Asynchronous multicarrier DS-CDMA using mutually orthogonal complementary sets of sequences
Asynchronous multicarrier DS-CDMA using mutually orthogonal complementary sets of sequences
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DOI：
10.1109/26.818873
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
S. Tseng;M. Bell
中科院分区：
文献类型：
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作者：
S. Tseng;M. Bell
研究了多载波码分多址（CDMA）系统中每个用户使用多个扩频序列的问题。假设每个用户具有不同的扩频序列集合，每个用户集合中的每个载波具有不同的扩频序列。我们表明，当这些序列集被选为相互正交（MO）互补序列集，多址干扰是最小的非衰落信道上。由于MO互补序列的自相关旁瓣消除特性，有可能在非衰落信道上将符号更紧密地打包在一起，从而导致比对每个载波使用相同扩展序列的多载波CDMA中更高的数据速率。由此产生的通信系统方案的结果在一个容易并行化的接收机架构，可能是有用的非衰落相干信道，如光纤信道或莱斯信道与一个强大的视线组件。在瑞利衰落信道上，该系统的性能与每个用户采用单个扩频序列的多载波CDMA相同，而接收机复杂度只有很小的增加。
The use of sets of multiple spreading sequences per user in multicarrier code-division multiple-access (CDMA) is investigated. Each user is assumed to have a distinct set of spreading sequences, with a different spreading sequence for each carrier in each user's set. We show that when these sets of sequences are chosen to be the mutually orthogonal (MO) complementary sets of sequences, multiple-access interference is minimal on a nonfading channel. As a result of the autocorrelation sidelobe cancellation properties of the MO complementary sequences, it is possible to pack symbols more closely together on the nonfading channel, resulting in a higher data rate than in multicarrier CDMA using the same spreading sequence for each carrier. The resulting communication system scheme results in an easily parallelized receiver architecture that may be useful in nonfading coherent channels, such as the optical fiber channel or the Rician channel with a strong line-of-sight component. On the Rayleigh fading channel, the performance of the system is identical to that of multicarrier CDMA employing a single spreading sequence per user, with only a minimal increase in receiver complexity.