{"title":"OVSF code allocation and two-stage combining method to reduce intercode interference in OFCDM system","authors":"Kazuhiko Hasegawa, Ryuichiro Shimura, Iwao Sasase","doi":"10.1002/ecja.20381","DOIUrl":null,"url":null,"abstract":"<p>In this paper, we propose an OVSF (Orthogonal Variable Spreading Factor) code allocation in OFCDM (Orthogonal Frequency and Code Division Multiplexing) system. In the proposed OVSF code allocation, codes which have a different ancestor code are allocated to users. When the proposed OVSF code allocation is used, a receiver can use a despreading which utilizes chips shorter than the spreading factor. Thus, symbols are generated. Furthermore, we propose a two-stage combining method. After first stage combining, by despreading, the symbols are multiplied by weights and combined in second stage combining. We show that the proposed scheme achieves better BER performance than the conventional scheme by computer simulations. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(9): 16– 24, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20381</p>","PeriodicalId":100405,"journal":{"name":"Electronics and Communications in Japan (Part I: Communications)","volume":"90 9","pages":"16-24"},"PeriodicalIF":0.0000,"publicationDate":"2007-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecja.20381","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electronics and Communications in Japan (Part I: Communications)","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ecja.20381","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
In this paper, we propose an OVSF (Orthogonal Variable Spreading Factor) code allocation in OFCDM (Orthogonal Frequency and Code Division Multiplexing) system. In the proposed OVSF code allocation, codes which have a different ancestor code are allocated to users. When the proposed OVSF code allocation is used, a receiver can use a despreading which utilizes chips shorter than the spreading factor. Thus, symbols are generated. Furthermore, we propose a two-stage combining method. After first stage combining, by despreading, the symbols are multiplied by weights and combined in second stage combining. We show that the proposed scheme achieves better BER performance than the conventional scheme by computer simulations. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(9): 16– 24, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20381
OFCDM系统中OVSF码分配和两段合并方法减少码间干扰
本文提出了一种正交频码分复用(OFCDM)系统中的OVSF(正交可变扩频因子)码分配方法。在建议的OVSF代码分配中，将具有不同祖先代码的代码分配给用户。当使用所提出的OVSF代码分配时，接收器可以使用比扩展因子短的芯片进行扩展。这样，符号就产生了。在此基础上，提出了一种两阶段组合方法。在第一阶段合并后，通过扩展，将符号乘以权值进行第二阶段合并。计算机仿真结果表明，该方案比传统方案具有更好的误码率性能。©2007 Wiley期刊公司电子工程学报，2009,29 (1):1 - 4;在线发表于Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002 / ecja.20381
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