OFDM系统中基于遗传算法的SR-NYQ脉冲成形滤波器设计

doi:10.3969/j.issn.0255-8297.2025.05.002

Abstract

Abstract: In band-limited digital communications, square-root Nyquist (SR-NYQ) filters are commonly applied at both the transmitter and receiver to effectively mitigate sampling inter symbol interference (ISI). This paper proposes a novel design method for linear-phase SR-NYQ filters based on genetic algorithms (GA), in which the fitness function consists of key performance metrics including ISI, passband ripple and stopband ripple. Due to the excellent global optimization capability of GA, the proposed method enables a closer approximation to the ideal Nyquist condition while providing additional design flexibility. To evaluate performance, the proposed SR-NYQ filter is compared with the conventional root raised cosine filter within an orthogonal frequency division multiplexing (OFDM) system. Simulation results demonstrate that the SR-NYQ filter designed using the proposed method achieves a superior frequency response and significantly reduces the symbol error rate (SER).

Key words: square-root Nyquist (SR-NYQ), genetic algorithm (GA), filter design, orthogonal frequency division multiplexing (OFDM)

CLC Number:

P751.1

LI Yijing, WEN Jiangang, ZOU Yuanping, HUA Jingyu, SHENG Bin. GA-Based Design of SR-NYQ Pulse Shaping Filter for OFDM Systems[J]. Journal of Applied Sciences, 2025, 43(5): 730-739.

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GA-Based Design of SR-NYQ Pulse Shaping Filter for OFDM Systems

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