Prototype filter fixed-point implementation method based on OQAM-FBMC (Offset Quadrature Amplitude Modulation-Filter Bank Multi-Carrier) system

Abstract

The invention discloses a prototype filter fixed-point implementation method based on an OQAM-FBMC (Offset Quadrature Amplitude Modulation-Filter Bank Multicarrier) system. The method adopts a transmitting part and a receiving part; the transmitting part firstly partitions a complex signal into a real part signal and an imaginary part signal by an OQAM preprocessing module, then expands a frequency domain and carries out pulse shaping by an iFFT-PPN (Inverse Fast Fourier Transform-Poly Phase Network) synthesis filter bank module, and finally carries out parallel-serial conversion; and the receiving part corresponds to part of flow of the transmitting part, firstly, carries out parallel-serial conversion, then processes by an FFT-PPN analysis filter, and finally, completes regeneration of an original signal by an OQAM post-processing module. According to the prototype filter fixed-point implementation method disclosed by the invention, by carrying out simulation analysis on a wireless access system, introducing each functional module, carrying out fixed-point implementation on a filter bank and acquiring optimal fixed point numbers of a Phydyas fitler bank in different channel environments, the theoretical basis is provided for hardware implementation, hardware cost and signal transmission energy consumption can be greatly saved in the engineering application.

Description

technical field [0001] The invention belongs to the field of wireless communication system algorithms, and in particular relates to a fixed-point realization method of a prototype filter based on an OQAM-FBMC system. Background technique [0002] In today's communication industry, wireless communication is undoubtedly the fastest growing segment. The rapid increase in the number of users, the greatly improved communication rate requirements, and the emergence of a wide variety of wireless communication applications all require more efficient and flexible wireless access technologies to support. In the past fifteen years, Orthogonal Frequency Division Multiplexing (OFDM, orthogonal frequency division multiplexing) technology has extremely low complexity, high spectrum utilization rate and extremely high efficiency for MIMO systems due to its simple equalization technology and FFT application. High applicability and many other advantages, and as the most optimized multi-carri...

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Problems solved by technology

However, with the continuous development of wireless communication technology and requirements, some disadvantages of OFDM, such as high sidelobe caused by rectangular pulse shaping, sensitivity to carrier frequency offset and dual dispersion channel, and spectral distortion caused by the introduction of cyclic prefix Efficiency reduction and higher power peak-to-average ratio, etc., are also increasingly amplified

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