The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
A formação de feixe adaptativo, usando o problema da equação residual do gradiente conjugado, é aplicada a um arranjo de estação base, no link ascendente UTRA-TDD. Um modelo de canal direcional de banda larga é usado, caracterizando cenários específicos de microcélulas do tipo rua. Estes diferem no número de terminais móveis, agrupados e colocados ao longo do eixo da rua, e nas distâncias à estação base. Os spreads de tempo e ângulo de chegada e o conteúdo de interferência no ar são os principais parâmetros inerentemente variados e analisados. O ganho médio de formação de feixe e a relação sinal-ruído são avaliados, variando também o número de elementos do arranjo. O elevado número de sinais correlacionados e estreitamente correlacionados que chegam, juntamente com a natureza composta da matriz de correlação na função de custo do algoritmo, fazem com que outras soluções além das MMSE possam levar à melhor supressão de interferência, para os cenários testados. Dentre os vários componentes de potência interferentes ponderados, o mais relevante é devido aos sinais atrasados de todos os outros enlaces. A combinação do número de códigos ortogonais que chegam, os spreads de tempo de chegada e ângulo de chegada condicionam o desempenho da formação de feixe: o número de elementos do array afeta o desempenho, dependendo da distância do terminal móvel até a estação base e do número de links ativos; para distâncias curtas e grande número de usuários, uma maior dispersão no tempo de chegada degrada o desempenho do formador de feixe, em detrimento do efeito oposto da dispersão no ângulo de chegada; o número de utilizadores activos afecta o ganho de formação de feixe especialmente no caso em que os spreads de atraso são maiores, isto é, para distâncias mais curtas do terminal móvel até à estação base.
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João M. GIL, Luis M. CORREIA, "Impact of Wideband Directional Propagation Channel Characteristics on Adaptive Beamforming" in IEICE TRANSACTIONS on Communications,
vol. E85-B, no. 12, pp. 2640-2647, December 2002, doi: .
Abstract: Adaptive beamforming, using the Conjugate Gradient Normal Equation Residual problem, is applied to a base station array, in the UTRA-TDD up-link. A Wideband Directional Channel Model is used, characterising specific micro-cell, street-type scenarios. These differ in the number of mobile terminals, grouped and placed along the street axis, and on their distances to the base station. Time- and angle-of-arrival spreads, and on-the-air interference content are the main parameters inherently varied and analysed. The average beamforming gain and signal-to-noise ratio are evaluated, also varying the number of array elements. The high number of arriving correlated and closely correlated signals, together with the composed nature of the correlation matrix in the algorithm's cost function, result in that other than the MMSE solutions may lead to the best interference suppression, for the tested scenarios. Among the several weighted interfering power components, the most relevant is due to the delayed signals from all the other links. The combination of the number of arriving orthogonal codes, time-of-arrival and angle-of-arrival spreads condition beamforming performance: the number of array elements affect performance, depending on the mobile terminal distance to the base station, and on the number of active links; for short distances and large number of users, larger time-of-arrival spread degrades beamformer performance, over the opposing effect of angle-of-arrival spread; the number of active users affects beamforming gain especially in the case that delay spreads are larger, i.e., for shorter mobile terminal distances to the base station.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e85-b_12_2640/_p
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@ARTICLE{e85-b_12_2640,
author={João M. GIL, Luis M. CORREIA, },
journal={IEICE TRANSACTIONS on Communications},
title={Impact of Wideband Directional Propagation Channel Characteristics on Adaptive Beamforming},
year={2002},
volume={E85-B},
number={12},
pages={2640-2647},
abstract={Adaptive beamforming, using the Conjugate Gradient Normal Equation Residual problem, is applied to a base station array, in the UTRA-TDD up-link. A Wideband Directional Channel Model is used, characterising specific micro-cell, street-type scenarios. These differ in the number of mobile terminals, grouped and placed along the street axis, and on their distances to the base station. Time- and angle-of-arrival spreads, and on-the-air interference content are the main parameters inherently varied and analysed. The average beamforming gain and signal-to-noise ratio are evaluated, also varying the number of array elements. The high number of arriving correlated and closely correlated signals, together with the composed nature of the correlation matrix in the algorithm's cost function, result in that other than the MMSE solutions may lead to the best interference suppression, for the tested scenarios. Among the several weighted interfering power components, the most relevant is due to the delayed signals from all the other links. The combination of the number of arriving orthogonal codes, time-of-arrival and angle-of-arrival spreads condition beamforming performance: the number of array elements affect performance, depending on the mobile terminal distance to the base station, and on the number of active links; for short distances and large number of users, larger time-of-arrival spread degrades beamformer performance, over the opposing effect of angle-of-arrival spread; the number of active users affects beamforming gain especially in the case that delay spreads are larger, i.e., for shorter mobile terminal distances to the base station.},
keywords={},
doi={},
ISSN={},
month={December},}
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TY - JOUR
TI - Impact of Wideband Directional Propagation Channel Characteristics on Adaptive Beamforming
T2 - IEICE TRANSACTIONS on Communications
SP - 2640
EP - 2647
AU - João M. GIL
AU - Luis M. CORREIA
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E85-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2002
AB - Adaptive beamforming, using the Conjugate Gradient Normal Equation Residual problem, is applied to a base station array, in the UTRA-TDD up-link. A Wideband Directional Channel Model is used, characterising specific micro-cell, street-type scenarios. These differ in the number of mobile terminals, grouped and placed along the street axis, and on their distances to the base station. Time- and angle-of-arrival spreads, and on-the-air interference content are the main parameters inherently varied and analysed. The average beamforming gain and signal-to-noise ratio are evaluated, also varying the number of array elements. The high number of arriving correlated and closely correlated signals, together with the composed nature of the correlation matrix in the algorithm's cost function, result in that other than the MMSE solutions may lead to the best interference suppression, for the tested scenarios. Among the several weighted interfering power components, the most relevant is due to the delayed signals from all the other links. The combination of the number of arriving orthogonal codes, time-of-arrival and angle-of-arrival spreads condition beamforming performance: the number of array elements affect performance, depending on the mobile terminal distance to the base station, and on the number of active links; for short distances and large number of users, larger time-of-arrival spread degrades beamformer performance, over the opposing effect of angle-of-arrival spread; the number of active users affects beamforming gain especially in the case that delay spreads are larger, i.e., for shorter mobile terminal distances to the base station.
ER -