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Doubly spread DS-CDMA for efficient blind interference cancellation

Doubly spread DS-CDMA for efficient blind interference cancellation

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  • Author(s): T.F. Wong 1  and  T.M. Lok 2
    • View affiliations
    • Affiliations: 1: Department of Electrical and Computer Engineering, University of Florida, Gainesville, USA
      2: Department of Information Engineering, The Chinese University of Hong Kong, Hong Kong, People's Republic of China
  • Source: Volume 147, Issue 5, October 2000, p. 299 – 304
    DOI:  10.1049/ip-com:20000688 , Print ISSN 1350-2425, Online ISSN 1359-7019
© IEE
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A new spreading scheme, which consists of two stages of spreading, is considered for DS-CDMA systems. The data of a user is spread first with a long signature sequence and then with a short signature sequence. The scheme combines the advantages of the two types of spreading techniques and allows the suppression of MAI by performing both beamforming and multiuser detection efficiently. A joint receiver with blind multiuser detection and blind beamforming is proposed for the new spreading scheme. Simulations show that the joint receiver performs better than either beamforming or multiuser detection alone. To speed up convergence, an iterative version of the joint receiver is considered. A simple adaptive sequence design method is also included.

Inspec keywords: radio receivers; signal detection; multiuser channels; code division multiple access; spread spectrum communication; interference suppression; array signal processing

Other keywords: multiple access interference; DS-CDMA systems; doubly spread system; short signature sequence; spreading scheme; adaptive sequence design method; blind multiuser detection; long signature sequence; MAI suppression; blind beamforming; joint receiver; blind interference cancellation

Subjects: Electromagnetic compatibility and interference; Signal detection; Radio links and equipment; Multiple access communication

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