| Summary: | 碩士 === 國立交通大學 === 電信工程系 === 90 === In this paper, an alternative approach for the design of an IEEE 802.11a standard digital IF up/down converter is presented. The signal up or down conversion are achieved by integrating half-band filter architecture with polyphase decomposition technique used in multi-rate signal processing. According to multi-rate system theory, while on the one hand, the signal sampling frequency can be increased four times by interpolation, on the other hand, the ADC output signal sampling frequency can be decreased four times by decimation. At the same time, we apply the theory of time shift and frequency shift to realize the conversion between baseband and low IF.
This paper also addresses efficient implementation of the up/down converter architecture. By means of an unconventional number representation and high-rate compressor, the power consumption and the complexity of circuits can be decreased significantly. Furthermore, applying the interleaving method to simplify the structure, better resource sharing can be achieved and accordingly the implementation cost can be reduced.
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