Optical CDMA with Multibit Code for Many Multiplex Users

为许多多路复用用户提供多位代码的光 CDMA

• 批准号: 09650397
• 负责人: YASHIMA Hiroyuki
• 金额: $ 1.98万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650397/
• 关键词: Optical Communication; Optical CDMA; error control code; PPM; convolutional code; Viterbi decoding; 音声; 多重通信

1. Multibit Code for Optical CDMAWe have proposed a new class of code as signature sequences for optical Code Division Multiple Access (OCDMA) systems. OCDMA combined with F-ary Multibit/Sequence period has been investigated. We derive the performance of the proposed CDMA systems. It is shown that the proposed system achieves higher throughput, keeping advantage of the power efficiency and low bit error rate performances.2. M-ary PPM with Multibit codeThe multibit/Sequence period code has been applied in OCDMA with M-ary Pulse Position Modulation (PPM). In PPM signaling, interference from other users are reduced, which results in increase of simultaneous users. It is found that the proposed system achieves higher throughput, keeping advantage of low bit error rate.3. OCDMA with Error Control CodingWe apply error control coding to improve the system performance of pulse position modulated OCDMA (PPM/OCDMA) systems and we investigate the performance of M-ary PPM/OCDMA systems with M-ary … More convolutional coding. Dual-k code is used as the M-ary convolutional code and Optical Orthogonal Codes with the maximum cross correlation value of 1 and 2 are employed as the signature sequences. We derive an expression for the bit error probability of the new system and show that combining M-ary convolutional coding and M-ary PPM results in an improved error performance. Also it is shown that the number of simultaneous user can be significantly increased with the proposed system compared to the uncoded PPM/OCDMA system with the same bit error probability and with the same information bit rate. We also analyze the system with binary convolutional coding and a comparison with the proposed system is given.4. OCDMA with Prime CodeWe investigate the performance of prime code in OCDMA systems. The correlation properties of primecode to derive BER in OCDMA. The value of the crosscorrelation between prime codes and its probability density function are analyzed. Bit error rate (BER) are, then, derived for the case of the worst choice of codes and also for the case of random choice. Simulation results show that the results obtained in the analysis provides well approximated BER. BER for prime code is compared with that for optical orthogonal code (OOC). IT is shown that prime code provides better performance than the OOC. Less

1.提出了一种新的光码分多址（OCDMA）系统的特征码序列。研究了F进制多比特/序列周期光码分多址（OCDMA）系统。我们推导出建议的CDMA系统的性能。结果表明，该系统在保持功率效率和低误码率性能的同时，获得了较高的吞吐量.多比特/序列周期码在多进制脉冲位置调制（PPM）光码分多址（OCDMA）中得到了应用。在PPM信令中，减少了来自其他用户的干扰，从而导致同时用户的增加。实验结果表明，该系统在保持低误码率的同时，获得了较高的吞吐量.采用差错控制编码的光码分多址（OCDMA）我们采用差错控制编码来改善脉冲位置调制光码分多址（PPM/OCDMA）系统的性能，并研究了M进制PPM/OCDMA系统的性能 ...更多信息 卷积编码双k码被用作M元卷积码，并且具有最大互相关值1和2的光正交码被用作签名序列。我们推导出一个表达式的新系统的比特错误概率，并表明相结合的M-ary卷积编码和M-ary PPM的结果在一个改进的错误性能。此外，它示出的同时用户的数量可以显着增加与建议的系统相比，未编码的PPM/OCDMA系统具有相同的误码率和相同的信息比特率。我们还分析了系统与二进制卷积编码和比较所提出的系统.研究了素数码在OCDMA系统中的性能。OCDMA中主码的相关特性对误码率的影响。分析了素数码间的互相关值及其概率密度函数。误码率（BER），然后，推导出的情况下，最坏的选择的代码，也为情况下的随机选择。仿真结果表明，在分析中得到的结果提供了很好的近似BER。比较了素数码与光正交码的误码率。它表明，素数码提供了更好的性能比OOC。少

项目成果

S.Nanao, H.Yashima, J.Suzuki and T.Ohtsuki: "Optical PPM-CDMA Systems Using EWOC"1997 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing. vol.1. 14-17 (1997)

S.Nanao、H.Yashima、J.Suzuki 和 T.Ohtsuki：“使用 EWOC 的光学 PPM-CDMA 系统”1997 年 IEEE 环太平洋通信、计算机和信号处理会议。

PASQUAL H.and YASHIMA H.: "Analysis of Optical PPM/CDMA System with M-ary Convolutional Coding" Int.Symp.on Information Theory and its Applications. Vol.2. 518-521 (1998)

PASQUAL H. 和 YASHIMA H.：“采用多进制卷积编码的光学 PPM/CDMA 系统分析”Int.Symp.on 信息论及其应用。

七尾慎司,八嶋弘幸,鈴木誠史: "EWO符号とRTTを用いた畳み込み符号化光CDMA通信システム" 電子情報通信学会、基礎・境界ソサイエティ大会講演論文集. 101 (1998)

Shinji Nanao、Hiroyuki Yashima、Makoto Suzuki：“使用 EWO 代码和 RTT 的卷积编码光学 CDMA 通信系统”，IEICE 基础与边界学会会议记录，101 (1998)

Y.Shimura, H.Yashima, and J.Suzuki: "Bit Error Rate of RCPC Coded Optical PPM with Diversity Combining" Proc. Inter. Symp. Nonlinear Theory and Its Applications. Vol.1. 109-112 (1997)

Y.Shimura、H.Yashima 和 J.Suzuki：“采用分集组合的 RCPC 编码光学 PPM 的误码率”Proc。

志村弦,八嶋弘幸,鈴木誠史: "プライム符号の相互相関特性の解析と光CDMAシステムにおけるビット誤り率" 電子情報通信学会論文誌. J81A.10. 1431-1441 (1998)

Gen Shimura、Hiroyuki Yashima、Masashi Suzuki：“光学 CDMA 系统中质数码和误码率的互相关特性分析”IEICE Transactions J81A.10 (1998)。