CAJ | 학술논문

在译码转发中继系统中,非规则重复累积(IRA)码的设计本质是设计码率兼容IRA码.由于通过校验分裂得到的码字的不同部分经历不同的信噪比,因此给出了基于校验分裂的修正的高斯近似的密度进化算法来分析IRA码的门限并且用差分进化算法对其优化.实验仿真证明与传统的密度进化算法得到的IRA码相比,当误帧率是10~(-3)时,优化得到的码字大约有0.5dB的增益.
재역마전발중계계통중,비규칙중복루적(IRA)마적설계본질시설계마솔겸용IRA마.유우통과교험분렬득도적마자적불동부분경력불동적신조비,인차급출료기우교험분렬적수정적고사근사적밀도진화산법래분석IRA마적문한병차용차분진화산법대기우화.실험방진증명여전통적밀도진화산법득도적IRA마상비,당오정솔시10~(-3)시,우화득도적마자대약유0.5dB적증익.
In essence, rate compatible IRA codes for decode-and-forward (DF) relay was designed. The different code segments of the rate-compatible IRA code via check splitting experience different SNRs. So, a modified density evolution with Gaussian approximation based on check splitting was proposed to analyze the threshold of IRA codes. Then the code ensembles were optimized using a modified differential evolution procedure. Simulations are carried out to demonstrate that the optimized codes achieve about 0.5dB gain over conventional IRA codes when the frame error rate is 10~(-3).