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首页> 外文期刊>電子情報通信学会技術研究報告. 情報理論. Information Theory >A Note on Orthogonal Variable Spreading Factor Codes Based on Polyphase Sequences
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A Note on Orthogonal Variable Spreading Factor Codes Based on Polyphase Sequences

机译：基于多相序列的正交可变扩散因子码的注意事项

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摘要

Orthogonal variable spreading factor (OVSF) codes, which consist of binary sequences with variable lengths, are proposed to support multi-user/multi-rate data transmission services in DS-CDMA systems. A useful property of OVSF codes is that no two code sequences assigned to different users will ever interfere with each other, even if their spreading factors are different. Conventional OVSF codes are constructed based on binary orthogonal codes, called Walsh codes. Recently, the authors proposed new OVSF codes that are constructed based on polyphase orthogonal codes. The proposed codes consist of complex sequences with variable lengths. In this paper, basic properties of the proposed OVSF codes are investigated. It is shown that the proposed codes are well suited to multi-user/multi-rate DS-CDMA systems using a non-binary phase modulation scheme, such as ternary phase, quadrature phase, and other multiphase shift keying schemes, and that they suppress the level fluctuations of transmission signal envelope.
机译：由具有可变长度的二进制序列组成的正交可变扩展因子（OVSF）代码，以支持DS-CDMA系统中的多用户/多速率数据传输服务。 OVSF代码的有用属性是，即使它们的传播因素不同，也不会分配给不同用户的两个代码序列。传统的OVSF代码基于二进制正交代码构建，称为沃尔什代码。最近，作者提出了基于多相正交码构建的新型OVSF代码。所提出的代码由具有可变长度的复杂序列组成。本文研究了所提出的OVSF代码的基本性质。结果表明，使用非二进制相位调制方案（例如三元相位，正交阶段和其他多相移位键控方案）非常适合于多用户/多速率DS-CDMA系统，并且它们抑制传输信号包络的水平波动。

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