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Coded overlapped code division multiplexing system with Turbo product structure

ISSN号：1005-8885
期刊名称：《中国邮电高校学报：英文版》
时间：0
分类：TN911.22[电子电信—通信与信息系统;电子电信—信息与通信工程] TN949.197[电子电信—信号与信息处理;电子电信—信息与通信工程]
作者机构：[1]School of Information and Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
相关基金：This work was supported by the National Natural Science Foundation of China （90604035）.

关键词：格状编码调制, 复用系统, 产品结构, 码分, 涡轮, 代码复用, 比例系统, 矩阵转化, overlapped code division multiplexing, trellis coded modulation, TPC-OVCDM, iterative decoding

中文摘要：

有涡轮产品结构(TPC-OVCDM ) 的编码重叠代码部门 multiplexing 系统被介绍，并且架子编码了调整(TCM ) 当错误改正，代码被采用为未加码的重叠代码部门 multiplexing (OVCDM ) 的代码系统。在如此的一个计划，行代码和列代码分别地是 TCM 和 OVCDM 传播代码。数据位被 TCM 仅仅直接编码并且转变了成一个矩阵。这个矩阵的每列然后被标志 interleaver 在被散布代码的 OVCDM 编码前变更。在在接收装置的反复的译码的过程期间，二个成分解码器在日志域由标志 BCJR 算法使用标志。译码二亚代码的顺序被编码顺序决定。TCM 编码并且 OVCDM 编码的比例影响系统性能。为编码结构和标志 interleaver 修理，添加剂白人 Gaussian 噪音(AWGN ) 的不同比例的 TPC-OVCDM 系统的性能隧道被模仿了。结果证明合理比例的那个 TPC-OVCDM 系统能完成重要编码获得，与在一样的条件下面的未加码的 OVCDM 系统相比光谱以小点错误率(BER ) 的效率 10 的水平 ? 5

英文摘要：

Coded overlapped code division multiplexing system with Turbo product structure （TPC-OVCDM） is introduced, and trellis coded modulation （TCM） code is employed as error correcting code for uncoded overlapped code division multiplexing （OVCDM） system. In such a scheme, row code and column code are TCM and OVCDM spreading code, respectively. Data bits are only encoded directly by TCM and transformed into a matrix. Each column of this matrix is then permuted by symbol interleaver before being encoded by OVCDM spreading code. During iterative decoding process in the receiver, two constituent decoders use symbol by symbol BCJR algorithm in the log domain. The order of decoding two sub-codes is determined by the encoding order. The proportion of TCM coding and OVCDM coding affects system performance. For fixed coding structure and symbol interleaver, the performance of TPC-OVCDM systems of different proportions of additive white Gaussian noise （AWGN） channel have been simulated. The results show that TPC-OVCDM system of reasonable proportion can achieve significant coding gain, compared with uncoded OVCDM system under the condition of same spectral efficiency at bit error rate （BER） level of 10^-5.

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