info:eu-repo/semantics/article
Carrier Frequency Offset Compensation for OFDMA Systems Using Circular Banded Matrices
Fecha
2013-07Registro en:
González, Gustavo José; Gregorio, Fernando Hugo; Cousseau, Juan Edmundo; Carrier Frequency Offset Compensation for OFDMA Systems Using Circular Banded Matrices; Planta Piloto de Ingeniería Química; Latin American Applied Research; 43; 3; 7-2013; 255-260
0327-0793
1851-8796
Autor
González, Gustavo José
Gregorio, Fernando Hugo
Cousseau, Juan Edmundo
Resumen
Orthogonal frequency division multiple access (OFDMA) is a multiuser communication technique that allocates to each user a set of orthogonal carriers. In the presence of carrier frequency offset (CFO) the orthogonality among carriers is lost and it is impossible to recover the information of the users without CFO compensation. The resulting multiple access interference (MAI) can be described as an interference matrix of large dimensions. In order to compensate for the CFO, this matrix must be inverted, what is computationally complex. Therefore, a banded matrix approximation is usually introduced. In this paper we propose a circular banded matrix which is a better approximation to the actual interference matrix. Also, by means of numerical simulation, we show that neither banded nor circular banded matrices approximations work well for normalized CFO close to 0.5.<br />