This study proposes a simple scaling factor approach to improve the performance of parallel-concatenated convolutional code (PCCC) and serial concatenated convolutional code (SCCC) systems based on suboptimal soft-inp...This study proposes a simple scaling factor approach to improve the performance of parallel-concatenated convolutional code (PCCC) and serial concatenated convolutional code (SCCC) systems based on suboptimal soft-input soft-output (SISO) decoders. Fixed and adaptive scaling factors were estimated to mitigate both the optimistic nature of a posteriori information and the correlation between intrinsic and extrinsic information produced by soft-output Viterbi (SOVA) decoders. The scaling factors could be computed off-line to reduce processing time and implementation complexity. The simulation results show a significant improvement in terms of bit-error rate (BER) over additive white Gaussian noise and Rayleigh fading channel. The convergence properties of the suggested iterative scheme are assessed using the extrinsic information transfer (EXIT) chart analysis technique.展开更多
宫颈小细胞癌(small cell carcinoma of cervix,SCCC)是一种少见的宫颈神经内分泌癌,占宫颈癌1%~6%,常早期侵犯血管、盆腔淋巴结,发生远处器官转移,预后差,病死率高,5年生存率仅为14%~39%[1]。尽快明确诊断,并找到有效的治疗方法,对于改...宫颈小细胞癌(small cell carcinoma of cervix,SCCC)是一种少见的宫颈神经内分泌癌,占宫颈癌1%~6%,常早期侵犯血管、盆腔淋巴结,发生远处器官转移,预后差,病死率高,5年生存率仅为14%~39%[1]。尽快明确诊断,并找到有效的治疗方法,对于改善SCCC患者的预后有重要意义。本研究回顾性分析了2011年2月至2017年5月广西贵港市人民医院收治的18例SCCC患者的病例资料,分析总结其临床表现、病理特征、治疗方案及预后因素,以期能对SCCC的诊治提供参考,报告如下。展开更多
文摘This study proposes a simple scaling factor approach to improve the performance of parallel-concatenated convolutional code (PCCC) and serial concatenated convolutional code (SCCC) systems based on suboptimal soft-input soft-output (SISO) decoders. Fixed and adaptive scaling factors were estimated to mitigate both the optimistic nature of a posteriori information and the correlation between intrinsic and extrinsic information produced by soft-output Viterbi (SOVA) decoders. The scaling factors could be computed off-line to reduce processing time and implementation complexity. The simulation results show a significant improvement in terms of bit-error rate (BER) over additive white Gaussian noise and Rayleigh fading channel. The convergence properties of the suggested iterative scheme are assessed using the extrinsic information transfer (EXIT) chart analysis technique.
文摘宫颈小细胞癌(small cell carcinoma of cervix,SCCC)是一种少见的宫颈神经内分泌癌,占宫颈癌1%~6%,常早期侵犯血管、盆腔淋巴结,发生远处器官转移,预后差,病死率高,5年生存率仅为14%~39%[1]。尽快明确诊断,并找到有效的治疗方法,对于改善SCCC患者的预后有重要意义。本研究回顾性分析了2011年2月至2017年5月广西贵港市人民医院收治的18例SCCC患者的病例资料,分析总结其临床表现、病理特征、治疗方案及预后因素,以期能对SCCC的诊治提供参考,报告如下。
