2-dimensional OVSF spread/chip-interleaved CDMA

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20 Citations (Scopus)


Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available time- and frequency-domain diversity gains. We present the code assignment for 2D spreading to provide users with flexible multi-rate data transmission. A computer simulation shows that by the joint use of 2D OVSF spreading and chip-interleaving, MAI-free transmission is possible for the quasi-synchronous DS- or MC-CDMA uplink, and hence the single-user frequency-domain equalization based on the MMSE criterion can be applied for signal detection. The BER performance in a time-and frequency-selective fading multiuser channel is theoretically analyzed and evaluated by both numerical computation and computer simulation.

Original languageEnglish
Pages (from-to)3363-3375
Number of pages13
JournalIEICE Transactions on Communications
Issue number12
Publication statusPublished - 2006 Dec


  • 2-dimensional OVSF spreading
  • CDMA
  • Chip interleaving
  • Multi-rate
  • Uplink transmission


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