Subchip multipath delay estimation for downlink WCDMA system based on Teager-Kaiser operator

Hamila, Ridha; Lohan, Elena Simona; Renfors, Markku

doi:10.1109/lcomm.2002.807439

Cited by 28 publications

(25 citation statements)

References 5 publications

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“…Both models allow the derivation of analytical expressions for the correlation coefficients at the fingers outputs of a RAKE receiver. It also has to be noticed that the theoretical assumptions of rectangular pulses and uniform PDP are quite common in CDMA systems, [23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

A Novel Rake Receiver Design for Wideband Wireless Communications

Baltzis

Sahalos

2007

Wireless Pers Commun

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In this paper a novel RAKE receiver design is proposed. Its main characteristic is its non-uniform taps distribution. A wide-sense stationary uncorrelated scattering (WSSUS) frequency-selective Rayleigh fading channel is assumed. Uniform and exponential power delay profiles (PDPs) are considered. Taps positions optimization is done according to the Maximum Power Minimum Correlation (MPMC) criterion. This implies the simultaneous maximization of the sum of squares of total average signal power received in each finger and minimization of the sum of squares of autocorrelation between each pair of fingers. Robustness of the technique with respect to errors in channel estimation or in the optimum taps placement is also studied.Several simulation examples of the proposed receiver show its superior performance comparing with other implementations. Finally analytical expressions for the correlation coefficients at the branches outputs of a RAKE receiver for rectangular chip waveforms are derived.

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Section: Introductionmentioning

confidence: 99%

A Novel Rake Receiver Design for Wideband Wireless Communications

Baltzis

Sahalos

2007

Wireless Pers Commun

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“…To alleviate this problem, we propose a novel method based on Teager energy operator (TEO) to detect glottal activity in both voiced and unvoiced regions of speech. TEO has been used extensively in speech literature for speech and speaker recognition (Jabloun et al 1999;Patil and Parhi 2010a), emotion/stress classification (Zhou et al 2001), speech enhancement (Bahoura and Rouat 2001), voice pathology detection , formant estimation (Maragos et al 1991), speech synthesis (Sinder 1999), signal detection (Boudraa et al 2008) and multipath delay estimation (Hamila et al 2003) etc. However, there is very little work on using TEO for epoch detection or glottal activity detection.…”

Section: Brief History Of Epoch Extraction Methodsmentioning

confidence: 99%

Effectiveness of Teager energy operator for epoch detection from speech signals

Patil

Viswanath

2011

Int J Speech Technol

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In this paper, we try to present the problem of epoch detection from a different perspective that not only deals with estimation of epoch instances (i.e., glottal activity) but also with quantification of the absence of epochs (i.e., no glottal activity) in the unvoiced regions of speech signal. Most of the epoch detection methods perform significantly well in the voiced regions of speech but are not robust enough in the unvoiced regions of speech, i.e., they detect a number of pseudo epochs in the unvoiced regions of speech. We propose a simple method based on Teager Energy Operator (TEO) which not only determines the epochs in voiced region (due to its superior temporal resolution and its ability to capture airflow properties through the glottis) but also is very effective in unvoiced region. Recently proposed methods such as 0-Hz resonator-based method and DYPSA method gave a combined rate (CR) (for detecting epochs in voiced and unvoiced regions of speech) of 74.7% and 60%, respectively and a pseudo epoch rate (PER) (i.e., spurious epochs in the unvoiced regions of speech) of 62.9% and 54.04%, respectively. On the other hand, our proposed method gave a CR and PER of 87% and 0.27%, respectively. This result suggests that the proposed method captures glottal activity more efficiently both in voiced and unvoiced regions of speech signal. The performance of the proposed method is demonstrated using publicly available CMU-Arctic database using the epoch information from the electro-glottograph (EGG) as reference signal to serve as ground truth for estimation of glottal closure instants (GCI).

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“…The Teager Kaiser based delay estimation technique is based on the principle of extracting the signal energy of various channel paths via a nonlinear TK operator Hamila (2002), Hamila et al (2003). The output Ψ TK (x(n)) of TK operator applied to a discrete signal x(n), can be defined as Hamila et al (2003):…”

Section: Teager Kaiser Operatormentioning

confidence: 99%

“…The output Ψ TK (x(n)) of TK operator applied to a discrete signal x(n), can be defined as Hamila et al (2003):…”

Section: Teager Kaiser Operatormentioning

confidence: 99%