JTIDS系统的多进制扩频检测方法和软输出算法  

Detection Methods and Soft-output Algorithms for M-ary Spread Modulation in JTIDS

作　　者：徐信[1] 

机构地区：[1]济南军区通信网络技术管理中心,山东济南250002

出　　处：《无线电通信技术》2013年第5期37-40,共4页Radio Communications Technology

摘　　要：提出了使用FIR匹配滤波器的多进制扩频检测方法,阐明了FIR匹配滤波器输出相关值与传统多路相关器输出相关值的一致性和理论依据,给出了多进制扩频检测的2种比特软值输出计算方法,针对JTIDS系统RS编码只能硬判译码问题给出了相应的改进方案。通过计算机仿真优选出了16位循环移位扩频码,仿真比较了RS编码系统和32位、16位扩频码的(64,57)TPC编码系统的误比特率性能,验证了比特软值输出迭代译码的有效性。Two detection methods with FIR filter for M-ary spread modulation are proposed. We clarify the base theory and the consistency between traditional correlator and FIR match filter. Two bit soft output algorithms are presented. Aiming at the problem that JTIDS RS coding can but implement hard decision decoding,a corresponding improvement scheme is proposed. The 16-bit circular shift spread codes are selected by computer simulation. In the simulation,the bit error rate of RS coding system and TPC coding system of 32-bit and 16-bit spread codes are compared to validate the availability of bit soft output iterative decoding.

关 键 词：联合战术信息分发系统 数据链 多进制扩频 比特软值 TURBO乘积码 

分 类 号：TN914.42[电子电信—通信与信息系统]