Adaptive code assignment algorithm for a multi-user/multi-rate CDMA system

Qiyue Yu, Fumiyuki Adachi, Weixiao Meng

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Code division multiple access (CDMA) technique is used widely since it can flexibly support multi-rate multi-media services by changing the number of orthogonal spreading codes. In this paper, we present a new adaptive code assignment algorithm, which consists of three steps: reserved-space, improved-crowded-first-space, and multi-code combination to fully use the code space. Compared with the existing algorithms, the proposed algorithm can avoid the code blocking problem and lower its total blocking probability while keeping its computational complexity relatively low. Simulation results show that increasing the free space reduces the average total blocking probability while increasing the blocking probability of high rate users.

Original languageEnglish
Pages (from-to)1600-1607
Number of pages8
JournalIEICE Transactions on Communications
Issue number5
Publication statusPublished - 2009 May


  • CDMA
  • Code assignment
  • Code tree
  • Cost function
  • DCA

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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