The Design of WCDMA Digital Intermediate Frequency Transmitter
Sun Fan-bo · Yuhang jice jishu · 2010
This paper proposes a new structure of digital intermediate frequency transmitter based on the software defined radio:using root raised cosine filter,half-band filter and cascaded integrator Comb filter in interpolation and filter design,combine three carriers in digital domain and adopt Crest Factor Reduction(CFR) and Digital Pro-distortion(DPD) technology to optimize the signal quality.This new structure improve the designing flexibility and lower the requirement of PA linearity.The simulation result using matlab demonstrate that:main performance index Adjacent Channel Leakage Ratio(ACPL)improve 20 dB and 18 dB at 5 MHz and 10 MHz respectively,reach to-58 dBc and-60 dBc,and meet the demands of 3GPP protocol.