一种用于军事光纤通信系统的新型前向纠错码的研究

An investigation on a new type of forward error-correcting code which applied in military fiber communication system

光纤信道具有比传统电缆信道更高的信号传输速率和更大的带宽,当采用光纤调制解调器进行电光信号转换时,可以使用具有较多冗余位的编码方式来保证信号传输的准确性和可靠性。论文研究了一种以BCH作内码、Hamming码作外码的新型前向纠错码,该码使用三级编码和两次交织技术构成了串行级联线性码,可以有效地将信号传输过程中所产生的较长突发错误交织成较短的随机错误,并使交织后可能出现的误码个数在所设计编码的纠错能力范围内,从而可在译码时实时地纠正这些错误。论文探讨了这种前向纠错码的编、译码算法,采用了软硬件较易实现的逐步判决逐步译码算法。计算机模拟结果表明该级联码具有较强的纠错功能,可应用于对信号传输的准确性和实时性都具有特殊要求的军事光纤通信系统。

Fiber channel possesses wider bandwidth and higher signal transmission speed than traditional cable channel,which permits the encoder adding more redundant bits in encoding process when the electric signals convert into optical signals by an optic modern to guarantee the reliability and veracity of the communication system.A new type forward error-correcting code with more redundant bits was designedin this paper and its encoding and decding algorithm is studied.The code sdopted BCH code as the inner code while Hamming code as outer code.The three-level encoding and twice in terleaving technology was used in the encoder and a new serial concatenated block code was constructed.The long and burst bits error of the transmission information bits that produced in channel could be effectively changed into the short and random bits errir by this encoding moder and the number of error bits is confined in the crror-correcting range of the decoder,which means that all error bits that produced in transmission process can be corrected at the information terminal in real time.The computer sinulating results have proven that this code possessed much fine error correcting performance and can be widely applied in the military fiber communication system that has special requirements on file veracity and the ereliahility of information transmission.