CAJ | 학술논문

针对低密度奇偶校验码(LDPC)译码器性能受输入软信息电平抖动影响较大的问题,本文提出一种基于自动增益控制(AGC)方法的输入匹配电路,能够跟踪输入的信号电平变化动态调整信号幅度,使解调器与LDPC译码器始终工作在最佳匹配状态.此方法及AGC结构匹配电路模块已用于实现高速超宽带(MBOK-UWB)无线通信系统接收机的LDPC译码器,系统仿真和实际测试结果均表明,上述方法有效提高了系统的误比特性能.
침대저밀도기우교험마(LDPC)역마기성능수수입연신식전평두동영향교대적문제,본문제출일충기우자동증익공제(AGC)방법적수입필배전로,능구근종수입적신호전평변화동태조정신호폭도,사해조기여LDPC역마기시종공작재최가필배상태.차방법급AGC결구필배전로모괴이용우실현고속초관대(MBOK-UWB)무선통신계통접수궤적LDPC역마기,계통방진화실제측시결과균표명,상술방법유효제고료계통적오비특성능.
The performance of Soft-decision LDPC decoders will be significantly degraded due to variation of signal level of input data. To avoid the degradation, a digital AGC as the input-matching circuit for the LDPC decoder is proposed in this paper to track the variation of the signal level and amplify the input data correspondingly. A low-complexity architecture, suitable for high-speed applications in particular, is also presented and analyzed. The FPGA implementation of the AGC in a high-speed UWB communication system shows significant performance improvement with very low hardware cost, thus the proposed AGC input-matching circuit is considered to be useful for applications with LDPC or other soft-decision CODEC