基于多相扩频码的MC-CDMA信号峰平比抑制方法研究

张琛; 付耀文; 张尔扬

doi:10.3724/SP.J.1146.2006.00383

基于多相扩频码的MC-CDMA信号峰平比抑制方法研究

doi: 10.3724/SP.J.1146.2006.00383

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出版历程
- 收稿日期: 2006-03-29
- 修回日期: 2006-08-21
- 刊出日期: 2007-10-19

Reducing the Peak-to-Average Power Ratio of MC-CDMA Signal Using Polyphase Spreading Codes

摘要

摘要: 降低信号峰平比(PAPR)是多载波码分多址(MC-CDMA)系统的关键技术之一。该文推导了基于正交互补扩频码的MC-CDMA信号PAPR关系式；基于多相脉压码构造了可用于MC-CDMA系统的多相脉压扩频码集合；证明了多相脉压扩频码即为正交互补扩频码。仿真结果表明，各种输入信息调制方式下，大部分多相脉压扩频码比常用扩频码能进一步降低信号的PAPR，其中多电平调制方式下多相脉压扩频码的PAPR性能更优；在不同用户数情况下，多相脉压扩频码都是MC-CDMA系统扩频码的一个很好选择。
- 多载波码分多址;峰平比;多相扩频码
Abstract: Reducing the Peak-to-Average Power Ratio(PAPR) is one of the key technologies in MC-CDMA system. This paper derived the PAPR properties of MC-CDMA signal using orthogonal complementary spreading codes, constructed the polyphase spreading codes for MC-CDMA system using the polyphase pulse compression codes, and proved that they belonged to orthogonal complementary codes. The simulation results showed that under various modulation schemes, most polyphase pulse compression spreading codes could reduce PAPR when compared to traditional codes, especially under the multiple level modulation schemes and in different user number cases, polyphase spreading codes are good choices for MC-CDMA system.

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