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Error correcting capability of constant amplitude coding for orthogonal multi-code cdma systems

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 1998年第10期E81A卷 2166-2169页

作者： Wada, T Yamazato, T Katayama, M Ogawa, A Nagoya Univ Sch Engn Dept Informat Elect Nagoya Aichi 4648603 Japan

In this paper, we discuss the error correcting capability of the constant amplitude coding. In orthogonal multicode cdma systems, the transmitted signal has large amplitude fluctuation and the amplitude fluctuation causes large nonlinear distortion. In order to avoid the amplitude fluctuation, we have proposed "constant amplitude coding" in our previous study. The constant amplitude coding can achieve constant amplitude transmission by utilizing the redundancy of the coding, i.e., the coding can have an error correcting effect. In this paper, we examine the effectiveness of the error correcting capability of the constant amplitude coding and show that the constant amplitude coding is very effective against nonlinear distortion under the consideration of the error correcting capability.

关键词： orthogonal multi-code cdma systems constant amplitude coding nonlinear distortion error correcting capability

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A constant amplitude coding for orthogonal multi-code cdma systems

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 1997年第12期E80A卷 2477-2484页

作者： Wada, T Yamazato, T Katayama, M Ogawa, A Nagoya Univ Sch Engn Dept Informat Elect Nagoya Aichi 46401 Japan

In this paper, we present orthogonal multi-code cdma systems with the constant amplitude transmission. In general, the dynamic range of the amplitude of the transmitting signal is very large in the case of orthogonal multi-code cdma systems. In order to realize the constant amplitude transmission for orthogonal multi-code cdma systems, we propose a constant amplitude coding. First, we show the basic concept of the constant amplitude coding. And then, we show that the constant amplitude transmission can be realized by the combination of the conventional orthogonal multi-code cdma and the constant amplitude coding. Finally, the effectiveness of the proposed method is evaluated in terms of the bit error rate performance and it is shown that the proposed method is robust to the non-linear distortion caused by a high power amplifier (HPA).

关键词： orthogonal multi-code cdma systems constant amplitude coding Hadamard code sequences non-linear amplifier

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