Search

A deconvolution design for the 1/f fractal signal transmission systems is proposed. The design is based on multiscale Kalman deconvolution filter bank supplied in the analysis/synthesis wavelet filter bank. Wavelet transformation for 1/f fractal signal process is used as a multiscale whitening filter for removing the properties of self-similarity and long-range dependence from the fractal signals. An autoregression model is also proposed for the colored processes of the undecimated coefficients of multiscales.

In code-division multiple-access systems transmitting data over time-varying multipath channels, both intersymbol interference (ISI) and multiple-access interference (MAI) arise. In this paper, we address interference suppression, multipath diversity and processing gain protection for multiuser detection with less noise enhancement by using a parallel cancelling scheme. The proposed detector consists of RAKE filter, forward filter, and feedback filter with different functions for each filter. The RAKE filter increases the signal-to-noise ratio by taking the advantage of multipath and code diversities. The forward filter is proposed, in combination with the feedback filter, to remove the effects of MAI and ISI by parallel cancellation. In order to avoid performance deterioration due to unreliable initial estimation in the parallel cancellation, a cost function with proper weighting is introduced to improve the performance of the proposed detector. In the proposed design method, a recursive least square algorithm is employed to update the tap-coefficients of all filters for MAI and ISI cancellation. Finally, the performance of the proposed detector is analyzed and compared with other detectors. Index Terms--CDMA, multipath, fading channels, multiuser detection, parallel interference cancellations.

WUS plays an essential role in plant regeneration. To preliminarily understand the function of Gm- WUS, the related bioinformatics analysis was conducted based on the soybean database. GmWUS and AtWUS proteins were different in the acidic region, while other domains were conservative. Meanwhile, GmWUSa full - length sequence had been cloned. The protein mainly localized in the nucleus, showing that it might be a homeodomain transcription factor. The expression of GmWUS in cotyledons had been detected by qPCR during seeds germination. The results showed that both GmWUSa and GmWUSb expression levels kept rising, but GmWUSa expression decreased in the late stage. GmWUS expression in cotyledon node during cluster buds induction shown an approximate periodic pattern, indicating that GmWUS involved cluster buds diferentiation and regeneration. Comparing the expression of GmWUSa with GmWUSb, they might play a temporal complementary in their functions. The results in this study will help to investigate roles of GmWUS in soybean regeneration, to explain the mechanism of cluster buds formation, and to promote soybean regenerative capacity so as to improve the genetic transformation efficiency by overexpressing this gene. [ABSTRACT FROM AUTHOR]

Carbon microspheres (CMSs) were grafted onto the surface of wool fibers by microwave irradiation. The morphologies of wool fibers grafting CMSs were observed by Scanning Electron Microscopy ( SEM ) . The length and diameter of wool fiber was characterized. Thermal stability of wool fibers grafting CMSs was analysised by TG. The flame retardant properties of wool fibers were measured by the values of LOI (Limiting Oxygen Index). The results showed that the breaking strength of flame retardant wool fibers were increased by 3. 4% and the LOI value of flame retardant wool fiber was 29. 5% which could reach to 29. 2% even after repeat washing (at least 30 times). Compared with original wool fibers, modified wool fibers exhibited excellent flame retardant property. [ABSTRACT FROM AUTHOR]

Develops a scheme of parallel interference cancellers which includes a set of narrowband interference cancellation filters and a set of multiple access interference (MAI) cancellation filters to improve the signal-to-interference ratio and handle the MAI effect. Illustration of adaptive detector design; Presentation of two simulation examples to illustrate the performance of the proposed adaptive detector in direct-sequence code-division multiple access systems; Conclusion.