CAJ | 학술논문

基于软件无线电技术的设计理念,提出了一种新型的WCDMA数字中频发信机结构:内插和滤波设计中采用根升余弦数字滤波器(RRC)、半带滤波器(HB)以及积分梳状滤波器(CIC)三者相结合的方式,在数字域进行三载合路,并使用削峰和数字预失真技术对信号进行优化处理.新型结构使得设计灵活性更大,对射频功放线性度要求更低.关键模块的Matlab仿真结果表明,三载波主要性能指标邻道泄露比(ACLR)在5MHz和10MHz处改善度分别为20dB和18dB,达到-58dBc和-60dBc,完全满足3GPP协议的设计要求.
기우연건무선전기술적설계이념,제출료일충신형적WCDMA수자중빈발신궤결구:내삽화려파설계중채용근승여현수자려파기(RRC)、반대려파기(HB)이급적분소상려파기(CIC)삼자상결합적방식,재수자역진행삼재합로,병사용삭봉화수자예실진기술대신호진행우화처리.신형결구사득설계령활성경대,대사빈공방선성도요구경저.관건모괴적Matlab방진결과표명,삼재파주요성능지표린도설로비(ACLR)재5MHz화10MHz처개선도분별위20dB화18dB,체도-58dBc화-60dBc,완전만족3GPP협의적설계요구.
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 20dB and 18dB at 5MHz and 10MHz respectively,reach to 58dBc and 60dBc, and meet the demands of 3GPP protocol.