Asynchronous multicarrier DS-CDMA using mutually orthogonal complementary sets of sequences

被引:96
|
作者
Tseng, SM [1 ]
Bell, MR
机构
[1] Chang Gung Univ, Dept Elect Engn, Tao Yuan, Taiwan
[2] Purdue Univ, Sch Elect Engn, W Lafayette, IN 47907 USA
关键词
code-division multiple access; complementary sequences; multicarrier modulation; multiple-access interference;
D O I
10.1109/26.818873
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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. iis 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.
引用
收藏
页码:53 / 59
页数:7
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