency domain criteria is ...

The cyclic prefix is commonly used in the context of frequency domain equalization in DMT channels. In this paper we observe that it can be used in more general contexts and show its advantages in blind equalization, especially for non minimum phase channels.

Abstract Transmit filtering, transmit equalization, precoding, or power allocation possibly increases the peak-to-average power ratio (PAPR) of transmit single-carrier (SC) signal due to change in frequency-domain spectrum. Recently, we proposed a frequency-domain based selective mapping (FD-SLM) for suppressing the increased PAPR introduced by the transmit frequency-domain equalization (Tx-FDE...

A low-complexity pilot pattern and a frequency-domain channel estimation method for Inter-Carrier Interference (ICI) mitigation is proposed Orthogonal Frequency Division Multiple Access (OFDM) systems. The exploits the band structure of coupling matrix to perform an ICI-free in frequency domain. This relies on some conditions imposed over that simplify complexity significantly, since its same a...

In order to respond to the technologic society expectations and satisfying the nowadays search of services who required a high spectral efficiency, emerge an interest about coherent optical systems, that allows multi-level modulation formats and digital signal processing. So, the study of performance of equalization algorithms at digital domain is essential in order to get the best solutions. T...

The conventional linear prediction can be viewed as a constrained blind equalization problem that has gained a lot of interests along with development of telecommunication networks. Because the blind equalization or deconvolution is a general framework of the inverse problem, the reliable and faster algorithm is requested in many applications. This paper proposes an orthogonal wavelet transform...

The least mean square (LMS) algorithm is the most popular adaptive ltering method due to its simplicity and predictable behavior. The convergence properties of the LMS algorithm can be improved by updating the lter coe cients in the transform domain. This paper presents a new transform domain LMS equalizer, called Discrete Cosine Transform Domain Parallel LMS (DCTPLMS) equalizer, which updates ...

1 Facultatea de Electronică şi Telecomunicaţii, Departamentul Comunicaţii Bd. V. Pârvan Nr. 2, 300223 Timişoara, e-mail [email protected] 2 Facultatea de Electronică şi Telecomunicaţii, Departamentul Comunicaţii Bd. V. Pârvan Nr. 2, 300223 Timişoara, e-mail [email protected] 3 Facultatea de Electronică şi Telecomunicaţii, Departamentul Comunicaţii Bd. V. Pârvan Nr. 2, 300223 Timişoara...

In this paper we elaborate and improve the multiple position room response equalization technique based on fuzzy c-means clustering of Bharitkar and Kyriakakis. Differently from their approach, we perform most of operations in the frequency domain and we apply the fuzzy c-means clustering to the amplitude room frequency responses at different positions. We show in the paper that working in the ...

Frequency-domain pre-equalization (pre-FDE) transmission can be used instead of FDE reception for improving the transmission performance in a severe frequency-selective fading channel. Antenna diversity technique is also a well-known technique for improving the transmission performance, especially, transmit antenna diversity technique has been attracting much attention. In this paper, we propos...