[PDF] Top 20 An iterative detection technique for DS-CDMA signals with strong nonlinear distortion effects

... where an iterative cancela- tion of deliberate nonlinear distortion effects is carried ...codes with length N = K = K U = 256 ...to an ideal envelope clipping, with ... See full document

... MC- CDMA systems (MultiCarrier - Coded Division Multiple Access) where the transmitted signals face strong nonlinear distortion ...a nonlinear operation consisting on a clipping ... See full document

... consider an iterative multiuser receiver with PIC (Par- allel Interference ...the detection of A(k) em- ploys the structure depicted in ... See full document

... Abstract—A DS-CDMA (Direct Sequence-Coded Division Mul- tiple Access) system has maximum spectral efficiency if the system is fully loaded ...employ signals with bandwidth equal to the chip ... See full document

... considered, with IB-DFE receivers (Iterative Block Decision Feedback Equal- ization) based on the ones proposed in ...transmitted signals while maintaining the spectral occupation of conventional ... See full document

... MC-CDMA signals are OFDM-like multicarrier signals, they have high envelope fluctuations and a high PMEPR (Peak-to-Mean Envelope Power Ratio) which leads to amplifi- cation ...transmitted ... See full document

... a DS-CDMA system employing block transmission techniques, with an appropriate cyclic ex- tension appended to each ...block. An iterative receiver structure is proposed which can ... See full document

... a CDMA scheme with OFDM modulation (Orthogonal Frequency Division Multi- plexing) [5], so as to allow high transmission rates over severe time-dispersive channels without the need of a com- plex receiver ... See full document

... Since an MMSE FDE does not perform an ideal channel inversion, when this type of equalizer is employed in DS-CDMA systems we are not able to fully orthogonalize the different spreading ... See full document

... codes, an FDE (Frequency-Domain Equalizer) is required before the despreading operation ...channels with deep in-band notches, the FDE is usually optimized under an MMSE criterion (Minimum ... See full document

... combined with a frequency-domain filtering operation, which can be jointly repeated several ...processing technique employed by the ...[14], with uncorrelated Rayleigh fading on the different paths ... See full document

... combined with frequency- domain filtering was shown to be an effective way of reducing the envelope fluctuations (and, inherently, the PMEPR) of DS- CDMA signals, while maintaining the ... See full document

... together with high system ...combined with the relatively low envelope °uctuations of the DS-CDMA signal associ- ated to each spreading sequence, makes these schemes good candidates for ... See full document

... this technique can be further extended to find more number of code clones on the basis of which the potential clones are found so that more accurate results can be obtained and the output can be integrated ... See full document

... their detection by both the human reader and CAD, it is also the ability to discriminate between polyps and polyp mimics (poorly tagged stool residuals, folds, inverted diverticula) especially in less distended ... See full document

... of an interference channel for a given user is one half the rate of its interference-free capacity in the high transmit power regime, for any number of users ...19]. With this strategy, more interferers can ... See full document

... is an improvement of Newton’s method. The order increases by at least two at the expense of additional function evaluation at another point iterated by the Newton’s method. To improve the local order of ... See full document

... Esta dissertação de mestrado vem trazer um estudo sobre alguns aspectos que influenciam na aplicação de antenas adaptativas em sistemas celulares DS-CDMA (ou simplesmente CDMA). Foram detalhados ... See full document

... LINC) technique where P nonlinear amplifiers are consid- ered to achieve an efficient amplification and at the same contributing to improve the total output RF ...the nonlinear ... See full document

... Nesses algoritmos, os ângulos de chegada (AOA) dos sinais recebidos são inicialmente estimados, e a partir dessas informações os pesos do arranjo são calculados de forma que o diagrama de radiação resultante possua um ... See full document