Abstract
Introduction. This paper investigates a transmission system based on FBMC/OQAM multiplexing. This system is characterized by a high spectral efficiency, thereby attracting interest as an alternative transmission method in future wireless mobile communication standards. However, a disadvantage of the system is the high complexity of signal processing. There are numerous publications that study the FBMC/OQAM system from a theoretical perspective. This paper presents an experimental study of a transmission system based on FBMC/OQAM.Aim. Verification of a transmission system based on FBMC/OQAM multiplexing in a wireless channel.Materials and methods. Computer simulation modeling in Matlab and experimental research using Keysight and Rohde & Schwarz certified measuring instruments.Results. A model of synthesis and signal processing was developed, and a frame structure was proposed. The processing included synchronization, since the study was carried out in a wireless double-dispersive channel. Time synchronization was provided by the method of time-domain correlation. A preamble consisting of two symbols was used for CFO compensation. Channel estimation in FBMC/OQAM was conducted by pilot symbols spread over the time-frequency domain, a method with an auxiliary pilot to compensate for intrinsic interference, as well as Zero Forcing and a linear interpolator. As a result, dependences of the bit error rate on the Eb/N0 in various channels were obtained. An error rate of 10−4 was achieved under the Eb/N0 equal to 13.4 dB, 15.3 dB and 20.9 dB in the first, second and third channel, respectively.Conclusion. A FBMC/OQAM-based transmission system with a linear equalizer can operate without a cyclic prefix in a multipath wireless channel, providing comparable noise immunity to OFDM-CP. Long frames should be used to obtain greater spectral efficiency, due to the presence of a transition zone at the beginning and end of the FBMC/OQAM frame.
Highlights
This paper investigates a transmission system based on FBMC/OQAM multiplexing
На данном этапе создается нулевой вектор канальных коэффициентов для пилотных символов каждого слота
Analysis and design of OFDM/OQAM systems based on filterbank theory // IEEE transactions on signal processing. 2002
Summary
Rsr2x rs1rx m), m) где M – количество подканалов в преамбуле; m – индексы подканалов; rs1rx и rsr2x – первый и второй символы принятой преамбулы. Кадр FBMC/OQAM, разработанный для эксперимента, представлен на рис. При таких параметрах сигнала выигрыш в спектральной эффективности FBMC/OQAM Для оценки канала был использован метод Zero Forcing [15, 16], а также линейная интерполяция [17, 18]. 1. Оценка канала в пилотных ячейках методом Zero Forcing. На данном этапе создается нулевой вектор канальных коэффициентов для пилотных символов каждого слота Параметр Количество точек преобразования Фурье Полоса сигнала, МГц Тип манипуляции Циклический префикс Коэффициент перекрытия Длительность символа, отсчетов Шаг расположения пилотов по частоте (поднесущие) Шаг расположения пилотов по времени (символы). 8. Оценка канальных коэффициентов методом Zero Forcing и интерполяция по пилотным ячейкам. Для каждого сценария уровень выбирался таким образом, чтобы обеспечить коэффициент ошибок после приема и обработки сигнала в диапазоне 0.5 10−5.
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