ORGANİZASYONLARDA ÖLÇEK KÜÇÜLTME VE ÖLÇEK KÜÇÜLTME ÇALIŞMALARINDA ÖNEM TAŞIYAN UNSURLAR by G.eren Gümüştekin

Get full text

Time-varying channel estimation in OFDM systems based on multiple symbols BEM by Yong DING, Shan OUYANG, Yue-lei XIE, Jun-zheng JIANG, Xiao-mao CHEN

“…In view of the problem of low frequency spectrum utilization for the time-varying channel estimation in orthogonal frequency division multiplexing(OFDM) systems based on basis expansion model (BEM),a new method based on multiple symbols BEM was proposed.Compared with the conventional method based on single symbol,the proposed method reduced the subcarriers for pilots.And by means of the baseline tilting technique,the new method mitigated the Gibbs phenomenon caused by Fourier series expansion.The theoretical analysis reveals that the channel model error is reduced due to the introduction of the baseline tilting technique when the normalized Doppler frequency is no more than <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML"> <mfrac> <mrow> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>−</mo><mfrac> <mn>1</mn> <mi>M</mi> </mfrac> </mrow> <mrow> <mn>1</mn><mo>+</mo><mfrac> <mrow> <msub> <mi>N</mi> <mi>g</mi> </msub> </mrow> <mi>N</mi> </mfrac> </mrow> </mfrac> <mtext> </mtext></math></inline-formula>.Finally,the numerical simulation shows that compared with conventional methods,the proposed algorithm achieves significant improvement on the estimation error performance and bit error rate (BER) performance under the conditions of the corresponding time-varying channel.…”
Get full text

Underwater acoustic OFDM channel equalization based on virtual time reversal mirror by Yan-ling YIN, Gang QIAO, Song-zuo LIU

“…To solve the problem of the severe inter-symbol interference of orthogonal frequency division multiplexing (OFDM) communication caused by underwater acoustic multipath channel,a virtual time reversal channel equalization scheme was proposed.VTRM was able to shorten the channel impulse response and alleviate the phase distortion caused by the acoustic channel for its characteristic of the temporal compression and phase conjugation in frequency domain.The matching pursuit (MP) algorithm was applied to estimate the channel impulse response which could estimate the channel amplitude,time delay and phase accurately.It provided the channel information for the VTRM channel equalization.It also improved a lot compared to the traditional matching correlation channel estimation method which couldn't estimate the channel phase and the estimation precision was low.The simulation,pool trail and Songhua lake experiment show that the performance of VTRM channel equalization is better than that of the PTRM and LS channel equalization in the OFDM underwater acoustic communication.…”
Get full text

Spatial Diversity Scheme to Efficiently Cancel ISI and ICI in OFDM-OQAM Systems by Nizar Zorba, Faouzi Bader

“…The resultant scheme OQAM-OFDM-MIMO data rate is obtained in a closed form expression and proved to be higher than the classical CP-OFDM systems.…”
Get full text

Skadede ofre for vold i Oslo by Brit Bergersen Lind

Get full text

Retsstillingen for ofre i U.S.A by Malene Frese-Madsen

Get full text

DFT-SV-OFDM based adaptive multi-rate DFT scrambling vector code division multiple access by Gao ZHOU, Ping-zhi FAN, Li HAO

Subjects: “…OFDM…”
Get full text

Epithelial stem cells from human small bronchi offer a potential for therapy of idiopathic pulmonary fibrosisResearch in context by Zeyu Liu, Qi Zheng, Zhoubin Li, Moli Huang, Cheng Zhong, Ruize Yu, Rong Jiang, Haotian Dai, Jingyuan Zhang, Xiaohua Gu, Yongle Xu, Chunwei Li, Shan Shan, Feng Xu, Yue Hong, Tao Ren

“…Interpretation: Epithelia of small bronchi in IPF contain functional and expandable basal stem cells, which exert therapeutic benefits via bronchoscopic implantation. Our findings offer a potential for IPF treatment by targeting small airways. …”
Get full text

På spaning efter det offer som ej flytt: Bemästrande av människohandelsoffer och viljans inverkan på lagföringen by Märta C. Johansson

Get full text

Sounds and Natures Do Often Agree: Prediction of Esports Players’ Performance in Fighting Games Based on the Operating Sounds of Game Controllers by Yamato Hiratsuka, Kazuki Kuga, Takahiro Miura, Tetsuo Tanaka, Mari Ueda

Get full text

Offering a Pattern of Ecotourism Management Pattern with an Emphasis on the Urban Ecological Textures (Case Study: District 9 of Isfahan’s Municipality) by Somayeh Hamsian Ettefagh, Hussein kalantari khalilabad, Muhammad Mire’ei

Get full text

In vitro degradation of non-starch polysaccharide residues in the digesta of broilers offered wheat-soy or maize-soy diets by feed enzymes by E. Kim, N.K. Morgan, A.F. Moss, A. Solbak, L. Li, P. Ader, M. Choct

Get full text

Sociedades, mobilidades, deslocamentos: os territórios da espera. O caso dos mundos americanos (de ontem a hoje) by Laurent Vidal, Alain Musset, Dominique Vidal

Get full text

The Women in ORTHopaedics Program Offers Early Exposure to Orthopaedic Surgery for Young Women. A Pre- and Post-Event Survey Comparison by Marianna Hsu, BSc candidate, Hayley Spurr, MB, BCh, BAO, FRCSC, Anthony P. Cooper, MBChB, FRCSC, Emily K. Schaeffer, PhD

“…In response, our Department of Orthopaedics developed a specialized orthopaedic curriculum, Women in ORTHopaedics (WORTH), tailored specifically for young women in high school. This program offers early exposure and mentorship opportunities within the orthopaedic field. …”
Get full text

Quality of care offered by health care retail markets for medication abortion self-management: Findings from states in Nigeria and India by Mridula Shankar, Elizabeth Omoluabi, Funmilola M. OlaOlorun, Anoop Khanna, Danish Ahmad, Caroline Moreau, Suzanne O. Bell

Get full text

Moradores de cortiço, capitães da areia e cobradores urbanos: personagens excluídos da construção da ordem nacional by Eliana Kuster

Get full text

Piecewise-linear companding transform for peak-to-average power ratio reduction of OFDM signals by YANG Pin-lu, HU Ai-qun

“…In order to reduce the peak-to-average power ratio（PAPR） of orthogonal frequency division multiplexing（OFDM） signals,a piecewise-linear companding transform was proposed.Small amplitudes were multiplied by a scale factor,while large ones were not only multiplied by a scale factor but also added by a shift.The resulting companding transform was piecewise-linear and continuous.It can provide significant PAPR reduction performance with low compu-tational complexity,and has low influence on system performances through piecewise transform.It is shown by theoreti-cal analysis and simulation that,a good trade-off between PAPR reduction and bit-error-rate performances can be achieved by carefully choosing the two scales and the shift.Furthermore,compared with existing linear and nonlinear companding transforms,a better power spectral density performance can be achieved.…”
Get full text

Blind frequency tracking based on time-domain spreading for MB-OFDM-UWB systems by Li-jun GE, Hong WU

Subjects: “…MB-OFDM…”
Get full text

Modified SLM algorithm based on cyclic shift and signal combination in MIMO-OFDM system by Wu-jun HU, Lin YANG

Subjects: “…MIMO-OFDM…”
Get full text

Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming by Guo LI, Ni WEN, Fengkui GONG, Jian ZHANG, Sihan ZHANG

Subjects: “…OFDM…”
Get full text