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      • HARVEST
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      A SPREADING FUNCTION FOR BAND LIMITED DIRECT-SEQUENCE SPREAD SPECTRUM CODE DIVISION MULTIPLE ACCESS SYSTEMS

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      Yu_Li_1994_sec.pdf (8.038Mb)
      Date
      1994-12
      Author
      Yu, Li
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      In a band limited direct-sequence (DS) spread-spectrum (SS) code division multiple access (CDMA) system, the signal to co-user noise ratio (SNR) is determined by the frequency responses of the transmit and receive band limiting filters and the spectral shape of the spreading function. To optimize the SNR, it is important that the transmit and receive filters be phase matched and the in-band portion of the spectrum of the spreading function be whitened by the magnitude responses. In practice, the tolerances of the electronic components in the transmit and receive filters make it difficult if not impossible to phase match the filters, especially in the wide band systems where digital signal processing can not be used to implement band limiting filters. This thesis suggests a method of generating a spreading function that has a flat portion in the mainlobe of its spectrum and reasonable sidelobe rolloff. Compared with a conventional binary PN code spreading function, such a spectrum of the proposed spreading function results in a larger SNR, at the same time it is more immune to phase mismatch in the transmit and receive filters. The proposed spreading function can also be incorporated in a practical system as it does not require four quadrant multipliers.
      Degree
      Master of Science (M.Sc.)
      Department
      Electrical and Computer Engineering
      Program
      Electrical Engineering
      Supervisor
      Salt, J. E.
      Copyright Date
      December 1994
      URI
      http://hdl.handle.net/10388/11854
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      • Graduate Theses and Dissertations
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