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
Semelhante aos sistemas de multiplexação por divisão de frequência ortogonal (OFDM), o acesso múltiplo por divisão de frequência ortogonal (OFDMA) é vulnerável ao deslocamento de frequência da portadora (CFO). Como o CFO de cada usuário é diferente, a compensação do CFO no uplink OFDMA é muito mais envolvida do que nos sistemas OFDM. Foi demonstrado que o método de compensação por força zero (ZF) é uma solução simples, mas eficaz; entretanto, requer a inversão de uma matriz grande e a complexidade computacional pode ser muito alta. Recentemente, desenvolvemos um método iterativo de baixa complexidade para aliviar esse problema. Neste artigo, consideramos o aspecto teórico do algoritmo. Analisamos especificamente a relação sinal-interferência mais ruído de saída (SINR) do algoritmo. Duas abordagens são utilizadas para a análise; um é simples, mas aproximado, e o outro é complicado, mas exato. O problema da convergência também é discutido. Além da análise, propomos um método de pré-compensação (PC) melhorando o desempenho do algoritmo. As simulações mostram que a nossa análise é precisa e o método PC é eficaz.
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Chao-Yuan HSU, Wen-Rong WU, "Performance Analysis of a Low-Complexity CFO Compensation Scheme for OFDMA Uplink" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 3, pp. 954-963, March 2009, doi: 10.1587/transcom.E92.B.954.
Abstract: Similar to orthogonal frequency-division multiplexing (OFDM) systems, orthogonal frequency-division multiple access (OFDMA) is vulnerable to carrier frequency offset (CFO). Since the CFO of each user is different, CFO compensation in OFDMA uplink is much more involved than that in OFDM systems. It has been shown that the zero-forcing (ZF) compensation method is a simple yet effective remedy; however, it requires the inversion of a large matrix and the computational complexity can be very high. Recently, we have developed a low-complexity iterative method to alleviate this problem. In this paper, we consider the theoretical aspect of the algorithm. We specifically analyze the output signal-to-interference-plus-noise-ratio (SINR) of the algorithm. Two approaches are used for the analysis; one is simple but approximated, and the other is complicated but exact. The convergence problem is also discussed. In addition to the analysis, we propose a pre-compensation (PC) method enhancing the performance of the algorithm. Simulations show that our analysis is accurate and the PC method is effective.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.954/_p
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@ARTICLE{e92-b_3_954,
author={Chao-Yuan HSU, Wen-Rong WU, },
journal={IEICE TRANSACTIONS on Communications},
title={Performance Analysis of a Low-Complexity CFO Compensation Scheme for OFDMA Uplink},
year={2009},
volume={E92-B},
number={3},
pages={954-963},
abstract={Similar to orthogonal frequency-division multiplexing (OFDM) systems, orthogonal frequency-division multiple access (OFDMA) is vulnerable to carrier frequency offset (CFO). Since the CFO of each user is different, CFO compensation in OFDMA uplink is much more involved than that in OFDM systems. It has been shown that the zero-forcing (ZF) compensation method is a simple yet effective remedy; however, it requires the inversion of a large matrix and the computational complexity can be very high. Recently, we have developed a low-complexity iterative method to alleviate this problem. In this paper, we consider the theoretical aspect of the algorithm. We specifically analyze the output signal-to-interference-plus-noise-ratio (SINR) of the algorithm. Two approaches are used for the analysis; one is simple but approximated, and the other is complicated but exact. The convergence problem is also discussed. In addition to the analysis, we propose a pre-compensation (PC) method enhancing the performance of the algorithm. Simulations show that our analysis is accurate and the PC method is effective.},
keywords={},
doi={10.1587/transcom.E92.B.954},
ISSN={1745-1345},
month={March},}
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TY - JOUR
TI - Performance Analysis of a Low-Complexity CFO Compensation Scheme for OFDMA Uplink
T2 - IEICE TRANSACTIONS on Communications
SP - 954
EP - 963
AU - Chao-Yuan HSU
AU - Wen-Rong WU
PY - 2009
DO - 10.1587/transcom.E92.B.954
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 3
JA - IEICE TRANSACTIONS on Communications
Y1 - March 2009
AB - Similar to orthogonal frequency-division multiplexing (OFDM) systems, orthogonal frequency-division multiple access (OFDMA) is vulnerable to carrier frequency offset (CFO). Since the CFO of each user is different, CFO compensation in OFDMA uplink is much more involved than that in OFDM systems. It has been shown that the zero-forcing (ZF) compensation method is a simple yet effective remedy; however, it requires the inversion of a large matrix and the computational complexity can be very high. Recently, we have developed a low-complexity iterative method to alleviate this problem. In this paper, we consider the theoretical aspect of the algorithm. We specifically analyze the output signal-to-interference-plus-noise-ratio (SINR) of the algorithm. Two approaches are used for the analysis; one is simple but approximated, and the other is complicated but exact. The convergence problem is also discussed. In addition to the analysis, we propose a pre-compensation (PC) method enhancing the performance of the algorithm. Simulations show that our analysis is accurate and the PC method is effective.
ER -