Novel probabilistic bounds on power level profile of spectrally-encoded spread-time CDMA signals

Mashhadi, S ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1109/TWC.2009.081038
  3. Publisher: 2009
  4. Abstract:
  5. In this letter we introduce an effective tool to demonstrate signal power behavior of a typical spectrallyencoded spread-time (SE/ST) CDMA system using probabilistic approach. By denning power level profile (PLP), as the probability of stretching instantaneous power from a pre-specified threshold, we can find novel upper bounds on the signal power profile. We discuss various properties owing to PLP and elaborate on the main parameters affecting the PLP value. We present three theorems, propose some simple upper bounds on the PLP, and give an insight on the main contributions of the results. We introduce a fundamental parameter, namely β, as a key design parameter which relates the most important quantities affecting the PLP behavior. Finally, we propose a corollary demonstrating an approach to guarantee that the PLP value is set at zero. It is shown that using suitable distributions, we can also obtain some distribution gain, thereby enhancing the overall system performance. © 2009 IEEE
  6. Keywords:
  7. Code design ; CDMA signals ; CDMA system ; Code designs ; Effective tool ; Fundamental parameters ; Instantaneous power ; Key design parameters ; Main parameters ; PLP ; Power levels ; Probabilistic approaches ; Probabilistic bounds ; SE/ST CDMA ; Signal power ; Spread-time ; Upper Bound ; Design ; Code division multiple access
  8. Source: IEEE Transactions on Wireless Communications ; Volume 8, Issue 5 , 2009 , Pages 2296-2301 ; 15361276 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/4927442