A Multi-Code Biorthogonal Code Keying with Constant Amplitude Coding(Wireless Communication Technologies)
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概要
- 論文の詳細を見る
Orthogonal modulation provides low probability of bit error, however its bandwidth efficiency is very low. Biorthogonal code may double the bandwidth efficiency, but its required bandwidth grows exponentially with the number of input bits as in orthogonal modulation. In this paper, we propose a multi-code biorthogonal code keying (MBCK) scheme that significantly reduces the signal bandwidth with the benefit from orthogonal waveform coding maintained. The system consists of multiple waveform coding blocks, and the sum of output codewords is transmitted. A problem with MBCK is that output signal is multi-level, which requires amplifier with high linearity. So it may not be an appropriate scheme for portable unit where power efficiency is highly important. We also propose a modified MBCK scheme that guarantees constant amplitude output. The transmitter of the proposed scheme contains a redundant waveform coder whose input is generated by encoding the information bits. Adding the codewords from all constituent waveform coding blocks, the composite signal has constant amplitude. It is also shown that the redundant bits are not only used to make constant amplitude signal but also used to improve the BER performance at the receiver.
- 社団法人電子情報通信学会の論文
- 2005-07-01
著者
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Kim Sung
Department of Bioengineering and Technology, College of Engineering, Kangwon National University
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Kim Myoung
Department Of Neurosurgery Seoul Paik Hospital Inje University College Of Medicine
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Cho Jin
Wireless Network Research Center Korea Electronics Technology Institute
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Kim Sung
Department Of Anatomy
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Kim Myoung
Department Of Computer Science Kaist
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Kim Myoung
Department Of Information And Communications Engineering Hankuk University Of Foreign Studies
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Kim Sung
Department Of Information And Communications System Engineering Korea Information And Communication
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Kim Myoung
Department Of Anesthesiology Paik Hospital Inje University
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Kim Sung
Department of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic of Korea
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Kim Sung
Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi 446-701, Republic of Korea
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