orthogonal frequency division multiplexing based on offset qam

Ngày tải lên: 26/05/2013, 21:28

... 16 February 2006 One of the UWB proposals in the IEEE P802.15 WPAN project is to use a multiband orthogonal frequency- division multiplexing (OFDM) system and punctured convolutional codes for UWB ... different reflections in the channel. Two basic solu- tions for inter-symbol interference (ISI) caused by multipath channels are equalization and orthogonal frequency- division multiplexing (OFDM) ... Again, two consecutive clock cycle outputs are mapped onto 64- QAM constellation via Gr ay mapping. There are three advantages for such a modification. (a) We consider fewer interleavers: only one interleaver...

Ngày tải lên: 22/06/2014, 22:20

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Ngày tải lên: 09/07/2014, 08:16

... of ions concentration with the corresponding valuesatmean(Table3). Atthemeanvalue,bicarbonateandcalcium ion concentrations are the highest among anions and cations ... DangMai,NguyenThanhLan/VNUJournalofScience,EarthSciences23(2007)194‐201 200 Table2.Concentration frequency ofNa + inrainyseasonofHoloceneaquifer Concen‐ tration(mg/l) Number ofsamples Frequency (%) Concen‐ tration(mg/l) Numberof samples Frequency (%) Concen‐ tration(mg/l) Number ofsamples Frequency (%) 0‐50 ... 1000-9000  Fig.5. Frequency distributionofNa + ionsinrainy seasonofHoloceneaquifer. 2.2. Frequency distributionindryseasonofHolocene aquifer Bicarbonate(HCO 3 - )ions In dry season, bicarbonate ions concentration of Holocene aquifer varies...

Ngày tải lên: 22/03/2014, 12:20

... illustration of stationary and nonstationary blocks in a sequence of frames (box 1-stationary block, box 2-nonstationary block). 3. Video Analysis and Reconstr uction Using Time -Frequency Representations ... time -frequency- based proce- dure for temporally stationary and nonstationary coefficients characterization. Various time -frequency distributions have been used for the analysis of noisy nonstationary ... Time -frequency representations of coefficients belonging to: (a) nonstationary block, (b) stationary block. Thetemporalsequenceofcoefficients may contain the nonstationarities due to the motion, noise,...

Ngày tải lên: 21/06/2014, 08:20

... the conventional minimum mean-squared error- (MMSE-) based filtering for 4-by-4 MIMO multiplexing (1 6QAM with the rate-3/4 Turbo code is assumed). 1. Introduction Orthogonal frequency division multiplexing ... detection- (MLD-) based signal detection method for or thogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) multiplexing with frequency domain spreading and code multiplexing. ... the computational complexity by utilizing signal orthogonalization based on QR decomposition of the product of the channel and spreading code matrices in the frequency domain. Simulation results...

Ngày tải lên: 21/06/2014, 08:20

... separation and has not been addressed adequately. We propose a monaural system based on binary time -frequency masking with an emphasis on robust decisions in time- frequency regions, where harmonics ... D. L. Wang, “Monaural musical sound separation based on pitch and common amplitude modu- lation,” IEEE Transactions on Audio, Speech, and Language Processing. In press. [25] D. Huron, “The avoidance ... proposed system is to utilize con- textual information available in a musical scene. Harmonics in nonoverlapped regions, called nonoverlapped harmonics, contain information that can be used to infer...

Ngày tải lên: 21/06/2014, 20:20

... in the edgy regions. To do this, we propose to consider only pixel locations which belong to an edgy region (R E ) and minimize the following cost function which is based on region-adaptive weights ... and reconstruction were defined O. A. Omer and T. Tanaka 5 Initial interpolation Mosaicked image High -frequency bands projection High -frequency bands Subband decomposition Force high -frequency ... found that only 47.7% of the to- tal area of the 20 test images is edgy. 4. CONCLUSION We have developed an iterative demosaicking algorithm based on optimization and projection in different frequency bands....

Ngày tải lên: 22/06/2014, 19:20

... situation. As for the effect of orthogonal- ization, it is evident that the orthogonalization reduces the cross-term components in general. The results obtained be- fore orthogonalization are ... Separation of Nonstationary Sources Based on Spatial Time -Frequency Distributions Yimin Zhang and Moeness G. Amin Wireless Communications and Positioning Lab, Center for Advanced Communications, ... 250 Time (b) With orthogonalization, based on C z (t, f )(α 3 = 0.9, γ 3 = 0.2) 0.5 0.4 0.3 0.2 0.1 0 Normalized frequency 0 50 100 150 200 250 Time (c) Without orthogonalization, based on |C x (t, f )|...

Ngày tải lên: 22/06/2014, 23:20

... MUSIC- based direction finding and polarization estimation in spatio- polarizational beamspace,” IEEE Transactions on Antennas and Propagation, vol. 48, pp. 1235–1245, 2000. [17] K. T. Wong and ... IEEE Transactions on Sig nal Processing, vol. 47, no. 10, pp. 2845–2852, 1999. [10] K. T. Wong, “Direction finding/polarization estimation— dipole and/or loop triads,” IEEE Transactions on Aerospace ... combine the ESPRIT -based frequency estimation with Wong’s ESPRIT -based 2D DOA estimation scheme in [18] to yield extended-aperture two- dimensional (2D) arrival angle and carrier frequency esti- mates...

Ngày tải lên: 22/06/2014, 23:20

Ngày tải lên: 27/07/2014, 23:25

... Ligation reaction based on the Diels Alder Reaction with invers electron demand. [EP 06 012 414.6]. 6-10-2006. 46. Reppe W, Schlichting O, Klager K, et al. Cyclisierende Polymerisation von Acetylen ... Gd concentrations. This modularly designed contrast agent represents a new tool for improved monitoring and evaluation of interventions at the gene transcription level. Also, a widespread monitoring ... solu- tion containing 2% DMSO as a control. After 25 min- utes, the solutions were removed from the cells, then cells were washed twice with Hank’s solution and kept in Hank’s solution containing...

Ngày tải lên: 26/10/2012, 09:07

... CLASSIFICATION, EPITHESIS and QUALIFICATION, interpersonal systems of PERSON and ATTITUDE, and textual systems of DETERMINATION. But the way the metafunctional contributions map structurally one onto ... emotion in comparison with five ones by Ortony and Johnson ( sadness, happiness, love, anger, hate) 3 Emotion metaphor An investigation into the role of metaphor in description of emotion in ... description of emotion in poetic discourse 3 for believing that the context of (linguistic) emotional expression may be a profitable one within which to study metaphor production. Emotional states...

Ngày tải lên: 07/11/2012, 14:44

... for One-Dimensional Consolidation, ASTM Geotechnical Testing J., 4 (4): 161-168. Sridharan, A. and Prakash, K. 1995. Discussion on ‘Limitations of Conventional Analysis of Consolidation Settlement’, ... and Foundation Engineering Division, ASCE, 103 (3): 417- 430. Murakami, Y. 1977. Effect of Loading Duration on Results of One-dimensional Consolidation Tests, Soils and Foundations, Japan, ... determination of the coefficient of consolidation (Olson, 1986; Robinson, 1999). SUMMARY AND CONCLUSIONS In the present study, a new method is developed for Consolidation Characteristics … ...

Ngày tải lên: 21/03/2013, 14:09

... destruction–coagulation, coagulation–condensation, condensation crystallization. Afterthat, Glukhovsky theories were extended by different authors. In this theories [3], dissolution of the ... dissolution of solid particles at the surface results in the liberation of aluminate and silicate most likely in monomeric form into solution. This is the mechanism responsible for conversion of ... absorption Water absorption of unfired brick decreases respectively as content of fly ash is increased. Figure 9 shows the relationship between fly ash content and water absorption with content...

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