Multi-Mode Digital IF Downconverter for Software Radio Application(<Special Issue>Software Defined Radio Technology and Its Applications)

概要

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The software-defined radio technique translates the traditional hardware radio platform to a flexible software radio platform that can support multiple air interface standards This work proposes an efficient IF processing architecture based on software-defined radio for 2G GSM/IS-95 and 3G W-CDMA systems Hardware complexity is estimated by fixed-point simulation IF processing architecture should be highly flexible and minimally complex Firstly, a carrier channel is selected from a wide frequency band using a high-resolution numerically controlled oscillator (NCO) Wide-range interpolation/decimation is performed by the cascaded integrator comb (CIC) filter that involves no multiplier nor stores filter coefficients Both the desired narrowband and the desired wideband signals can be extracted The look-up table (LUT), based on the distributed arithmetic (DA) algorithm is used to implement the finite impulse response (FIR) filter Therefore, a small area and high speed can be achieved The errors caused by truncation, quantization, roundmg-off and overflow are predicted using a fixed-point simulation These predictions will help to evaluate the word-length for VLSI implementation Finally, ALTERA APEX20KE is used as a target device One hundred thousand gates are used for the implementation Thus, the proposed architecture has high processing flexibility and small area
社団法人電子情報通信学会の論文
2003-12-01