IIIE   20352
INSTITUTO DE INVESTIGACIONES EN INGENIERIA ELECTRICA "ALFREDO DESAGES"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
CFO Compensation for OFDMA Systems Using Circular Banded Matrices
Autor/es:
GUSTAVO J. GONZÁLEZ; FERNANDO H. GREGORIO; JUAN E. COUSSEAU
Lugar:
Oro verde, Entre Ríos
Reunión:
Congreso; XIV Reunión de Trabajo en Procesamiento de la Información y Control (RPIC); 2011
Institución organizadora:
Facultad de Ingeniería de la Universidad Nacional de Entre Ríos
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 is impossible to recover 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.