| Summary: | 碩士 === 中原大學 === 電子工程研究所 === 90 === The objective of the IMT-2000 system drawn up by ITU is to establish a seamless third generation mobile communication standard with the function of global roaming across any systems and networks. Software defined radio technique migrates the traditional hardware radio platforms to flexible software radio platforms that can support multiple air interface standards. In this thesis, we design a multi-mode digital IF downconverter for GSM、IS-95 and W-CDMA systems based on the concept of software defined radio.
In this thesis, we design an efficient IF processing architecture that can support multi-mode application via the download parameters. The high resolution Numerical Controlled Oscillator (NCO) allows carrier channels to be selected from a wide frequency band. The high efficient Cascaded Integrator Comb (CIC) filters with wide range interpolation /decimation rate can extract both desired narrowband and wideband signals. The programmable Finite Impulse Response (FIR) filter aims to reject the out of band signal. Furthermore, this thesis also uses fixed-point simulation to predict the errors caused by truncation, quantization, round-off and overflow for finite wordlength processing. Finally, we adopt hardware description language ‘VHDL’ for RTL design, and use Altera Max+PlusII development software to accomplish logic synthesis, circuit place & route and timing verification to complete the multi-mode digital IF downconverter design.
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