802.16e标准中FEC编码技术研究  

Research on forward error correction coding for IEEE 802.16e standard

作　　者：杨天扬[1] 许卫东[2] 黄建华[1] 

机构地区：[1]华东理工大学信息科学与工程学院,上海200237 [2]西安电子科技大学通信工程学院,西安710071

出　　处：《铁路计算机应用》2008年第8期45-49,共5页Railway Computer Application

摘　　要：主要研究集中在IEEE802.16e标准的前向纠错—FEC编码及其实现。所研究的系统环境为标准中的OFDMA物理层的上行链路部分(WirelessMAN-OFDMA),所研究的编码为卷积码(CC)和卷积Turbo码(CTC),并用C语言设计这两种编码方案的实现程序。对所设计的程序进行验证测试结果表明:符合IEEE802.16e标准的FEC编码的CC和CTC编码方案的实现设计是成功的。通过比较可以看出,虽然CC码在高码率情况下误码率明显不如CTC码,不过CC码的编码过程相对CTC码而言要简单得多。在低码率且信道情况相对尚可的情况下,可考虑采用CC码以节约信道编码的复杂度;而在码率较高或者对误码率要求严格时,应选用CTC码的方案以保证通信质量。In this paper the broadband wireless access system provided by the IEEE 802.16e wireless MAN air interface was addressed. The investigations were focused on Forward Error Correction （FEC） encoding within uplink of the WirelessMANOFDMA physical layer of IEEE 802.16e. The encoder of convolutional code （CC） and convolutional turbo code （CTC） were designed and completed in the software of Visual C＋＋. The programme of two FEC encoders was proved to be available and useful at last. Through the comparion, we could summarize as follow, when used high code rate, the bit error rate of CC code was obviously higher than that of CTC code. In the other hand, to achieve the encoder in CTC code was quite more complex than in CC code. CC code should be used when low code rate and loose error rate requirement, to save the complexity of channel coding. CTC code should be used when high code rate and strict error rate requirement, to ensure the communication quality.

关 键 词：IEEE 802.16e 卷积码(CC) 卷积Turbo码(CTC) 研究 

分 类 号：TP39[自动化与计算机技术—计算机应用技术] U698.6[自动化与计算机技术—计算机科学与技术]