一种新的正交多载波CDMA系统
A NEW ORTHOGONAL MULTICARRIER CDMA SYSTEM
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摘要: 该文提出了一种新的多载波码分多址(MC-CDMA)系统。与传统的MC-CDMA系统相比,其主要区别是要发送的数据比特先串并转换为多个并行分支,每一个分支用一组正交子载波进行调制。在每个分支上,使用相同扩频序列的不同码片调制子载波。这种系统能更有效地利用传输带宽,实现频率分集。由于该系统降低了每个子载波上的数据速率,扩频序列更容易同步。最后给出了在瑞利衰落信道下的性能分析。
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关键词:
- 多载波; 码分多址; 瑞利衰落
Abstract: In this paper, a new multicarrier MC-CDMA system is proposed. Comparing with the conventional MC-CDMA system, the difference is that transmitted data bits are serial to parallel converted to a number of parallel branches first, then each branch is modulated using a group of orthogonal subcarriers. Noted that on each orthogonal subcarrier branch, transmitted data bit after serial to parallel converted is modulated with a chip of a PN(Pseudorandom Number) sequence, not a whole PN sequence. This system can utilize the transmission bandwidth more efficiently and achive frequency diversity. Furthermore, this system lowers the data rate of each carrier branch, so it is easier to make PN sequence synchronized. The performance of the system is analysed in a Rayleigh fading channel. -
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