Complementary Coded Scrambling Multiple Access and Its Performance in Downlink MIMO Channels

In a traditional complementary coded CDMA (CC-CDMA) system, signals are spread using the direct sequence (DS) technique to suppress multipath interference (MI) and multiple access interference (MAI). However, DS spreading suffers from very poor bandwidth efficiency. This paper proposes a scrambling-...

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Bibliographic Details
Published inIEEE transactions on wireless communications Vol. 17; no. 2; pp. 835 - 847
Main Authors Liu, Xiqing, Syu, Hong-Ming, Chen, Hsiao-Hwa, Meng, Weixiao, Wei, Meng
Format Journal Article
LanguageEnglish
Published IEEE 01.02.2018
Subjects
CDMA
Complementary scrambling code
Frequency modulation
MIMO
Multiaccess communication
OFDM
scrambling modulation
Transmitting antennas
Wireless communication
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Summary:In a traditional complementary coded CDMA (CC-CDMA) system, signals are spread using the direct sequence (DS) technique to suppress multipath interference (MI) and multiple access interference (MAI). However, DS spreading suffers from very poor bandwidth efficiency. This paper proposes a scrambling-based CC-CDMA system, namely complementary coded scrambling multiple access (CCSMA). A CCSMA system offers a unified platform to integrate CC-CDMA, multiple-input multiple-output (MIMO), and scrambling technique seamlessly. Utilizing complementary codes in scrambling modulation, a CCSMA system is able to suppress MI and MAI effectively. With the help of space domain scrambling, the CCSMA system offers much higher bandwidth efficiency than a CC DS-CDMA system. Bit error rate and system capacity are evaluated explicitly in this paper, verifying that CCSMA is a viable multiple access technique for providing high capacity in downlink MIMO channels.
ISSN:1536-1276
DOI:10.1109/TWC.2017.2771780