Performance of VSG-CDMA and MC-CDMA in multirate systems

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Abstract

In this paper, the performance of two multirate schemes in DS/CDMA systems: Variable Spreading Gain (VSG-CDMA) and Multicode (MC-CDMA) are compared. We will first present the signal model for multirate DS/CDMA system. Then, the performance in terms of asymptotic multiuser efficiency (AME), near-far resistance (NFR), and BER are evaluated. Some typical detectors are considered in multirate systems. These include the optimal Maximum-Likelihood detector, the sub-optimal linear detector, the interference canceller and the conventional MF detector. We will show that in multirate systems, MC-CDMA has a very similar performance as VSG-CDMA employing low-rate detection (LRD). But it performs much better than VSG-CDMA employing high-rate detection (HRD). Furthermore, we will show some important distinctions between multirate systems and single-rate systems.

Original languageEnglish
Pages (from-to)501-505
Number of pages5
JournalIEEE Vehicular Technology Conference
Volume1
Issue number53ND
Publication statusPublished - 2001
Externally publishedYes

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ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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