Estimación de interferencia y ruido en un sistema OFDM

• Main Authors: SUTIVONG, Arak, AGRAWAL, Avneesh, NAGUIB, Ayman
• Format: Patent
• Language: Spanish
• Published: 11.04.2019
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MULTIPLEX COMMUNICATION; PHYSICS; TESTING; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

Un procedimiento para estimar el ruido en un sistema de multiplexación por división de frecuencia ortogonal, OFDM, (200), el procedimiento que comprende: recibir símbolos OFDM; detectar una potencia recibida de una señal en una banda de frecuencias de subportadora no asignada; y caracterizado por: calcular un promedio ponderado de la potencia recibida con al menos una medición de potencia recibida almacenada previamente para la banda de frecuencias de subportadora no asignada, en el que una ponderación para el promedio ponderado se basa en una antigüedad de al menos una medición de potencia recibida almacenada previamente. Noise and interference can be independently measured in a multiple user Orthogonal Frequency Division Multiplexing (OFDM) system. Co-channel interference is measured in a frequency hopping, multiple user, OFDM system by tracking the sub-carriers assigned to all users in a particular service area or cell. The composite noise plus interference can be determined by measuring the amount of received power in a sub-carrier whenever it is not assigned to any user in the cell. A value is stored for each sub-carrier in the system and the value of noise plus interference can be a weighted average of the present value with previously stored values. The noise component can be independently determined in a synchronous system. In the synchronous system, all users in a system may periodically be prohibited from broadcasting over a sub-carrier and the received power in the sub-carrier measured during the period having no broadcasts.