Temat: MMSE - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs
Autorzy:: Rao, D. S.
Hency, V. D. B.
Powiązania:: https://bibliotekanauki.pl/articles/309403.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: 802.11ac
CSI
delay
MMSE
throughput
Opis:: The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 4; 17-24
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Całościowa Ocena Geriatryczna a kierunki edukacji seniorów
Comprehensive Geriatric Assessment and Directions of Senior’s Education
Autorzy:: Karolina, Piotrowicz
Jerzy, Gąsowski
Powiązania:: https://bibliotekanauki.pl/articles/461648.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie. Instytut Spraw Społecznych
Tematy:: comprehensive geriatric assessment
MMSE
CDT
education
Opis:: The article concisely outlines the issues of the relationship between the aging of the organism and educational activities. Populations in the world are aging. Elderly people generally preserve the ability to learn, although learning takes more time. It is believed that educating the elderly reduces their risk of dementia development. Due to the changes in the aging process, the elderly require comprehensive geriatric assessment.
Źródło:: Labor et Educatio; 2014, 2; 145-151
2353-4745
2544-0179
Pojawia się w:: Labor et Educatio
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Reduced Complexity by Combining Norm Based Ordering MMSE-BSIDE Detection in MIMO Systems
Autorzy:: Jothikumar, R.
Rangaswamy, N.
Powiązania:: https://bibliotekanauki.pl/articles/226286.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: MIMO
MMSE
SD
ML
BSIDE
breadth first search
Opis:: The breadth first signal decoder (BSIDE) is well known for its optimal maximum likelihood (ML) performance with lesser complexity. In this paper, we analyze a multiple-input multiple-output (MIMO) detection scheme that combines; column norm based ordering minimum mean square error (MMSE) and BSIDE detection methods. The investigation is carried out with a breadth first tree traversal technique, where the computational complexity encountered at the lower layers of the tree is high. This can be eliminated by carrying detection in the lower half of the tree structure using MMSE and upper half using BSIDE, after rearranging the column of the channel using norm calculation. The simulation results show that this approach achieves 22% of complexity reduction for 2x2 and 50% for 4x4 MIMO systems without any degradation in the performance.
Źródło:: International Journal of Electronics and Telecommunications; 2017, 63, 3; 305-308
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Use of serious games for the assessment of mild cognitive impairment in the elderly
Autorzy:: Choi, Moon-gee
Powiązania:: https://bibliotekanauki.pl/articles/2097438.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Promocji Wiedzy
Tematy:: serious game
MCI
Mild Cognitive Impairment
cognition
dementia
MMSE
Opis:: This study investigated the use of computer games to detect the symptoms of mild cognitive impairment (MCI), an early stage of dementia, in the elderly. To this end, three serious games were used to measure the visio-perception coordination and psycho-motor abilities, spatial memory, and short-term digit span memory. Subsequently, the correlations between the results of the games and the results of the Korean Mini-Mental State Examination (K-MMSE), a dementia screening test, were analyzed. In addition, the game results of normal elderly persons were compared with those of elderly patients who exhibited MCI symptoms. The results indicated that the game play time and the frequency of errors had significant correlations with K-MMSE. Significant differences were also found in several factors between the control group and the group with MCI. Based on these findings, the advantages and disadvantages of using serious games as tools for screening mild cognitive impairment were discussed.
Źródło:: Applied Computer Science; 2022, 18, 2; 5--15
1895-3735
Pojawia się w:: Applied Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Improved Two-Dimensional Double Successive Projection Algorithm for Massive MIMO Detection
Autorzy:: Chakraborty, Sourav
Sinha, Nirmalendu Bika
Mitra, Monojit
Powiązania:: https://bibliotekanauki.pl/articles/2202981.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: massive MIMO
MMSE
ZF
2D-DSP
QAM
LLR
I2D-DSP
Opis:: In a massive multiple-input multiple-output (MIMO) system, a large number of receiving antennas at the base station can simultaneously serve multiple users. Linear detectors can achieve optimal performance but require large dimensional matrix inversion, which requires a large number of arithmetic operations. Several low complexity solutions are reported in the literature. In this work, we have presented an improved two-dimensional double successive projection (I2D-DSP) algorithm for massive MIMO detection. Simulation results show that the proposed detector performs better than the conventional 2D-DSP algorithm at a lower complexity. The performance under channel correlation also improves with the I2D-DSP scheme. We further developed a soft information generation algorithm to reduce the number of magnitude comparisons. The proposed soft symbol generation method uses real domain operation and can reduce almost 90% flops and magnitude comparisons.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 1; 139--146
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Novel Ideas for Lossless Audio Coding
Autorzy:: Ulacha, G.
Stasiński, R.
Powiązania:: https://bibliotekanauki.pl/articles/227339.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Lossless Audio Coding
context coding
LS predictors
MMSE
MMAE
zero-order entropy
Opis:: Novel ideas for lossless audio coding analyzed in the paper are linked with forward predictor adaptation, and concern optimization of predictors on the basis of zero-order entropy and MMAE criterions, and context sound coding. Direct use of the former criterion is linked with exponential growth of optimization procedure, hence, a suboptimal algorithm having polynomial complexity is proposed. It is shown that on average the new types of predictors are better than those obtained by MMSE technique, while two- and three context systems are on average better than a single predictor one. It also appears that 7-bit PARCOR coefficients in the MPEG-4 ALS standard have insufficient precision for some predictor length, and that for very long frames coding results improve with the predictor rank practically in unlimited way.
Źródło:: International Journal of Electronics and Telecommunications; 2013, 59, 1; 17-23
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Obserwacja poprawy funkcji umysłowych metodą Mini-Mental u chorych Oddziału Geriatrycznego po zaprotezowaniu niedosłuchu
Observation of improvement in mental functions by Mini-Mental method of Patients from Geriatric unit after starting to wear hearing aid
Autorzy:: Pilecka, Karolina
Sekula, Alicja
Różycka, Jagoda
Powiązania:: https://bibliotekanauki.pl/articles/1037910.pdf
Data publikacji:: 2014
Wydawca:: Śląski Uniwersytet Medyczny w Katowicach
Tematy:: pacjent geriatryczny
ubytek słuchu
aparat słuchowy
test mmse
geriatric patient
hearing loss
hearing aid
Opis:: The loss of cognitive function, in addition to physiological changes, is the main illness of patients in geriatric units. There are many factors affecting cognitive ability in elderly patients. Undoubtedly, one of them is the physiological aging process of the hearing organs. One of the methods to assess cognitive functioning is the Mini-Mental Sade Examination (MMSE). The paper presents an assessment of the impact of hearing aids in patients with hearing loss on the outcome of cognitive assessment in MMSE. Analysis of the study results provides answers to questions about the improvement of mental functioning in geriatric patients with hearing loss assessed by MMSE after starting to wear hearing aids.
Utrata funkcji poznawczych jest obok zmian fizjologicznych głównym schorzeniem pacjentów oddziałów geriatrycznych. Istnieje wiele czynników wpływających na zdolności kognitywne pacjentów w podeszłym wieku. Niewątpliwie jednym z nich jest fizjologiczny proces starzenia się narządu słuchu. Jedną z metod oceny funkcjonowania poznawczego jest Krótka Skala Oceny Stanu Psychicznego (Mini-Mental Sade Examinotion – MMSE). W pracy przedstawiono ocenę wpływu zaprotezowania słuchu aparatami słuchowymi u pacjentów z niedosłuchem na wynik oceny czynności poznawczych w teście MMSE. Analiza wyników przeprowadzonych badań dostarcza odpowiedzi na pytania dotyczące poprawy funkcji umysłowych u pacjentów geriatrycznych z niedosłuchem, ocenianych metodą MMSE po zaprotezowaniu słuchu aparatami słuchowymi.
Źródło:: Annales Academiae Medicae Silesiensis; 2014, 68, 3; 164-168
1734-025X
Pojawia się w:: Annales Academiae Medicae Silesiensis
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Improved CSE with DLS-MMSE Criteria in TH-UWB System
Autorzy:: Djebbari, Ali
Elahmar, Sid Ahmed
Powiązania:: https://bibliotekanauki.pl/articles/2058501.pdf
Data publikacji:: 2022
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: channel shortening equalizer
inter-symbol interferences
rake receiver
time hopping
ultra-wide band
ZF-MMSE
Opis:: This article presents a study on the use of deter ministic least squares criteria combined with the minimum mean square error method for the purpose of computing filter coefficients of the channel shortening equalizer. This method is well known to alleviate inter-symbol interference in time hopping UWB systems. The validity of this method is applied to shorten the impulse response of the effective UWB channels and, therefore, reduce the complexity of the rake receiver. Results show a very promising advantage compared to partial rake (P-Rake), selective-rake (S-Rake) and optimal maximum shortening signal-to-noise ratio methods.
Źródło:: Journal of Telecommunications and Information Technology; 2022, 1; 93--98
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: FPGA Implementation of Sphere Detector for Spatial Multiplexing MIMO System
Autorzy:: Mohamed, Asma
Zekry, Abdel Halim
Ibrahim, Reem
Powiązania:: https://bibliotekanauki.pl/articles/963839.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: multiple input multiple output (MIMO)
Spatial Multiplexing(SM)
zero-forcing (ZF)
Minimum Mean Square Estimator (MMSE)
Sorted QR Decomposition (SQRD)
Sphere Decoder (SD)
Opis:: Multiple Input Multiple Output (MIMO (techniques use multiple antennas at both transmitter and receiver for increasing the channel reliability and enhancing the spectral efficiency of wireless communication system.MIMO Spatial Multiplexing (SM) is a technology that can increase the channel capacity without additional spectral resources. The implementation of MIMO detection techniques become a difficult mission as the computational complexity increases with the number of transmitting antenna and constellation size. So designing detection techniques that can recover transmitted signals from Spatial Multiplexing (SM) MIMO with reduced complexity and high performance is challenging. In this survey, the general model of MIMO communication system is presented in addition to multiple MIMO Spatial Multiplexing (SM) detection techniques. These detection techniques are divided into different categories, such as linear detection, Non-linear detection and tree-search detection. Detailed discussions on the advantages and disadvantages of each detection algorithm are introduced. Hardware implementation of Sphere Decoder (SD) algorithm using VHDL/FPGA is also presented.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 2; 245-252
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Comparative Analysis of Channel Estimation Techniques in SISO, MISO and MIMO Systems
Autorzy:: Obinna, O.
Kennedy, O.
Osemwegie, O.
Nsikan, N.
Powiązania:: https://bibliotekanauki.pl/articles/226922.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: multiple-input multiple-output (MIMO)
multiple-input single output (MISO)
single input single output (SISO)
least square estimation (L.S)
minimum mean squared error (MMSE) estimators
mean squared error (MSE)
bit error rate (BER)
Opis:: The ever-growing need for high data rate, bandwidth efficiency, reliability, less complexity and less power consumption in our communication systems is on the increase. Modern techniques have to be developed and put in place to meet these requirements. Research has shown, that compared to conventional Single Input Single Output (SISO) systems, Multiple-Input Single Output (MISO), and Multiple-Input Multiple-Output (MIMO) can actually increase the data rate of a communication system, without actually requiring more transmit power or bandwidth. This paper aims at the investigation of the existing channel estimation techniques. Based on the pilot arrangement, the block type and comb type are compared, employing the Least Square estimation (L.S) and Minimum Mean Squared Error (MMSE) estimators. Pilots occupy bandwidth, minimizing the number of pilots used to estimate the channel, in order to allow for more bandwidth utilization for data transmission, without compromising the accuracy of the estimates is taken into consideration. Various channel interpolation techniques and pilot-data insertion ratio are investigated, simulated and compared, to determine the best performance technique with less complexity and minimum power consumption. As performance measures, the Mean Squared Error (MSE) and Bit Error Rate (BER) as a function of Signal to Noise power Ratio (SNR) of the different channel estimation techniques are plotted, in order to identify the technique with the most optimal performance. The complexity and energy efficiency of the techniques are also investigated. The system modelling and simulations are carried out using Matlab simulation package. The MIMO gives the optimum performance, followed by the MISO and SISO. This is as a result of the diversity and multiplexing gain experienced in the multiple antenna techniques using the STBC.
Źródło:: International Journal of Electronics and Telecommunications; 2017, 63, 3; 299-304
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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