{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,28]],"date-time":"2025-02-28T05:35:25Z","timestamp":1740720925352,"version":"3.38.0"},"reference-count":10,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2007,3,1]],"date-time":"2007-03-01T00:00:00Z","timestamp":1172707200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/2.0"},{"start":{"date-parts":[[2007,3,1]],"date-time":"2007-03-01T00:00:00Z","timestamp":1172707200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/2.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Braz Comp Soc"],"published-print":{"date-parts":[[2007,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:italic>Receivers for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems usually perform the channel estimation based on pilot carriers in known positions of the channel spectrum. Interpolation between pilot carriers is applied to determine the channel transfer function in all carrier frequencies. Channel variations along time are compensated by means of interpolation between successive channel estimates on the same carrier frequency. However, not rarely, the fast channel variations exceed the time interpolator capability, as is the case for mobile operation. In this article we present a new channel compensation technique based on the concurrent operation of two stochastic gradient timedomain algorithms, one which minimizes a cost function that measures the received signal energy dispersion and other which minimizes the Euclidean distance between the received digital modulation symbols and the ones in the reference constellation assigned to each OFDM sub-channel. Results show that the new technique advantageously improves the system robustness to fast channel variations since, with a low computational cost, it dramatically reduces the demodulator symbol error rate even when the receiver is operating in an intense dynamic multipath scenario<\/jats:italic>.<\/jats:p>","DOI":"10.1007\/bf03192397","type":"journal-article","created":{"date-parts":[[2010,11,11]],"date-time":"2010-11-11T15:20:14Z","timestamp":1289488814000},"page":"7-16","source":"Crossref","is-referenced-by-count":0,"title":["Frequency domain concurrent channel equalization for multicarrier systems"],"prefix":"10.1007","volume":"13","author":[{"given":"F\u00e1bio","family":"D\u2019Agostini","sequence":"first","affiliation":[]},{"given":"Sirlesio Carboni","family":"J\u00fanior","sequence":"additional","affiliation":[]},{"given":"Maria C. F.","family":"De Castro","sequence":"additional","affiliation":[]},{"given":"Fernando C. C.","family":"De Castro","sequence":"additional","affiliation":[]}],"member":"297","reference":[{"key":"BF03192397_CR1","unstructured":"J. G. Proakis, Digital Communications, 3rd ed., McGraw-Hill, 1995."},{"key":"BF03192397_CR2","doi-asserted-by":"crossref","unstructured":"F. C. C. De Castro, M. C. F. De Castro and D. S. Arantes. \u201cConcurrent Blind Deconvolution for Channel Equalization\u201d,IEEE International Conference On Communications ICC2001, pp. 366\u2013371, Helsinki, Finland, June 2001.","DOI":"10.1109\/ICC.2001.936964"},{"issue":"6","key":"BF03192397_CR3","doi-asserted-by":"publisher","first-page":"471","DOI":"10.1002\/acs.849","volume":"19","author":"S. Chen","year":"2005","unstructured":"S. Chen and E.S. Chang, \u201cFractionally spaced blind equalization with low-complexity concurrent constant modulus algorithm and soft decision-directed scheme\u201d,International Journal of Adaptive Control and Signal Processing, 19(6) pp. 471\u2013484, 2005.","journal-title":"International Journal of Adaptive Control and Signal Processing"},{"key":"BF03192397_CR4","doi-asserted-by":"crossref","unstructured":"R. D. Gitling e S. B. Weinstein, \u201cFractionally-Spaced Equalization: An Improved Digital Transversal Equalizer\u201d,Bell Systems Technical Journal, vol. 60, February 1981.","DOI":"10.1002\/j.1538-7305.1981.tb00240.x"},{"key":"BF03192397_CR5","unstructured":"F. Kazel and S. Kaiser, \u201cMulti-Carrier and Spread Spectrum Systems\u201d, John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO 19 8SQ, pp. 139\u2013158, England, 2003."},{"key":"BF03192397_CR6","unstructured":"ARIB, \u201cTransmission System for Digital Terrestrial Television Broadcasting\u201d, STD-B31 Version 1.5, July 2003."},{"issue":"no 1","key":"BF03192397_CR7","doi-asserted-by":"publisher","first-page":"32","DOI":"10.1109\/TBC.2004.823843","volume":"50","author":"Wu","year":"2004","unstructured":"Wu et.al. \u201cAn ATSC DTV Receiver With Improved Robustness to Multipath and Distributed Transmission Environments\u201d,IEEE Transactions on Broadcasting, vol 50, no 1, pp. 32\u201341, March 2004.","journal-title":"IEEE Transactions on Broadcasting"},{"key":"BF03192397_CR8","unstructured":"V. D. Nguyen, C. Hansen and H. P. 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