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FPGA Implementation of GMSK Modulation

Fengping An

Abstract

GMSK is a spectrum-efficient modulation signal used widely in the FH communication system. In this paper, the design theory of GMSK modulator is analyzed and an improved digital implementation structure is obtained. Then this structure is imple-mented on FPGA. Simulation result show that GMSK signal generated by the digital implementation structure has nice PSD and eye pattern. Also, the effect of quadrature phase error and amplitude imbalance is avoided.

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Available abstract

Key concepts: Minimum-shift keying, Computer science, Field-programmable gate array, Modulation (music), SIGNAL (programming language), Quadrature amplitude modulation, Electronic engineering, Embedded system