A comparison of system performance using two different chip pulses in multiple-chip-rate DS/CDMA systems

Young Woo Kim, Young Vin Kim, Jeong Ho Kim, Ho Shin Cho, Dan Keun Sung

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11 Scopus citations


This paper describes a comparison of system performance using two different chip waveforms of spreading sequences in multiple-chip-rate (MCR) direct-sequence (DS)/code-division multiple-access (CDMA) systems. The chip pulses used in this study are closely related to the characteristics of output filter employed at transmitter. In general, the chip waveform is an important factor to determine the link performance. The raised cosine chip pulse with a roll-off factor of α will be adopted for IMT-2000 systems in order to reduce both the intersymbol effect and the spectral width of the modulated signal. However, due to the complexity of obtaining quantitative results on the performance of MCR-DS/CDMA systems, rectangular chip pulses are mainly utilized in performance analysis. Therefore, it is necessary to investigate the effect of the chip pulses used, i.e., a rectangular and a raised cosine chip pulses on system performance in order to evaluate MCR-DS/CDMA systems accurately. Thus, the effect of the chip pulses used on the performance in MCR-DS/CDMA systems is investigated in terms of a system capacity and a blocking probability. It is shown that the system using a raised cosine chip pulse (i.e., RC system) supports at least 80% more capacity and 57% more traffic than that using a rectangular chip pulse (i.e., R system).

Original languageEnglish
Pages (from-to)1988-1996
Number of pages9
JournalIEEE Transactions on Communications
Issue number11
StatePublished - Nov 2001

Bibliographical note

Funding Information:
Paper approved by G. Cherubini, the Editor for CDMA Systems of the IEEE Communications Society. Manuscript received May 21, 1999; revised October 26, 1999 and May 11, 2000. This work was supported in part by the Korea Science and Engineering Foundation. Y. W. Kim is with Telson Electronics Company, Ltd., Seoul, Korea. Y. V. Kim is with LG Innotek Company, Ltd., Seoul, Korea (e-mail: yvkim@ lginnotek.com). J. H. Kim is with LG Electronics Company, Ltd., Seoul, Korea (e-mail: jeongh@lge.co.kr). H.-S. Cho is with the Hankuk Aviation University, Koyang, Korea (e-mail: hscho@mail.hangkong.ac.kr). D. K. Sung is with Korea Advanced Institute of Science and Technology, Taejon, Korea (e-mail: dksung@ee.kaist.ac.kr). Publisher Item Identifier S 0090-6778(01)10175-3.


  • Blocking probability
  • Capacity
  • Chip pulse
  • Multiple-chip-rate DS/CDMA


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